ASE A6 PRO Electrical/Electronic Systems

An air bag system is being serviced, Technician A says to disconnect the yellow SRS connectors at the front of the vehicle. Technician B says to disconnect and isolate the negative battery cable. Who is right? A. Technician A only (B. Technician B only C. Both A and B D. Neither A or B

.B

Which of these should be used when soldering electrician wiring connections? (A. rosin core flux B. acid core flux C. sulfur core flux D. none of the above

.a

When testing computer-controlled systems, a digital multimeter should be used with an input impedance of at least: A. lOk ohms B. lOOk ohms C. 1 megohm (D. 10 megohms

.d

C- Both techs are right. Both an improperly rated flasher and an incorrect wattage bulb can cause the turn signals to flash at incorrect intervals

10. A vehicle's turn signals flash too slowly. tech A claims that the condition could be caused by a faulty flasher. Tech B says that a bulb may be the wrong type. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- Both techs are right. A short to ground has little or no resistance. Current flow increases as resistance decreases.

11. Tech A says a short circuit to ground in a circuit will decrease resistance. Tech B says a short circuit will increase current flow. Who is right? A. Tech A only B. tech B only C. Both A and B D. Neither A or B

A- A voltmeter should first be used to see if the circuit is getting power before doing further tests.

13. When using a voltmeter to check for voltage in a circuit, the voltmeter should first be connected to check for: A. Source voltage. B. excessive resistance C. excessive amperage. D. Good ground

A- if the so called Green eye is not visible, the green tip of the built in hydrometer is not floating high enough in the electrolyte to be visible. A fully charged battery will cause the built in hydrometer to float to the top of the electrolyte and allow the green tip of it to be seen.

14. When checking the green eye of a sealed maintenance free battery, no color seen indicates that the battery is: A. undercharged B. charged properly. C. Overcharged. D. Damaged.

D- neither tech is right. A poor headlight ground would cause both the high and low beam lights to be dim. A shorted headlight switch would only cause the headlights to operate incorrectly or not at all.

15. Both headlights on a vehicle are dim on high beam but are normal on low beam. Tech A says that a poor headlight ground could be the cause Tech B says that a shorted headlight switch could be the cause. Who is right? A. Tech A only B. Tech B only C. Both A and B D. neither A or B

A- since voltage is supplied to the indicator light when the ignition switch is on, the indicator light will normally light when the oil pressure switch supplies a ground to complete the circuit. if a short to ground occurs between the indicator light and the oil pressure switch, the light will be on whenever the ignition switch is in the ON position. An open switch prevent the light from coming on.

16. The oil pressure light on a vehicle dashboard stays on whenever the engine is running. The oil pressure has been checked with a mechanical gauge and it is within specs. Tech A says that the circuit between the indicator light and the pressure switch could be grounded. Tech B says that an open in the pressure switch itself could be the cause. Who is right? A. Tech A only B. tech B only C. Both A and B D. Neither A or B

D- Neither Tech is right. If a jumper wire is connected between the battery and the solenoid S terminal and the engine cranks, there is a problem in the starter control circuit. If the solenoid makes a clicking sound, it is operating properly and the problem may be with the starter. If no sound is heard, the solenoid is defective and should be replaced.

17. Nothing happens when the ignition key is turned to the START position in a vehicle with a good battery. Tech A says this if a clicking sound is heard when a jumper wire is connected between the battery and the solenoid "S" terminal, a problem exists in the starter control circuit. Tech B says that if a jumper wire is connected between the battery and the solenoid "S" terminal and there is no sound, the starter is defective. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- Both techs are right. A circuit breaker will disconnect the circuit if the circuit has a higher than normal current flow, which can be caused by a short in the circuit of a binding of the wiper linkage.

18. A vehicle continues to trip the windshield wiper circuit breaker. Tech A says the cause could be a short circuit. Tech B says that the cause could be binding wiper linkage. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- a battery with a 12.1 volt reading is undercharged. Tech B is wrong because if the indicator is yellow on a sealed maint free battery, it means that the fluid level is below the level of the hydrometer. The battery should not be charged and should be replaced.

19. Tech A says that a battery with an open circuit voltage of 12.1 Volts is fully charged. Tech B says that if the indicator on a sealed maintenance free battery is yellow, the battery should be charged. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

2 speed uses 3 contacts for high or low speed 3 speed uses resistors

2 speed vs 3 speed wiper motors

B- Always disconnect the ne the negative battery cable and wrap with tape so contract cannot be made. Follow the specific vehicle's disarming instructions, as some SRS system can retain back up power for an additional period of time.

2. An air bag system is being serviced. Tech A says to disconnect the yellow SRS connectors at the front of the vehicle. Tech B says to disconnect and isolate the negative battery cable. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

B- When performing a current draw test using an ammeter, a decrease in circuit resistance will cause a reading greater than what was specified.

20. When performing a current draw test using an ammeter, a reading greater than that which was specified would indicate: A. Excessive circuit resistance B. A decrease in Circuit resistance C. An open circuit D. a decrease in circuit voltage

D- neither tech is right. An analog meter with a low input resistance should only be used for non computer type circuits; a test light should never be used to diagnose sensor circuitry.

21. Tech A says that using a 20,000 ohm/volt analog meter is a good choice for ECM circuit testing. Tech B says that careful use of a test light can determine the condition of a Throttle position sensor. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- Neither Tech is right. The high rate discharge (load) test of a battery is frowned upon by OEMs because of the likely hood of overstressing the alternator. If done with the battery removed (or disconnected) from the vehicle, the load applied should be three times the battery's ampere-hour rating or half of its CCA rating

22. Tech A says that an in vehicle high rate discharge battery load test should always be performed if a 12 volt battery if its condition is in question. Tech B says that the battery should be discharged (loaded) at twice its ampere hour rating. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- Short light bulb life and a battery that continually needs water are indications of overcharging.

23. all of the following are indications of an undercharged battery condition except: A. Slow cranking B. Dim headlights C. short light bulb life D. Low ammeter indication

A- If the test light remains bright at both ends of the grid lines, check for a loose ground. If there is an open in a grid line, the test light will not get dimmer and will stay the same brilliance until it reaches the other side of the open, at which point it will go out.

26. A rear defogger grid is being tested. Tech a says that when probing a grid line, the voltmeter should decrease its reading as the probe gets closer to the ground bus bar. Tech B says that if voltmeter read 12 volts at both ends of the grid line, there is an open in the grid line. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- Charging system warning lights are controlled by charging voltage. The light bulb is not grounded at the instrument panel. Instead, current flows through the bulb and eventually grounds at the ground brush inside the alternator. When the alternator is charging, current through a wire to the opposite side of the bulb from the ignition switch. Because both sides of the bulb receive similar voltages, no current flows through the bulb and it doesn't light.

27. All of the following warning system lights use a grounding switch EXCEPT: A. oil pressure B. coolant temperature C. brake warning D. charging system

B- When using an ohmmeter, all power should be removed from the circuit to be tested. Power to the circuit is necessary when testing a circuit with an ammeter.

28. Tech A says that all power should be removed from a circuit before testing the circuit with an Ammeter. tech B says that all power should be removed from a circuit before testing the circuit with an ohmmeter. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

A- A diode is a semiconductor that permits the flow of electricity in only one direction. When checking a diode with an ohmmeter, put the probes with red on the N- side; black goes on the P -side. Read the resistance, then reverse the leads. The diode should have a high resistance in one direction only.

29. Tech A says that checked with an ohmmeter, a diode should have a high resistance in one direction only. Tech B says a diode permits the flow of electricity in both directions. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

A- for best results and less corrosion at the solder point, a rosin core flux should be used.

3. Which of these should be used when soldering electrical wiring connections? A. Rosin Core Flux B. Acid core Flux C. Sulfur Core Flux D. none of the above.

B- worn or missing fly wheel ring gear teeth may not enable the starter to crank the engine, but would not cause the starter itself to be inoperative. All of the other choices could prevent the starter from operating.

30. All of the following could cause an inoperative starter EXCEPT: A. An improperly adjusted neutral safety switch B. Worn or missing flywheel ring gear teeth C. an open circuit between the solenoid and the ignition switch D. An open in the solenoid ground circuit.

C- while a bad ground would disable the system or make the power seat operate slowly, it would not be the cause of noisy operation.

31. A power seat system is extremely noisy when operated. All of the following could be the cause EXCEPT: A. faulty motor B. faulty transmission C. bad ground D. lack of lubricant

C- air bag system wiring harnesses should not be repaired and only replaced. All of the other answers are true statements regarding air bag systems.

32. all of these are true statements regarding air bag supplemental restraint systems (SRS) EXCEPT: A. While removed from the vehicle, the airbag module should be stored with the cover pad facing up. B. safety glasses should be worn while servicing the air bag system. C. Only rosin core solder and heat shrink tubing should be used to repair air bag system wiring. D. Performing tests improperly or using the wrong equipment can result in accidental air bag deployment

B- the components of Ohm's Lay include Voltage (E), amperes (I) and ohms (R).

33. All of these are used when applying Ohm's law EXCEPT: A. amperes B. Watts C. Ohms D. voltage

B- the rectifier bridge changes AC voltage to DC voltage. To test an externally grounded alternator, make sure all lights and accessories are off. Set the engine RPM to 1500-2000, now ground the field according to the manufacturer's recommended procedure. Full amperage output should be indicated if the alternator is in good condition and being driven properly.

34. Tech A says that the rectifier bridge consisting of six diodes changes DC to AC voltage. Tech B says that an externally grounded alternator can be full fielded by grounding the field terminal. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- Neither tech is right. Total voltage in a series circuit is equal to the sum of the voltages across the separate resistances. Total current in a series circuit is the same throughout the circuit.

35. Tech A says that voltage in a series circuit should be the same at all loads of the circuit. Tech B says that current in a series circuit is the sum of all the components current draw in a circuit. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

A- 75 millivolts= 0.075 volts.

36. Another way of saying 75 millivolts is A. 0.075 volts B. 0.75 volts C. 7.5 volts D. 7.05 volts

C- A fuse normally blows because of high current draw. A typical cause for a blown fuse is a short circuit. A short may occur in the wiring or motor itself. If a window is binding in its track, the motor will tend to draw an excessive amount of current. this high current draw may cause the circuit to breaker to trip or a fuse to blow. The problem may also cause motor damage. An open circuit will draw zero current and therefore, would not be a cause for the blown fuse.

38. The fuse for a power window system is blown. Any of these could be the cause EXCEPT: A. wire is shorted to ground somewhere in the circuit. B. The window track is binding C. an open exists in the motors circuit. D. there is a short in the motor.

A- if horn sound is a weak tone, current is too low, and poor electrical connections may be the culprit. If a fuse is blown, the horn will not sound at all.

39. a horn makes a very weak sound. Tech A says a faulty power connection could be the cause. Tech B says a faulty fuse could be the cause. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- For maximum protection to the computer controlled system of any electronic circuit, it is best to use at least a 10 megohm impedance digital multimeter.

4. When testing computer controlled systems, a digital multi-meter should be used with an input impedance of at least: A. 10k ohms B. 100k ohms C. 1 megohm D.10 megohms

A- adding an additional path through which the current can flow has decreased the total resistance of the circuit. Each light drops 12 volts.

40. Two lights are connected in parallel. An additional light is added, also wired in parallel. Tech A says the total resistance will decrease. Tech B says the total Voltage will drop. Who is right? A. Tech A only B. tech B C. Both A and B D. Neither A or B

C- Both techs are right. An infinity reading indicates an open wire; a zero or low reading indicates a good connection.

41. an ohmmeter is being used to check a circuit for continuity. Tech A says an infinity or full scale reading on an ohmmeter indicates no continuity. Tech B says a zero reading on an ohmmeter indicates continuity. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

B- the headlight switch and breaker would also affect the high beams. The dimmer switch would affect both low beam headlights.

42. Neither of the low beam headlights on a vehicle will light but the high beams work normally. Tech A says the headlight thermal breaker could be faulty. Tech B says the dimmer switch may be faulty. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- neither tech is right. The flasher or fuses would affect both right and left sides. The most likely cause is two bad bulbs, a defective turn signal switch or a problem in the wiring that is common to the front and rear on the left side of the vehicle.

43. The front and rear turn signals on the left side of a vehicle are non- functional. Tech A says the turn signal flasher could be shorted to ground. Tech B says the hazard flasher could be shorted to ground. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- Both techs are right. Current remains constant throughout a circuit, and the total of all voltage drops always equals the source voltage provided.

44. A circuit is wired in series. Tech A says the total of all voltage drops will equal the battery voltage. Tech B says the current flow through each part of the circuit is the same. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- both techs are right, Current will be divided across the loads and the Voltage is the same at each load.

45. A circuit is wired in parallel. Tech A says that total circuit current is divided across each load. Tech B says the voltage is the same at each load. Who is right? A. Tech A only B. Tech B only C. both A and B D. Neither A or B

B- resetting circuit breakers are not used in taillight circuits. Fusible links are often identified by colored insulation- red, pink, brown, yellow, ect. The color indicates the amount of maximum circuit protection available.

47. Tech A says that a self resetting circuit breaker is sometimes used in a taillight circuit. Tech B says that the colored insulation of a fusible link indicates the amount of circuit protection available. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- neither tech is right. A test light may overload electrical circuits that contain solid state components. Because an ohmmeter has its own battery, any circuit being tested should be disconnected from its voltage source.

48. Tech A says that a test light is a good diagnostic tool for testing solid state electronic circuits. Tech B says that an ohmmeter is a good diagnostic tool for testing voltage sources. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- contrary to popular belief, the purpose of the soldering iron is not to melt the solder itself, but rather to heat the parts being soldered.

49. When performing soldering, the purpose of a soldering iron is to heat the: A. Flux B. Solder. C. Conductors D. heat shrink tubing.

B- always use an ammeter of a low amperage amp clamp with your DMM to troubleshoot a slow drain in an electrical circuit>

5. When troubleshooting a slow drain on the battery, which of these diagnostic tools should be used? A. Ohmeter B. ammeter C. voltmeter D. Test light

D- Neither tech is right. Tech A is wrong because digital ohmmeters do not need to be zeroed before use. Test lead continuity should be checked however, by touching the two ohmmeter leads together and watching for a servo reading on the meter. Tech B is wrong because an ohmmeter is used to check the resistance of a component or wire while there is no voltage applied to the circuit. Current flow from an outside voltage source, such as the vehicle battery, can damage the ohmmeter, so the circuit or component should be isolated from the vehicle electrical system before any testing is done.

50. Tech A says that a digital ohmmeter should be manually set to "zero" after the switch is turned on. Tech B says that the resistance of a component should be checked while voltage is applied to the circuit. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

B- A rheostat is a type of variable resistor that has two terminals. One terminal is connected to the fixed end of the resistor and the other is connected to a movable contact called a wiper. The resistance is varied by moving the position of the wiper on the resistor. thereby increasing or decreasing the electrical current. In a headlight switch, the knob is connected to the wiper and as the knob is turned, the instrument panel lights dim or brighten. The other type of variable resistor, the potentiometer, is a three terminal resistor. Potentiometers are commonly used in electronic engine control system sensors, such as the Throttle position sensor.

51. Which of the following parts are sometimes used in a headlight switch? A. Fixed type B. variable rheostate type C. Variable potentiometer type D. Thermistor

B- A door switch is a grounding switch that completes the courtesy light circuit when a door is opened. When a door is opened. When the door is closed, the switch opens and the interior lights go out. It is more likely that a door switch would stick in the open position, so Tech A is wrong. Tech B is right because a short to ground in the circuit before the door switch would complete the circuit, making the lights stay on regardless of switch position.

52. The interior lights in a vehicle stay on all the time. Tech A says that a door switch could be stuck. Tech B says there could be a short to ground in the circuit before one of the switches. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- both techs are right. Poor sound quality, static and poor reception can be caused by a defective antenna, and antenna that is not grounded or connected properly or one that is not trimmed properly. Static can also be caused faulty ignition components, loose or missing ground wires and defective noise suppression devices.

53. A customer complains of static on the radio. Tech A says that loose or missing ground wires could be the cause. Tech B says that a defective antenna cable could be the cause. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

B- the start/clutch interlock switch is open when the clutch pedal is in the released position, interrupting current flow in the starter circuit. Tech A is wrong because an open switch should have no continuity. When the clutch pedal is depressed, the switch closes, allowing current flow in the circuit.

54. A start/ Clutch interlock switch is being tested. Tech A says that, with the clutch pedal in the released position, the switch should have continuity when checked with an ohmmeter. Tech B says that, with the pedal depressed there should be voltage on both sides of the switch when checked with a voltmeter. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

A- An oscilloscope is especially useful for diagnosing intermittent problems that might not be detected with a voltmeter. An analog voltmeter only displays average values and digital voltmeter samples voltage several times each second, but because an oscilloscope displays actual voltage it will show any momentary changes in the signal. These momentary changes can be caused by an intermittent open in the circuit or an intermittent short to power or ground. A test light does not indicate that 12 volts(or any particular amount of voltage) are present; it only indicates that some voltage is present.

56. Which of these would be the MOST useful for diagnosing an intermittent electrical problem? A. Oscilloscope B. Digital Voltmeter C. analog voltmeter D. logic probe

C- A faulty passenger's door lock motor would only affect that door and would not prevent other doors from opening with the remote keyless entry. All of the other choices could prevent all the doors from opening using keyless entry.

57. the doors will not unlock on a vehicle using the remote keyless entry. Any of these could be the cause EXCEPT: A. a weak transmitter battery B. Interference from a stronger radio transmitter C. a bad passenger's door lock motor D. a blown circuit breaker

C- Both techs are right. The Body control module (BCM) in some systems can make diagnostic checks of the electronic instrument cluster. The BCM monitors certain functions and will store a DTC if any are found to be outside of preprogrammed parameters. If the instrument cluster passes a self diagnostic test but the speedometer still remains at a certain speed or operates erratically, the problem is most likely in the VSS circuit.

58. an electronic digital speedometer is stuck at zero. Tech A says that this could set a DTC. Tech B says that the vehicle speed sensor (VSS) could be the problem. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

B- A galvanometer is an analog type voltmeter. OEMs almost universally recommend the use of a non intrusive conductive capacitive type battery tester.

6. The condition of a lead-acid battery is being checked. Tech A says to use a galvanometer.. Tech B says to use a capacitive battery tester. A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- the onboard diagnostic system will set a code beginning with the letter U

61. A communications failure in the CAN system will set what type of DTC? A. B- Body B. C- Chassis C. P- Powertrain D. U- Network

What is the best course of action to be taken if a heated seat grid is found to be faulty? A. Send the seat to the dealer for needed electrical repairs. B. Take the seat apart and repair the defective heater grid. C. Replace the complete seat assembly with a new one. D. Send the seat to an automotive upholstery shop for repair.

D. The best course of action, unless a qualified upholstery technician is on staff, is to send the seat out for repair at an automotive upholstery shop. The special tools needed and the labor time involved would otherwise be prohibitive.

The front and rear turn signals on the left side of a vehicle are non-functional. Technician A says the turn signal flasher could be shorted to ground. Technician B says the hazard flasher could be shorted to ground. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. The flasher or fuses would affect both right and left sides. The most likely cause is two bad bulbs, a defective turn signal switch or a problem in the wiring that is common to the front and rear on the left side of the vehicle.

Technician A says that an in-vehicle high-rate discharge battery load test shouid always be performed if a 12-volt battery if its condition is in questlon. Technician B says that the battery should be discharged (loaded) at twice its ampere hour rating. Who Is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. The high-rate discharge (load) test of a battery. Is frowned upon by OEMs because of the likely hood of over stressing the alternator. If done with the battery removed (or disconnected) from the vehicle, the load applied should be three times the battery's ampere-hour rating or half of its CCA rating.

A communications failure in the CAN system will set what type of OTC? A. B - Body B. C - Chassis C. P - Powertrain D. U - Network

D. The onboard diagnostic system will set a code beginning with the letter U.

Technician A says that voltage in a series circuit should be the same at all loads of the circuit. Technician B says that current In a series circuit is the sum of all the components' current draw in a circuit. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. Total voltage in a series circuit is equal to the sum of the voltages across the separate resistances. Total current in a series circuit is the same throughout left sides.

lamp, ballast unit, and starter (igniter)

Each HID assembly includes

A coil of wire on an alternator rotor or starter motor frame that produces a magnetic field when energized

Field coils

A module that allows for data exchange between different buses. It translates a message on one bus and transfers that message to another bus without changing the message. The gateway interacts with each bus according to the protocol of that bus

Gateway

create light by creating and maintaining an electrical arc across two electrodes inside a bulb. The arc excites the gas and salts inside the bulb (Figure 20-11). This allows the arcing to continue to emit light. These lights are recognizable by their slightly bluish light beams

High-intensity discharge (HID) lamp or xenon headlamps create light by....

Positive post on battery and the second terminal on starter

How do you hook up a remote starter

a open on a auto range ohm meter or over the limit range on a manual voltage setting

OL on a test meter means

Should be done when battery has 15 min without load. Or should have a high load drawn if recently recharged for 15 seconds

Open circuit battery test precautions

perm magnet stepper motor

Quartz Analog Gauge uses 2 things differently

A type of A/D converter, where an analog signal is digitized and conditioned into a clean square wave

Schmitt trigger

Heavy jumper from positive battery terminal to starter s terminal

Starter relay bypass test is done by........

Closed

Starting safety switches are ( ) when in park or the clutch is depressed

A resistor or capacitor that is adjusted to meet the needs of a circuit.

Trimmers

130-250amps

What is normal cranking current test results

A series-parallel arrangement of resistors between an input terminal and ground.

Wheatstone bridge

test a batteries impedance

a didgetal battery tester would most likely be used to

(n)negitive type

a semi conductor is doped with impurities that create a excess of free electrons what type of semi conductor is it?

(p)ositive type

a semi conductor is doped with impurities that create a shortage of free electrons what type of semi conductor is it?

cause the gauge to read full all the time

a shorted to ground fuel sending unit will

a like a relay they both have coils but a soleinoid has a hard iron core that moves when coil is charged to do physical work. a linear motion

a solenoid is and is used for

6. Two technicians are discussing a battery's state of charge. Technician A says a specific gravity of 1.225 at 80F indicates that a battery's state of charge is approximately 75%. Technician B says you can use a hydrometer to check battery state of charge on a maintenance free battery. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

a. A only Technician A is correct and Technician B is wrong because maintenance free batteries do not have openings to check the specific gravity of the electrolyte with a hydrometer.

15. Technician A says an aiming screen will work on any headlight design to aim the headlights. Technician B says mechanical aimers are used on HID (High Intensity Discharge) headlights. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

a. A only Technician A is correct because the aiming screen is the tool of choice due to the many different headlight designs used. Technician B is wrong because mechanical aimers are no longer used and were never used on HID headlights.

changes analog to didgital

a/d converter

a type of barrety where fiberglass keeps the electrolite from moving preventing spills

absorbed glass mat (agm) battery

are brighter during hard breaking or abs

adaptive break lights

use steering and speed sensors to turn the light ahead of the car

adaptive head lights

a constantly variable distance lighting used to keep glare from other drivers.

adaptive high beam assist is?

there will be a dtc. it ussually means the camera needs to be reaimed

adaptive high beam assist warning bulb turns on

set dmm to ac volts black dmm lead to ground red dmm lead to altinator battery terminal. shouldnt be more than .5 volts

alternator diode check

set dmm to milli amps then connect in series from output terminal to ground should not be over .5 milli

alternator leakage test

bring rpm to 2000 then shut off engine yyou should hear a noise for up to 10 seconds

alternator pulley bearing check

the light it obsorbs raises the resistance enough to reach a preset amount

am electric photo cell triggers the headlight relay when....

tech a is correct tech be is wrong that would be a constant problem

an oil pressure gauge moves to the area above high. tech a says the pressure should be cheched with a manual gauge tech b says a open wire in the oil gauge could be the problem

the rotating part of the starter or alternator motor

armature

on off, bright dimming, aiming

automatic light systems can adjust what three things

1. When using a DMM (Digital Multimeter) voltmeter function to check for a voltage drop, meter leads should be connected in which of the following ways? a. On the "positive" side of the circuit b. Across the component or circuit c. To any non-conductive material d. In series with the circuit

b. Across the component or circuit Voltage is always checked in parallel or across the device or circuit.

11. Technician A says a loose serpentine alternator drive belt could cause overcharging. Technician B says undersized wiring between the alternator and the battery could cause undercharging. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

b. B only Technician A is wrong because a slipping belt will cause undercharging. Technician B is correct because undersize wiring will cause undercharging due to higher resistance.

8. Two technicians are discussing testing a battery using an electronic conductance or continuity tester. Technician A says some of these testers can load test a battery. Technician B says you need to make sure that the ignition switch and all accessories are off. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

b. B only Technician A is wrong because this device cannot apply a load. It checks battery conductance.

16. Which of the following describes the MOST common type of electrical wiring used in instrument lighting? a. Aluminum stranded type b. Copper stranded type c. Twisted pair type d. Solid copper type

b. Copper stranded type Copper stranded type electrical wiring is the correct answer because the other types are not common.

3. When a Digital Multimeter (DMM) is used to measure DC voltage and is connected in parallel to the load device, which of the following defines the reading? a. Amperage reading b. Voltage drop c. Voltage spike d. Pulse width modulation

b. Voltage drop Based on Kirchhoff's Voltage Law: Sum of voltage drops in any circuit will equal source VOLTAGE or VOLTAGE applied to circuit.

A type of gauge that utilizes coils to create magnetic fields instead of a permanent magnet.

balancing coil gauge

determines how well a battery performs under a load

battery load test

speed of comunication is equall to the number of bits per second

baud rate

current current

bipolar transistor varies ( ) to control overall ( ) flow

14. Technician A says you aim HID (High Intensity Discharge) headlights on a level floor with an unloaded vehicle. Technician B says when aiming any headlights, you must follow the state inspection specifications. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

c. Both A and B Both statements are correct

12. Technician A says high-intensity discharge (HID) headlights are generally brighter and have a blue tint. Technician B says a defective turn signal bulb on one side can cause the turn signal on that side not to blink. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

c. Both A and B Both statements are correct.

9. Two technicians are discussing an alternator with zero output. Technician A says the field circuit may have an open circuit. Technician B says the fusible link may be open from the battery to the alternator. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

c. Both A and B Both statements are correct.

4. Which of the following tools can be used to check the continuity of wires that carry digital signals? a. Megger Meter b. Analog meter c. Logic probe d. Voltmeter

c. Logic probe A logic probe is the only device that measures digital signals.

13. Which of the following is the LEAST likely cause of a dim headlight? a. Headlight connector corroded b. Damaged or broken headlight assembly c. Low alternator output d. High resistance in the headlight wiring

c. Low alternator output Low alternator output is the least likely cause. All of the other choices will cause a dim headlight.

10. This question is not like the ones above. It has the word LEAST. For this question, look for the choice that would LEAST LIKELY cause the described situation. Read the entire question carefully before choosing your answer. An alternator has low output and is being full-fielded to determine the cause. Which of the following is the LEAST likely result of full-fielding the alternator? a. High battery voltage level b. Battery gassing c. Low battery voltage level d. High alternator amperage output

c. Low battery voltage level Full fielding removes the regulator from controlling field current allowing the alternator to go to full output and is unlikely to produce a low battery voltage. This action normally produces high current and voltage. P (Power) = I (Current) x E (Voltage) and is least likely to occur.

7. When performing a load test on a battery, a technician finds that the battery voltage drops below specifications. Which of the following is the MOST likely action to perform? a. Recharge the battery and return it to service b. Recharge the battery and retest it c. Replace the battery d. Replace the voltage regulator

c. Replace the battery The battery was tested under load and failed.

17. What type of solder is required to repair the instrument panel wiring? a. Acid core b. 60/40 with no flux c. Rosin core d. 50/50 with acid paste flux

c. Rosin core Rosin core is the specified type of solder to use on any electrical repair to insure integrity.

19. If a fuel gauge reads full, which of the following is the MOST likely cause? a. A broken gauge b. Float stuck in the up position c. Wire to sending unit grounded d. An open fuse

c. Wire to sending unit grounded A wire to the sending unit being grounded is the most likely cause on most systems.

measures a batteries ability to store an electrical charge

capacitance test

A type of electric motor in which the field coils and armature are connected by series and shunt wiring. These motors combine the characteristics of good starting torque with constant speed.

compound motors

The sending unit is typically a negative temperature coefficient (NTC) thermistor. higher the temp the lower the resistance

coolant temp gauge function

5. Using a DMM (Digital Multimeter), a fully charged 12 volt battery should indicate how much voltage on the open circuit voltage (OCV) test? a. 9.6 volts b. 4 volts per cell c. 1 volt per cell d. 12.6 volts

d. 12.6 volts The standard is 2.1 volts per cell and 2.1 times 6 is 12.6 volts.

18. A dash indicator warning lamp does not light when the key is in the ON or START positions. What should you check first? a. Sending unit b. Wiring c. Battery level d. Bulb

d. Bulb Checking the bulb is the quickest and easiest thing to do.

2. Which of the following is correct regarding a series circuit? a. Highest resistance has most current b. Lowest resistance has most current c. Lowest resistance has highest voltage drop d. Highest resistance has highest voltage drop

d. Highest resistance has highest voltage drop Based on Kirchhoff's Voltage Law: Voltage higher before resistance than after, which is the result of total applied voltage not equal at both ends of a single load circuit. Resistance in circuit opposes electron flow with resulting voltage loss applied to load. The Loss is voltage drop with the voltage lost/consumed as current moves through resistance. HIGHER Resistance, HIGHER DROP.

A type of stator winding connection that connects three windings in series and has the appearance of the Greek letter delta. AC generators with delta windings are capable of putting out higher amperages.

delta winding

scan tool for dtcs and testing motor functions. disconnect the motor from the circuit to test ohms volt check sensors (if all checks pass its probably the sensor

diagnosing auto leveling head lights 3 parts

uses fiber optics to use one light for many lights

distributed lighting

An electrically erasable programmable read only memory chip.

eeprom

tech name for voltage

electromotive force (EMF)

An electrically erasable programmable read only memory chip. PROM que se puede borr

eprom

The circuit that is found in some hydraulic systems that allows limited operation when a component or components have failed.

fail safe circuits

The standard measure of capacitance. A one-farad capacitor can store one coulomb of charge at one volt.

farad

things blocking the sensors try setting it to on instead of auto

first two things to check if the auto headlight feature isnt working

power fuse control load ground

five basic parts of a circuit are

The conversion of the total AC voltage signal to a DC voltage signal. Rectificación de o

full wave rectification

use cameras computers and shutters to control exactly where light goes

glare free high beams

the convertion of half the ac voltage signal to dc

half wave rectification

produces dc voltage regulated by a shutter for more exact readings

hall-effect switch

leaving the lights on so you can walk to your house after shutoff

head light delay systems are for?

replace it the contacts have built up resistance and every time the ballast flickers it sends alot of amps and its hard on it

hid bulb flickering

i should be fine it can take up to 100 hours of operation before it turns blue

hid light colors if its not bright blue after replacement

putting a camera on the front of the rear view mirror. if it is dark enough it will turn on the brights

high beam detection is accomplished by

protection current control always on the base

how are resistors used with transistors?

set meter to expected range hit min/max first to engage the mode. then tap peak tap min max once for min once more for max

how do you use the dmm peak min max features?

check for voltage at the ballast.

if a hid lamp wont light what is the first step

anode to the cathode. or from positive to negitive

in a diode current flows from th( ) to the ( )

voltage voltage drops

in a parallel circuit all branches have the same ( ) and ( )

lower

in a parallel circuit resistance is always ( ) than the lowest resistor.

voltage that is produced by current flow in a wire without any contact to the wire

induced voltage

Used to stabilize and limit voltage for accurate instrument operation.

ivr

1000 or move decimal 3 places to the right

kilo or (k) stands for how many

100000 or move decimal 6 places to right

mega or "M" stands for how many

.000001 or move decimal 6 spaces to the left

micro (u) stands for how many

.001 or move decimal three spaces to the left

milli (m) stands for how many

A switch wired into the ignition switch to prevent engine cranking unless the transmission shift lever is in neutral.

neutral safety switch

bypass a load or sensor

never use a fused jumper wire to....

A basic law of electricity expressing the relationship between current, resistance, and voltage in any electrical circuit. It states that the voltage in the circuit is equal to the current

ohms law

voltage amps and resistance

ohms law E I R stand for what

divide volts by resistance

ohms law to determine amps....

divide volts by amps

ohms law to determine resistance......

multiply amps and ohms

ohms law to determine volts....

4 main ground and 5 signal ground

on a dlc what two pins are grounds

pin 16

on a dlc witch pin is power

A weak permanent magnet and wire assembly that in combination with a reluctor forms a position sensor.

pickup coil

A characteristic of something that changes resistances in relationship to changes in pressure.

piezoresistive

the smaller of two meshing gears

pinion gear (general)

A variable resistor that acts as a circuit divider to provide accurate voltage drop reading in response to the movement of an object. P

potentiometers

maintenance free gel type electrolyte

recombination battery

a variable resistor with two terminals used to regulate current

rheostats

The rotating or freewheeling portion of a clutch; the belt slides on the rotor. Rotor La

rotor

doping to change the amount of free electrons by adding impurities

semi conductors are setup to direct voltage by

the voltage reading returned to a computer after a sensor has modified it

sensing voltage

A type of electric motor in which the armature is wired in series with the field coils. These motors develop maximum torque at start-up and develop less torque as speed increases. Motor en ser

series motor

the rotor of an ac generator is fed through brushes that ride on two smooth rings, the slip rings mounted on the end of the rotor shaft

slip rings

An assembly is made up of heavy copper segments separated from each other and the armature shaft by insulation. Individual segments are connected to the individual windings in the armature. Brushes ride on the surface of the commutator

starter commutator

the coils on the altinator or starter frame. it produces a magnetic field when energized

starting motor field coils

the name used to describe a part in a torqu converter or the stationary windings of an AC generator

stator

a variable resistor that has fixed resistance values at specific points

stepped resistors

Resistors designed to have two or more fixed values, available by connecting wires to the several taps of the resistor Resistor con tomas Resistores dise

tapped resistor

circut breakers have a movable contact

tech a says circuit breakers are solid state devices tech b says some reset automatically

shorted sending wire senser grounds the connection to light up the bulb

temperature light stays on constantly can be caused by

stripe it will also be the direction current goes

the cathoide end of a diode is indicated by a

heat strip a open would stop everything

the heated seat only gets mildly warm could it be a open in the relay or pour connections at the heat strip

bulb they all share one ground

the left rear park light bulb is inoperative but the stop and turn lamp is working right. is the problem a faulty ground or bulb

the pcm

the voltage regulator is controlled by

carbon decrease

thermistors are made of ( ) and resistance ( ) at higher temperatures

A solid-state variable resistor made from semiconductor material that changes resistance in response to changes in temperature.

thirmister

A power system comprised of three conductors carrying voltage wave forms that are out of phase with each other. Normally the phase difference is 120 degrees.

three phase voltage

volt meter on bat and motor terminals and crank

to do a voltage on a starter solenoid

disconnect component from circuit and put leads in parallel

to test ohms

meter leads on s and m terminals

to test resistance on a started pull in winding

bipolar and unipolar (field effect transistors(fets))

transistors are divided into two catigories

voltage to control current

transistors fets vary ( ) to ( )

a way of charging a barrey ether constantly or intermitantly to keep it near full

trickle charginig

electrical pressure resulting from a differance in electrical potential

voltage

Sensors that are capable of producing their own input voltage signal. This varying voltage signal enables the computer to monitor and adjust for changes in the computerized control system

voltage-generating sensors

2 seconds for arc 30 for full illumination

what is a normal delay for a hid lamp?

it works like a ignition coil one set of windings discharge sending a wave of inductive energy to longer windings that multiply the voltage

what is a transformer and what does it do

12.4 volts or 75% charged

what is the min voltage a battery can have for a load test

a rheostat

what regulates the brightness of the dash lights

day time running lights.... led dtr use half of that

what type of head lights run on 6v

piezo resistor

what type of sending unit does a oil pressure gauge use

a rheostat or potentiometer

what type of sending unit does the fuel gauge use

thermistor

what type of sensor does a temperature gauge use?

a faulty lighting driver

what would cause a instrument cluster to intermittently go dim

wont allow current in ether direction

when a diode fails it.....

should read half of ref voltage when active.

when checking data bus traffic with dmm set to dc volts

inspect do not clean easy to damage

when dealing with the reflectors in headlights

when the load is higher than the charging system output

when does the charge light come on

reprogram the transmitters and put the module in program mode

when replacing the keyless entry control module you will have to do what to get it fully setup

broken park switch

window wipers only dont work in delay setting

potentiometer in the delay switch

window wipers only dont work in delay setting

the base

witch of the three sections of a transmitter controlls current flow

A type of stator winding connection that connects three windings in parallel and has the appearance of the letter "Y". AC generators with wye windings are capable of putting out higher voltages.

wye winding

C- Both techs are correct, worn alternator bearings and/or a bad alternator diode will cause the alternator to be noisy.

8. Tech A says that a noisy alternator could be caused by a bad diode. Tech B says that noisy alternator could be caused by a worn bearing. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

D- if the circuit is open, as in the rotor winding shown, the Ohmmeter will show infinite resistance or infinity, and the needle will not move.

9. The analog ohmmeter needle does not move when connected to both sides of the rotor. This means the rotor winding is? A. Shorted B. Grounded C. Complete D. Open

Another way of saying 75 millivolts is: A. 0.075 volts B, 0.75 volts C. 7.5 volts D. 7.05 volts

A. 75 millivolts = 0.075 volts.

Technician A says that checked with an ohmmeter, a diode should have a high resistance in one direction only. Technician B says a diode permits the flow of electricity in both directions. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

A. A diode is a semiconductor that permits the flow of electricity in only one direction. When checking a diode with an ohmmeter, put the probes with red on the N-side; black goes on the P-side. Read the resistance, then reverse the leads. The diode should have a high resistance in one direction only.

Two lights are connected in parallel. An additional light is added, also wired in parallel. Technician A says the total resistance will decrease. Technician B says the total voltage will drop. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

A. Adding an additional path through which the current can flow has decreased the total resistance of the circuit. Each light drops 12 volts.

Which of these would be the MOST useful for diagnosing an intermittent electrical problem? A. oscilloscope B. digital voltmeter C. analog voltmeter D. logic probe

A. An oscilloscope is especially useful for diagnosing intermittent problems that might not be detected with a voltmeter. An analog voltmeter only displays average values and a digital voltmeter samples voltage several times each second, but because an oscilloscope displays actual voltage it will show any momentary changes in the signal. These momentary changes can be caused by an intermittent open in the circuit or an intermittent short to power or ground. A test light does not indicate that 12 volts (or any particular amount of voltage) are present; it only indicates that some voltage is present.

The horns in the circuit shown above (pg 84) only blow when a jumper wire is connected between terminals 1 and 2 of the horn relay. Technician A says that a bad horn relay could be the cause. Technician B says that a ground in the circuit between the horn relay and the horn button could be the cause. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

A. Connecting a jumper wire between terminals 1 and 2 would bypass the relay and supply direct voltage from the battery to the horns, indicating a possible bad horn relay. If the circuit between the horn button and the horn relay were grounded, the horn relay would be energized and the horns would blow all the time.

All of these types of headlights are found on today's vehicle's EXCEPT for: A. conventional sealed beams headlamps. B. composite sealed beams headlamps. C. Xenon headlamps. D. LED headlamps.

A. Conventional sealed beams have all but been replaced by the other types of headlamps listed in this question

A horn makes a very weak sound. Technician A says a faulty power connection could be the cause. Technician B says a faulty fuse could be the cause. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

A. If horn sound is a weak tone, current is too low, and poor electrical connections may be the culprit, If a fuse is blown, the horn will not sound at all.

The next question refer to the interval windshield wiper/washer wiring schematic shown above. (pg 90) The wipers do not work in the interval position. Which of the following should the technician do first? A. Measure resistance at terminals Rl and R2. B. Replace the interval governor. C. Check the fuse. D. Check for an open circuit at S303.

A. If the fuse were bad, the wipers would not work at all, and the question states that they only don't work in the interval position. An open at S303 would affect the washer pump but not the wipers. The interval governor should not be condemned until the resistance is checked at terminals RI and R2 of the wiper switch. If the resistance doesn't vary when the interval adjustment is turned, the wiper switch should be replaced. If the interval adjustment varies the resiscance, the interval governor should be replaced.

A rear defogger grid is being tested. Technician A says that when probing a grid line, the voltmeter should decrease its reading as the probe gets closer to the ground bus bar. Technician B says that if voltmeter read 12 volts at both ends of the grid line, there is an open in the grid line. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

A. If the test light remains bright at both ends of the grid lines, check for a loose ground. If there is an open in a grid line, the test light will not get dimmer and will stay the same brilliance until it reaches the other side of the open, at which point it will go out.

When checking exterior LED fights on a vehicle, all of these can be checked EXCEPT: A. condition of filament. B. continuity C. power circuit D. ground circuit

A. LED lights have no filament, so a visual inspection will not determine whether the light is good, If an LED light assembly does not illuminate, check the light for an open circuit, inspect the wiring and make sure there is power to the light, just as you would for a conventional incandescent light.

A control device that delivers mechanical action in response to an electrical signal.

Actuator

The rating that is based on the total number of amperes the battery can supply in a 20-hour period at a fixed rate of discharge. If a battery is rated at 200 ampere/hours, it can supply 10 amperes per hour for 20 hours

Ampere-hour (AH) rating

The fault shown in the above circuit is: (pg. 81) A. an open (B. a short to ground C. too much capacitance D. too much resistance

B.

Which of these is best to use for testing networked components for proper operation when a vehicle is not actually being driven on the road? A. A jumper wire B. A bi-directional scan tool C. A digital volt-ohm meter D. A backprobe device

B. A bi-directional scan tool can be used to command on-board actuators to perform their duty when the vehicle is either in for service, or when it can be safely done while the vehicle is on the road.

The Interior lights in a vehicle stay on all the time. Technician A says that a door switch could be stuck. Technician B says there could be a short to ground in the circuit before one of the switches. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. A door switch is a grounding switch that completes the courtesy light circuit when a door is opened. When the door is closed, the switch opens and the interior lights go out. It is more likely that a door switch would stick in the open position, so Technician A is wrong. Technician B is right because a short to ground in the circuit before the door switch would complete the circuit, making the lights stay on regardless of switch position.

Which of the parts schematically shown above (pg 88) is sometimes used in a headlight switch? A. fixed type B. variable rheostat type C. variable potentiometer type D. thermistor

B. A rheostat is a type of variable resistor that has two terminals. One terminal is connected to the fixed end of the resistor and the other is connected to a movable contact called a wiper. The resistance Is varied by moving the position of the wiper on the resistor, thereby increasing or decreasing the electrical current. In a headlight switch, the knob is connected to the wiper and as the knob is turned, the instrument panel lights dim or brighten. The other type of variable resistor, the potentiometer, is a three-terminal resistor. Potentiometers are communal used in electronic engine control system sensors, such as the Throttle Position (TP) sensor.

All of the gauges on a vehicle work except the coolant temperature gauge. A variable resistor is connected between the sending unit wire and ground. With the Ignition switch ON the resistance is varied, making the gauge needle move. Technician A says the instrument voltage regulator could be the cause. Technician B says the sending unit could be faulty. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. If all the gauges were dead, then the cause would probably be the instrument voltage regulator. However, only the temperature gauge is inoperative. The gauge was tested properly in the question so a faulty sending unit is indicated. The resistance of the sending unit can be checked by connecting an ohmmeter between the terminal lead and ground. The resistance value should change in proportion to the coolant temperature. Compare results with the manufacturer's specifications.

Neither of the low beam headlights on a vehicle will light but the high beams work normally. Technician A says the headlight thermal breaker could be faulty..Technician B says the dimmer switch may be faulty. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. The headlight switch and breaker would also affect the high beams. The dimmer switch would affect both low beam headlights.

Technician A says that the rectifier bridge consisting of six diodes changes DC to AC voltage. Technician B says that an externally grounded alternator can be full-fielded by grounding the field terminal. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. The rectifier bridge changes AC voltage to DC voltage. To test an externally grounded alternator, make sure all lights and accessories are off. Set the engine rpm to 1500-2000 rpm. Now ground the field according to the manufacturer's recommended procedure. Full amperage output should be indicated if the alternator is in good condition and being driven properly.

A start/clutch interlock switch is being tested. Technician A says that, with the clutch pedal in the released position, the switch should have continuity when checked with an ohmmeter. Technician B says that, with the pedal depressed, there should be voltage on both sides of the switch when checked with a voltmeter. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. The start/clutch interlock switch is open when the dutch pedal is in the released position, interrupting current flow in the starter circuit. Technician A is wrong because an open switch should have no continuity. When the clutch pedal is depressed, the switch closes, allowing current flow in the circuit.

When checking a vehicle for DTCs, code U1064 is found: Loss of Communication with BCM. Technician A says that the BCM should be replaced. Technician B says the cause for the OTC could be another module in the network. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. This code does not necessarily mean that the module has failed, but rather that there is a problem preventing communication. A communications DTC can be caused by a faulty connector or wiring, an open or short circuit, a voltage problem on the network, another module in the network, or the module itself.

When performing a current draw test using an ammeter, a reading greater than that which was specified would indicate: A. excessive circuit resistance B. a decrease in olrcult resistance C. an open circuit D. a decrease in circuit voltage

B. When performing a current draw test using an ammeter, a decrease in circuit resistance will cause a reading greater than what was specified.

Technician A says that all power should be removed from a circuit before testing the circuit with an ammeter. Technician B says that ail power should be removed from a circuit before testing the circuit with an ohmmeter. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. When using an ohmmeter, all power should be removed from the circuit to be tested. Power to the circuit is necessary when testing a circuit with an ammeter.

All of the following could cause an inoperative starter EXCEPT: A. an improperly adjusted neutral safety switch B. worn or missing flywheel ring gear teeth C. an open circuit between the solenoid and the ignition switch D. an open in the solenoid ground circuit

B. Worn or missing fly-wheel ring gear teeth may not enable the starter to crank the engine, hut would not cause the starter itself to be inoperative. All of the other choices could prevent the starter from operating.

Done at half batteries cca for 15 seconds. Should stay above 10.5v

Battery load test

Bi-xenon lights rely on a stepper motor or solenoid controlled shield plate, or shutter, that physically obstructs a portion of the overall light beam emitted by the arc. When the driver selects high beams, the shutter reacts and allows the headlights to project the complete, unobstructed light beam.

Bi-Xenon Lights

In the schematic shown above (pg 91), only the console and the radio are illuminated when the lights are turned on. Which of these could be the cause? A. A blown five amp fuse B. A faulty connection at C216 C. A loose connection at G1002 D. A faulty connection at C504

C. A blown fuse or a faulty connection at C216 would prevent all the lights from working. A poor connection at C504 would prevent the radio light from working and we know from the question that it works. The radio is case grounded and the console light also has a separate ground. However, all the other lights share the G1002 ground and a poor connection there could cause an open circuit and keep those lights from working.

A vehicle continues to trip the windshield wiper circuit breaker. Technician A says the cause could be a short circuit Technician B says that the cause could be binding wiper linkage. Who is right? A. Technician A only B. Teohnician B only C. Both A and B D. Neither A or B

C. A circuit breaker will disconnect the circuit if the circuit has higher than normal current flow, which can be caused by a short in the circuit or a binding of the wiper linkage.

The doors will not unlock on a vehicle using the remote keyless entry. Any of these could be the cause EXCEPT: A. a weak transmitter battery B. interference from a stronger radio transmitter C. a bad passenger's door lock motor D. a blown circuit breaker

C. A faulty passenger's door lock motor would only affect that door and would not prevent other doors from opening with the remote keyless entry. All of the other choices could prevent all the doors from opening using keyless entry.

The fuse for a power window system is blown. Any of these could be the cause EXCEPT: A. wire is shorted to ground somewhere in the circuit. B. the window track is binding. C. an open lexists in the motor's circuit. D. there is a short in the motor.

C. A fuse normally blows because of high current draw. A typical cause for a blown fuse is a short circuit. A short may occur in the wiring or motor itself. If a window is binding in its track, the motor will tend to draw an excessive amount of current. This high current draw may cause the circuit breaker to trip or a fuse to blow. The problem may also cause motor damage. An open circuit will draw zero current and therefore, would not be a cause for the blown fuse.

The charging system on a vehicle undercharges. Technician A says the cause could be a loose alternator drive belt. Technician B says the cause could be a defective ECM. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. A loose alternator drive belt could cause reduced charging system output voltage, but on some vehicles, so could a defective ECM. The PCM/ECM regulates alternator output voltage on many newer vehicles, The PCM/ECM either supplies power or ground to the alternator field, depending on the system. The power or ground is pulse-width modulated in response to the amount of sensing voltage.

All of these are true statements regarding air bag supplemental restraint systems (SRS) EXCEPT: A. While removed from the vehicle, the airbag module should be stored with the cover pad facing up. B, Safety glasses should be worn when servicing the air bag system. C. Only rosin core solder and heat shrink tubing should be used to repair air bag system wiring. D. Performing tests Improperly or using the wrong equipment can result In accidental air bag deployment.

C. Air bag system wiring harnesses should not be repaired and only replaced. All of the other answers are true statements regarding air bag systems.

An ohmmeter is being used to check a circuit for continuity. Technician A says an infinity or full scale reading on an ohmmeter indicates no continuity. Technician B says a zero reading on an ohmmeter indicates continuity. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. An infinity reading indicates an open wire; a zero or low reading indicates a good connection.

When performing soldering, the purpose of a soldering iron is to heat the: A. flux. B. solder. C. conductors. D. heat shrink tubing.

C. Contrary to popular belief, the purpose of the soldering iron is not to melt the solder itself, but rather to heat the parts being soldered.

A circuit is wired in series. Technician A says the total of all voltage drops will equal the battery voltage. Technician B says the current flow through each part of the circuit Is the same. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. Current remains constant throughout a circuit, and the total of all voltage drops always equals the source voltage provided.

A circuit is wired in parallel. Technician A says that total circuit current is divided across each load. Technician B says the voltage is the same at each load. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. Current will be divided across the loads and the voltage is the same at each load.

In the charging system shown above, the reading will show: (pg 84) A. charging output voltage B. indicator lamp operating voltage C. charging circuit voltage drop D. ignition switch voltage

C. In the circuit shown in the illustration, the meter will show the charging circuit voltage drop from the alternator BAT terminal to the wire terminal or bus, to the positive battery post.

The sunroof on a vehicle works intermittently. Technician A says there could be a poor wiring connection. Technician B says the panel could be binding in the rails. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. Loose or corroded connections could cause an intermittent problem. The glass binding in the rails could cause the electric motor to overheat and trip the circuit breaker. After the breaker cools and resets, the panel may work again until the binding again trips the breaker.

A customer complains of static on the radio. Technician A says that loose or missing ground wires could be the cause. Technician B says that a defective antenna cable could be the cause. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. Poor sound quality, static and poor reception can be caused by a defective antenna, an antenna that is not grounded or connected properly or one that is not trimmed properly. Static can also be caused by faulty ignition components, loose or missing ground wires and defective noise suppression devices.

All of the following are indications of an under-charged battery condition EXCEPT: A. slow cranking B. dim headlights C. short light bulb fife D. low ammeter indication

C. Short light bulb life and a battery that continually needs water ar indications of over charging.

An electronic digital speedometer is stuck at zero. Technician A says that this could set a OTC. Technician B says that the Vehicle Speed Sensor (VSS) could be the problem. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

C. The Body Control Module (BCM) in some systems can make diagnostic checks of the electronic instrument duster. The BCM monitors certain functions and will store a DTC if any are found to be outside of preprogrammed parameters. If the instrument duster passes a self-diagnostic test but the speedometer still remains at a certain speed or operates erratically, the problem is most likely in the VSS circuit.

The wiring diagram symbol shown represents a: (pg 89) A. fuse B. circuit breaker C. relay D. switch

C. The symbol shown represents a relay.

A power seat system is extremely noisy when operated. All of the following could be the cause EXCEPT a: A. faulty motor B. faulty transmission C. bad ground D. lack of lubricant

C. While a bad ground would disable the system or make the power seat operate slowly, it would not be the cause of noisy operation.

A special diode used to prevent voltage spikes. It is typically installed in parallel to a coil, creating a bypass for the electrons during the time the circuit is opened.

Clamping diode

Positive lead to m terminal negative to chassis ground should be at least 9.6v

Cranking voltage test

Technician A says that a battery with an open circuit voltage of 12.1 volts Is fully charged. Technician B says that if the Indlcator on a sealed maintenance-free battery Is yellow, the battery shouid be charged. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. A battery with a 12.1 volt reading is undercharged. Technician B is wrong because if the indicator is yellow on a sealed maintenance-free battery, it means that the fluid level is below the level of the hydrometer. The battery should not be charged and should be replaced.

Technician A says that a test tight is a good diagnostic tool for testing solid-state electronic circuits. Technician B says that an ohmmeter is a good diagnostic tool for testing voltage sources. Who is right? A. Technician A only B. Technlcian B only C. Both A and B D. Neither A or B

D. A test light may overload electrical circuits that contain solid-state components. Because an ohmmeter has its own battery, any circuit being tested should be disconnected from its voltage source.

Technician A says that using a 20,000 ohm/volt analog meter ts a good choice for ECM clroult testing. Technician B says that oarefui use of a test light can determine the condition of a Throttle Position (TP) sensor. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. An analog meter with a low input resistance should only be usedfor non-computer type circuits; a test light should never be used to diagnose sensor circuitry.

The next question refer to the interval windshield wiper/washer wiring schematic shown above. (pg 90) The wipers only work on high speed. All of the following could be the cause EXCEPT: A. a defective wiper switch B. a loose connection at G1002 C. a defective interval governor D. an open in the DB/O wire

D. An open in the DB/O wire would prevent high-speed operation and the question states that the wipers only work on high. A bad governor ground could prevent low and interval operation so a loose connection at G1002 could be the cause. No voltage ac terminals L and I of the main switch could mean that the switch is faulty. However, if there is voltage at terntinals L and I and wires 65 and 993 are OK, the governor should be replaced.

The backup lights in the circuit shown above right do not work. (pg 88) Which of these is the MOST LIKELY cause? A. a corroded connector C402 B. a break in the black wire between connector C400 and splice S404 C. both backup light bulbs are burned out D. the backup light switch is faulty

D. Answers A and B are wrong because either problem would only affect one light and the question states that both lights do not work. Answer C is possible but it is not probable that both bulbs burned out at the same time. A faulty switch would affect both backup lights and is the most likely cause for failure of the choices given.

All of the following warning system lights use a grounding switch EXCEPT: A. oil pressure B. coolant temperature C. brake warning D. charging system

D. Charging system warning lights are controlled by charging voltage. The light bulb is not grounded at the instrument panel. Instead, current flows through the bulb and eventually grounds at the ground brush inside the alternator. When the alternator is charging, current flows through a wire to the opposite side of the bulb from the ignition switch. Because both sides of the bulb receive similar voltages, no current flows through the bulb and it doesn't light.

Nothing happens when the ignition key Is turned to the START posltion In a vehicle with a good battery. Teohnician A says that If a clicking sound is heard when a jumper wire is 'connected between the battery and the solenoid 'S' terminal, a problem exists in the starter control circuit. Technician B says that if a jumper wire is connected between the battery and the soienold 'S' terminal and there Is no sound, the starter Is defective. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. If a jumper wire is connected between the battery and the solenoid 'S' terminal and the engine cranks, there is a problem in the starter control circuit. If the solenoid makes a clicking sound, it Is operating properly and the problem may be with the starter. If no sound is heard, the solenoid is defective and should be replaced.

The left power window in the illustration above (pg 86) operates in the UP position, but not in the DOWN position. The right power window operates in both UP and DOWN positions. Technician A says that the BRN wire is open. Technician B says that the DK BLU wire is open. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. If the BRN wire is open, the left window would not have a return or ground wire in the UP position and would not have a supply or voltage wire in the DOWN position. If the DRK BLU wire is open, the left window would not have a return or ground wire in the DOWN position and would not have a supply or voltage wire in the UP position. A possible bad switch LH WINDOW UP contact in the Master Switch Assembly would cause the problem.

Which of these is most useful for first diagnosing vehicles with multiplex (networked) electrical systems? A. A voltmeter B. An oscilloscope C. A logic probe D. A scan tool

D. Multiplexed networks can be monitored and tested using an OEM or equivalent scan tool.

In the test shown above (pg 89), the voltmeter reads 0.3volts. Technician A says this indicates there is excessive resistance in the starter power circuit. Technician B says this indicates there is excessive resistance in the starter ground circuit. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. Technician A is wrong because 0.3 volts is within specification for voltage drop in a starter power circuit. Technician B is wrong because the starter ground circuit is not being tested in the illustration.

Technician A says that a digital ohmmeter should be manually set to "zero" after the switch is turned on. Technician B says that the resistance of a component should be checked while voltage is applied to the circuit. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

D. Technician A is wrong because digital ohmmeters do not need to be zeroed before use. Test lead continuity should be checked however, by touching the two ohmmeter leads together and watching for a zero reading on the meter. Technician B is wrong because an ohmmeter is used to check the resistance of a component or wire while there is no voltage applied to the circuit. Current flow from an outside voltage source,such as the vehicle battery, can damage the ohmmeter, so the circuit or component should be isolated from the vehicle electrical system before any testing is done.

B- if there were an open ground circuit or the bulb was bad, the light would not work at all. Since the bulb is working, but not optimally, the tech is voltage drop testing. It the circuit was operating properly, the voltmeter reading would be 0.0 volts and no higher than 0.5 volts. This would mean that all the system voltage was being used by the light. The reading of 6.2 volts means that there is excessive resistance in the circuit, robbing the light of the necessary voltage needed for optimal illumination. The tech should continue checking the ground path until the voltmeter reading returns to normal and repair the problem connection.

62. the brake light on the right side of a vehicle is dim compared with the one on the left. A tech tests the circuit with a voltmeter. With the brake pedal applied, the voltmeter negative lead connected to the negative battery terminal and the positive lead connected to the light socket, the voltmeter reading is 6.2 volts. What does the voltmeter reading indicate? A. an open ground circuit B. high resistance in the ground circuit C. low resistance in the ground circuit D. a bad light bulb

C- both techs are right. Loose or corroded connections could cause an intermittent problem. The glass Binding in the rails could cause the electric motor to overheat and trip the circuit breaker. After the breaker cools and resets, the panel may work again until the binding again trips the breaker.

63. the sunroof on a vehicle works intermittently. Tech A says there could be a poor wiring connection. Tech B says the panel could be binding in the rails. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

C- Both techs are right. A loose alternator drive belt could cause reduced charging system output voltage, but on some vehicles, so could a defective ECM. The PCM/ECM regulates alternator output voltage on many newer vehicles. The PCM/ECM either supplies power or ground to the alternator field, depending on the system. The power or ground is pulse width modulated in response to the amount of sensing voltage.

64. The charging system on a vehicle undercharges. Tech A says the cause could be a loose alternator drive belt. Tech B says the cause could be a defective ECM. who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

B- this code does not necessarily mean that the module has failed, but rather that there is a problem preventing communication. A communications DTC can be caused by a faulty connector or wiring, an open or short circuit, a voltage problem on the network, another module in the network, or the module itself.

67. When checking a vehicle for DTC's, code U1064 is found: loss of communication with BCM. Tech A says that the BCM should be replaced. Tech B says the cause for the DTC could be another module in the network. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

A- LED lights have no filament, so a visual inspection will not determine whether the light is good. If an LED light assembly does not illuminate, check the light for an open circuit, inspect the wiring and make sure there is power to the light, just as you would for a conventional incandescent light.

69. When checking exterior LED lights on a vehicle, all of these can be checked EXCEPT: A. Condition of filament B. continuity C. power circuit D. Ground circuit

A- if an engine cranks slowly and the starter current draw is only 90 amps and the voltage is as high as 11 volts, the tech should next check for excessive voltage drop in the starter motor circuit.

7. While testing a starting circuit on a 5.7 V8 engine, the Tech finds that the engine cranks slowly. The starter current draw is 90 amps, and the battery voltage while cranking is 11 volts. What should the Tech Do next? A. Check for voltage drop of the starter motor circuit. B. Test the battery capacity. C. Replace the starter motor, as a short is indicated. D. Determine the condition of the engine.

B- if all the gauges were dead, then the cause would probably be the instrument voltage regulator. However, only the temperature gauge is inoperative. The gauge was tested properly in the question so a faulty sending unit is indicated. The resistance of the sending unit can be checked by connecting an ohmmeter between the terminal lead and Ground. The resistance value should change in proportion to the coolant temperature. Compare results with the manufacturer's specs.

70. All of the gauges work on a vehicle except the coolant temperature gauge. A variable resistor is connected between the sending unit wire and ground. With the ignition switch ON the resistance is varied, making the gauge needle move. Tech A says the instrument voltage regulator could be the cause> Tech B says the sending unit could be faulty. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B

A- conventional sealed beams have all but been replaced by the other Types of headlamps listed in this question.

71. all of these types of headlights are found on todays vehicles EXCEPT for: A. Conventional sealed beam headlamps. B. Composite sealed beams headlamps. C. Xenon headlamps. D. LED headlamps.

D- multiplexed networks can be monitored and tested using an OEM or equivalent scan tool.

72. Which of these is most useful for first diagnosing vehicles with multiplex (networked) electrical systems? A. A voltmeter B. an oscilloscope C. A logic probe D. a scan tool

B- a bi directional scan tool can be used to command on board actuators to perform their duty when the vehicle is either in for service, or when it can be safely done while the vehicle is on the road.

73. Which of these is best to use for testing networked components for proper operation when a vehicle is not actually being driven on the road? A. A jumper wire B. A bi directional scan tool C. A digital volt-ohm meter D. A backprobe device.

D- the best course of action unless a qualified upholstery tech is on staff, is to send the seat out for repair at an automotive upholstery shop. The special tools needed and the labor time involved would otherwise be prohibitive.

74. What is the best course of action to be taken if a heated seat grid is found to be faulty? A. send the seat to the dealer for needed electrical repairs. B. Take the seat apart and repair the defective heater grid. C. Replace the complete seat assembly with a new one. D. send the seat to an automotive upholstery shop for repair.

B- MUX stand for multiplex, which is the basis of operation for the type of communication system used in network equipped vehicles.

75. what is meant by the term MUX? A. Multiphase switch B. Multiplexed network C. Micro unitized assembly D. magnetic unit injector

The brake light on the right side of a vehicle is dim compared with the one on the left. A technician tests the circuit with a voltmeter. With the brake pedal applied, the voltmeter negative lead connected to the negative battery terminal and the positive lead connected to the light socket, the voltmeter reading is 6.2volts. What does the voltmeter reading indicate? A. an open ground circuit B. high resistance in the ground circuit C. low resistance in the ground circuit D. a bad light bulb

B. If there were an open ground circuit or the bulb was bad, the light would not work at all. Since the bulb is working, but not optimally, the technician is voltage drop testing. If the circuit was operating properly, the voltmeter reading would be 0.0 volts and no higher than 0.5 volts. This would mean that all the system voltage was being used by the light. The reading of 6.2 volts means that there is excessive resistance in the circuit, robbing the light of the necessary voltage needed for optimal illumination. The technician should continue checking the ground path until the voltmeter reading returns to normal and repair the problem connection.

What is meant by the term MUX? A. Multiphase switch B. Multiplexed network C. Micro-unitized assembly D. Magnetic unit-injector

B. MUX stands for "multiplex", which is the basis of operation for the type of communication system used in network equipped vehicles.

Technician A says that a self-resetting circuit breaker is sometimes used in a taillight circuit. Technician B says that the colored insulation of a fusible link indicates the amount of circuit protection available. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. Resetting circuit breakers are not used in taillight circuits. Fusible links arc often identified by colored insulation-red, pink, brown, yellow, etc. The color indicates the amount of maximum circuit protection available.

Technician A says that if the washer pump ground circuit (as shown above, pg 87) is faulty, the wiper motor will not run. Technician B says that the wiper motor shown will continue to run after the switch is opened until the park switch also opens. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B

B. Tech A states that a bad washer motor ground will prevent the wiper motor from working. This is wrong. The washer motor ground serves as a ground for the washer motor and would not affect the action of the wiper motor. Tech B explains the wiper motor park circuit shown in the illustration. The wiper motor will continue to run after the switch is opened until the cam opens the park switch.

All of these are used when applying Ohm's Law EXCEPT: A. amperes (i) B. watts (W) C. ohms CR) D. voltage CE)

B. The components of Ohm's Law include voltage (E), amperes (I) and ohms (R). t