EES

The low-speed position of the windshield wiper system in the figure does not work but the washer pump works normally. Technician A says circuit 58 may be open. Technician B says circuit 63 may be open at the fuse. Who is correct?

A only

The medium/high speed of the blower motor circuit in the figure is inoperative; the rest of the blower speeds are fine. Technician A says circuit 752 may be open. Technician B says the middle resistor in the blower motor resistor assembly may be open. Who is correct?

A only

The right back-up light circuit is grounded on the switch side of the bulb in the figure. Technician A says this condition may cause the back-up light fuse to fail. Technician B says the left back-up light may work normally while the right back-up light is inoperative. Who is correct?

A only

While testing a battery, a buildup of dirt and corrosion on the battery case, hold-downs, and terminals is quite evident. Technician A says this could cause battery drain. Technician B says the battery must be leaking and should be replaced. Who is correct?

A only

A vehicle with a data bus communication problem is being diagnosed. Technician A says that the owner will not likely notice any unusual problems if the data bus wires become shorted together. Technician B says data bus communication happens when voltage pulses are sent from module to module thousands of times per second. Who is correct?

B only

Charging system voltage is being measured in two places. With the voltmeter's leads across the battery, a 12.8-volt reading is observed. Connecting the voltmeter to the generator output terminal and the case results in a 14.2-volt reading. Technician A says there may be excessive resistance on the ground side of the charging system. Technician B says there may be excessive resistance on the positive side of the charging system. Who is correct?

B only

The circuit breaker in the power seat circuit opens and closes continually without touching the seat control buttons. Technician A says something stored under the seat might be jammed in the seat tracks. Technician B says there might be a grounded wire between the circuit breaker and the seat switches. Who is correct?

B only

The circuit breaker that protects an electric window circuit opens whenever an attempt is made to lower the window. Technician A says the internal resistance of the motor is too high. Technician B says the window regulator may be sticking. Who is correct?

B only

The instrument cluster bulbs are completely inoperative. Technician A says one of the instrument cluster bulbs might have an open circuit. Technician B says the rheostat in the headlight switch might have an open circuit. Who is correct?

B only

The right hand turn signals operate normally and the left hand turn signals flash rapidly. Technician A says there might be a grounded wire between the signal light switch and the right front signal light. Technician B says there might be high resistance between the left front signal light and ground. Who is correct?

B only

The temperature gauge in the figure provides a continual low reading with the engine at normal operating temperature. Technician A says the wire might be grounded between the gauge and the temperature sending unit. Technician B says the wire from the temperature gauge to the ground might have an open circuit. Who is correct?

B only

When cleaning, servicing, and replacing batteries, Technician A says when disconnecting battery cables, disconnect the positive cable first. Technician B says if the built-in battery hydrometer indicates black, the charging system should be tested. Who is correct?

B only

Which tool is recommended by manufacturers to perform voltage measurements on circuits that are controlled or monitored by a control module?

Digital multimeter (DMM)

A technician is replacing the electronic module for the park assist system. Which of the following practices would most likely be required to assure a trouble free repair?

Disconnect the negative battery cable prior to beginning the repair.

A circuit breaker is removed from a functioning power seat circuit, and an ohmmeter is connected to the circuit breaker terminals. Technician A says the ohmmeter should provide an infinite reading if the circuit breaker is satisfactory. Technician B says the ohmmeter current may cause the circuit breaker to open. Who is correct?

Neither A nor B

A voltmeter connected across a starter solenoid's battery and motor terminals reads 0 volts when the ignition switch is turned to the START position. A distinct click is heard from the solenoid when this occurs, but the starter does not rotate. Technician A says there is excessive voltage drop in the circuit between the battery and the starter solenoid. Technician B says the starter solenoid needs to be replaced. Who is correct?

Neither A nor B

In the figure, the RR door power lock is inoperative, but all the other power door locks operate normally. Technician A says the door lock relay winding might have an open circuit. Technician B says the door unlock relay contacts might have an open circuit. Who is correct?

Neither A nor B

Technician A says if the charging system voltage is too high, there may be a loose or glazed drive belt. Technician B says if the charging system voltage is too low, the fault might be a grounded field wire from the regulator (full fielding the alternator). Who is correct?

Neither A nor B

Technician A says that overcharging a battery will not cause significant long-term damage. Technician B says that in hot weather, more current is needed to charge a battery. Who is correct?

Neither A nor B

Technician A says that worn starter brushes will cause high current draw. Technician B says that battery terminal corrosion will cause higher-than-normal current draw. Who is correct?

Neither A nor B

Technician A states that a "bus shorted" failure can be diagnosed by using an actuator (output) test on the scan tool. Technician B states that a "bus open" failure can be diagnosed by using an actuator (output) test on the scan tool. Who is correct?

Neither A nor B

The 12V battery in the drawing is fully charged and the switch is closed. The voltage drop across the light indicated on the voltmeter is 9 volts. Technician A says there may be a high resistance problem in the light. Technician B says the circuit may be grounded between the switch and the light. Who is correct?

Neither A nor B

The power windows work from the master switch but do not work from any of the other switches in the vehicle. Technician A says that the lockout switch could be stuck closed. Technician B says that the master switch main ground connection could be disconnected. Who is correct?

Neither A nor B

The right side headlight of a vehicle is very dim and the left side headlight is normal. Technician A says that the dimmer switch is likely defective. Technician B says that the left side headlight could have a bad ground. Who is correct?

Neither A nor B

Which of the following are true about light circuits?

Signal and stoplights often share a common bulb filament.

During an output test of the charging system, a technician finds that the charging current is at 75 amps. The specification for the vehicle is 115 amps. What is the most likely cause?

The output test was performed at idle.

A voltmeter that is connected across the input and output terminals of an instrument cluster illumination lamp rheostat (dimmer control) indicates 12.6 volts with the switch in the maximum brightness position and the engine off. Which of the following statements is true?

The voltage available at the lamps will be 0.0 volts.

The power window motor in the figure does not work from the window switch but works fine with the master switch. Which of the following statements represents the cause of this problem?

There is an open circuit between the circuit breaker and window switch.

Which type of sending unit would be used for the temperature gauge?

Thermistor

The battery voltage is disconnected from the electrical system in a vehicle with many on-board computers. This procedure may cause:

erasure of the computers' adaptive memories.

Both headlights on a vehicle have normal brilliance with the engine idling. When the engine is accelerated, both headlights become considerably brighter. The cause of this problem could be:

high charging system voltage.

In the signal light circuit in the figure, the right rear signal light is dim and all the other lights work normally. The cause of this problem may be:

high resistance in the D7 18BR RD wire from the signal light switch to the rear lamp wiring.

When performing a voltage drop test on the negative (ground) side of the starter circuit, a reading of 1.5 volts is obtained. All of the following could cause this result EXCEPT: a corroded negative battery terminal. a loose ground connection at the motor. high resistance in the starter field windings. an improperly mounted starter.

high resistance in the starter field windings

When diagnosing and testing a rear defogger circuit:

if a 12V test light is not illuminated at the middle part of a grid track, that track is open.

A cruise control system fails to maintain the correct speed as the vehicle climbs a steep hill. The LEAST LIKELY cause would be a:

misadjusted brake switch.

The primary use for the tool shown in the figure is: retrieving data from the on-board computer. observing waveforms of vehicle sensors. checking the vacuum created by the engine. reprogramming the on-board computer.

observing waveforms of vehicle sensors.

When testing diodes in the figure, the ohmmeter leads are connected across each diode and then the leads are reversed. A satisfactory diode provides:

one high meter reading and one low meter reading.

The charging system voltage on a vehicle is 16.2 volts. This condition may cause all of the following problems EXCEPT:

reduced headlight brilliance.

All of the following could cause a slow cranking condition EXCEPT:

shorted neutral safety switch.

In the figure, the voltmeter is connected to test the voltage drop across the:

starter ground circuit.

The tool shown in the figure is used for:

testing the impedance of the battery.

All of the following statements about using a lab scope for diagnosis are correct EXCEPT:

the size and clarity of the trace are dependent on the cleanness of the connection and the component or circuit being tested.

With the ignition switch off, the ohmmeter leads are connected from the starter solenoid S terminal to the solenoid case. The ohmmeter provides an infinite (¥) reading.The cause of this reading could be:

the solenoid hold-in winding is open.

All of these conditions would cause the starter not to crank the engine EXCEPT:

the starter drive pinion fails to disengage from the flywheel.

While performing the battery drain test in the figure:

the tester switch should be closed while starting or running the engine.

The back-up lights shown in the figure are inoperative. The fuse is good. With the gear selector in reverse and the ignition switch on, the voltage measured on both sides of the back-up light bulbs is 0.0 volts. The cause of this problem could be:

the wire from the back-up switch to the bulbs is open.

A digital speedometer constantly reads 0 mph. Technician A says a faulty speed sensor may be causing the problem. Technician B says the cause may be an open throttle position sensor. Who is correct?

A only

A vehicle cranks slowly during starting and current draw is high. Technician A says this could be caused by worn starter bushings. Technician B says this could be caused by high resistance in the battery ground cable. Who is correct?

A only

A vehicle has an inoperative parking lamp. Technician A says that an open wire between the switch and the bulb could be the cause. Technician B says that a shorted switch could be the cause. Who is correct?

A only

A vehicle has one dim taillight and the other taillights have normal brilliance. Technician A says there might be high resistance between the dim taillight and the ground. Technician B says there might be a defect in the taillight contacts in the headlight switch. Who is correct?

A only

An airbag warning light is illuminated intermittently with the engine running. Technician A says the airbag system has an electrical defect. Technician B says this defect may cause the airbag to inflate accidentally. Who is correct?

A only

An alternator with a 120 ampere rating produces 45 amps during an output test. A V-belt drives the alternator and the belt is at the specified tension. Technician A says the V-belt may be worn and bottomed in the pulley. Technician B says the alternator pulley may be misaligned with the crankshaft pulley. Who is correct?

A only

The horn in the figure sounds continuously. Technician A says the wire from the relay winding to the horn switch might be grounded. Technician B says the relay points might be stuck in the open position. Who is correct?

A only

Technician A says that a corroded parking lamp socket could cause dimmer than normal lamp operation. Technician B says that a single filament bulb can be used in place of a dual filament bulb. Who is correct?

A only

The headlights on a vehicle go out intermittently and come back on in a few minutes. Technician A says this problem may be caused by an intermittent short to ground. Technician B says this problem may be caused by high charging system voltage. Who is correct?

A only

The horn in the diagram does not operate. Technician A says that an open winding in the horn relay may be the cause. Technician B says that a shorted horn switch may be the cause. Who is correct?

A only

The back-up lights are inoperative. Technician A says that a faulty multifunction switch could be the cause. Technician B says that a stuck open back-up lamp switch could be the cause. Who is correct?

B only

While discussing a battery capacity test with the battery temperature at 70°F (21.1°C), Technician A says the battery load rate is calculated by multiplying the battery reserve capacity rating times 2. Technician B says the battery is satisfactory if the voltage remains above 9.6 volts. Who is correct?

B only

An inoperative sunroof is being diagnosed. A blown fuse for the sunroof is found. Technician A says the cables should be checked for a binding problem. Technician B says that the motor should be checked with an ohmmeter for a shorting problem. Who is correct?

Both A and B

Technician A says that an amp clamp is a useful tool to use when checking for key-off battery drain. Technician B says that a faulty rectifier bridge in the alternator could cause excessive key-off battery drain. Who is correct?

Both A and B

The horn on a late-model vehicle produces a weak sound. Technician A says the problem could be a bad horn relay. Technician B says that a loose ground connection at the horn could be the cause. Who is correct?

Both A and B

The rear-vertical motor in the power seat shown does not operate. Technician A says that during normal operation, there should be 12V at the Lt Gr/Rd wire near the motor when the motor is moving up. Technician B says that an open in the Lt Gr/Yl wire could be the cause. Who is correct?

Both A and B

When discussing headlight doors with separate electric motors and a control module, Technician A says some of these systems have a manual override knob to open the doors if the system fails. Technician B says the control module reverses polarity through the door motor to provide door opening and closing action. Who is correct?

Both A and B

While charging a battery at a high rate of current to fast-charge the battery, Technician A connects a voltmeter across the battery to make sure the voltage does not exceed 15.5 volts. Technician B monitors the battery's temperature and is prepared to reduce the charging rate when the temperature approaches 125°F (51.6°C). Who is correct?

Both A and B

While diagnosing a tone generator system on a late-model vehicle, Technician A says that if the device does not work at all, there could be an open in the circuit. Technician B says the tone generator should be checked for operation by running it through the prescribed self-test mode. Who is correct?

Both A and B

While diagnosing an instrument panel lighting circuit, Technician A says the power source for the lamps is provided through the headlight switch and/or a rheostat. Technician B says printed circuit boards should be replaced if they are faulty and cannot be repaired. Who is correct?

Both A and B

While diagnosing slower-than-normal wiper operation, Technician A says the wiper linkage may be binding. Technician B says there may be excessive resistance in the control circuit. Who is correct?

Both A and B

While discussing a radio static problem, Technician A says there might be a poor metal-to-metal connection between the hood and other body components. Technician B says the suppression coil might be defective on the instrument voltage limiter. Who is correct?

Both A and B

What is the most likely cause of a windshield wiper system that only works on low speed?

Faulty multifunction switch

Voice activation commands are used on some luxury vehicles to interact with all of the following accessory systems EXCEPT:

Power windows

A vehicle will not crank and the technician notices that the interior lights do not dim when the ignition switch is moved to the START position. What is the most likely cause?

Stuck open ignition switch

With the horn switch depressed, the voltage level measured at point A in the figure will be:

12 volts.

The sunroof in the diagram opened but failed to close. Which of the following is the most likely cause?

An open in the close relay control circuit

A control module needs to be programmed following the replacement of the hardware. Technician A says that a multimeter will be needed to measure the resistance of the new software. Technician B says that a module programming database is needed to retrieve the correct program to upload to the new module. Who is correct?

B only

A vehicle with a no-crank condition is being tested. When the battery and start terminals on the starter's solenoid are connected with a jumper wire, the starter begins to crank the engine. Technician A says the starter solenoid may be bad. Technician B says the ignition switch may be bad. Who is correct?

B only

A vehicle with speed-sensitive wipers is being diagnosed. The wipers do not change speed as vehicle speed increases, but otherwise operate normally. Technician A says that the wiper motor may be defective. Technician B says that the vehicle speed sensor (VSS) may be defective. Who is correct?

B only

Technician A states that the scan tool receives data from a connector located on the electronic control module (ECM). Technician B states that the scan tool connects to the data bus using a data link connector (DLC). Who is correct?

B only

The rear defogger grid clears in all areas of the rear window except for one section. Technician A says that a voltmeter should be used to check for a bad ground connection. Technician B says that a voltmeter should be used to check for an open circuit in the grid. Who is correct?

B only

When diagnosing and servicing power mirrors as shown in the figure:

each mirror contains a separate up/down and left/right motor.

During a starter current draw test, the current draw is more than specified, and the cranking speed and battery voltages are less than specified. The cause of this problem may be:

worn bushings in the starter motor.

What is the LEAST LIKELY problem that could cause a "no communication" message on a scan tool connected to a late-model vehicle?

Body control module (BCM) with an open internal circuit

Which of the following problems would most likely cause the stoplights to be inoperative?

Blown taillight fuse

When checking cranking circuit voltage loss on the positive side of the starting circuit, the technician uses a digital multimeter on the voltage setting and performs which of the following actions?

Connects one test lead to the positive battery terminal and the other to the starter positive terminal while the starter is cranked

All of these statements about airbag system service are true EXCEPT:

a 12-volt powered test light may be used to test continuity between the inflator module and the sensors.

The turn signal lights operate normally, but the hazard lights are inoperative. The most likely cause of this problem is:

a defective hazard flasher.

All of the following could cause an inoperative horn EXCEPT:

a horn relay that is stuck closed.

The convertible top operates when the down button is pressed, but the motor stalls when the up button is pressed. The cause of this problem might be:

a jammed linkage mechanism on the convertible top.

A customer complains about repeated failure of the taillight fuse. The most likely cause of this problem is:

an intermittent short to ground in a taillight wire.

The back-up lights shown in the figure are inoperative. With the gear selector in reverse and the ignition switch on, the voltage measured on both sides of the back-up light bulbs is 12 volts. The cause of this problem could be:

an open circuit between the back-up lights and ground.

The right rear power window operates normally from the master switch, but the window does not work using the right rear window switch. The cause of this problem may be:

an open circuit between the ignition switch and the right rear window switch.

When the rear defogger switch is turned on, the rear defogger light is illuminated, but there is no defogger grid operation as shown in the figure. The cause of this problem could be:

an open circuit between the relay and the defogger grid.

The power sunroof in the figure is completely inoperative. The cause of this problem could be:

an open circuit in the power saver relay winding.

A radio has a whining noise that increases with engine speed. When the alternator field wire is disconnected, the noise stops. All of the following defects may be the cause of the problem EXCEPT:

an open field winding.

A digital clock loses the correct time each time the ignition is turned off. The most likely problem is a:

blown "keep alive memory" fuse.

All of these statements about halogen headlight bulb replacement are true EXCEPT:

change the bulb with the headlights on.

Warning lights and warning devices are generally activated by:

closing of a switch or sensor.

Circuit 156 is shorted to ground at terminal splice 5363 in the figure. This problem may cause:

continual operation of the courtesy lights.

Circuit 157 is shorted to ground in the figure. This problem may cause:

continual operation of the under-hood light.

All of the following statements about radio antenna diagnosis with an ohmmeter are true EXCEPT:

continuity should be present between the end of the antenna mast and the antenna mounting hardware.

What type of problem is indicated by a lower-than-normal amperage reading when a circuit is activated?

High resistance in the circuit

If fuse 5 in the circuit shown in the figure is open, what would be the result?

Inoperative instrument cluster lights

In the power sunroof circuit in the figure, fuse 17 fails repeatedly. Technician A says the wire between fuse 17 and the power saver relay winding might be shorted to the ground. Technician B says the wire might be shorted to the ground between the power saver relay winding and the ground connection. Who is correct?

A only

A customer complains that the engine will not turn over. Technician A says to first check if the engine will turn over by turning the crankshaft pulley nut. Technician B says to check the battery condition first. Who is correct?

B only

A test light connected to ground does not illuminate when touched to either side of a fuse in the fuse box. Technician A says that the fuse is open. Technician B says that there is no power to the fuse. Who is correct?

B only

A vehicle cranks slowly during starting, and current draw is low. Technician A says that low engine compression could be the cause. Technician B says that corroded battery terminals could be the cause. Who is correct?

B only

The cruise control is inoperative as shown in the figure. Technician A says the vehicle speed sensor could be defective. Technician B says the 20-amp gauge fuse could be defective. Who is correct?

Both A and B

An ohmmeter is used to test a fusible link. Technician A says voltage should be supplied to the fusible link during the ohmmeter test. Technician B says if the ohmmeter reading is 0.0 ohms, the fusible link must be replaced. Who is correct?

Neither A nor B

The fuel gauge shown in the figure reads full continuously when the ignition switch is on. All the other gauges operate normally. The cause of the problem might be:

a short to ground between the gauge and the sending unit

None of the door locks function in the lock mode. With the lock button depressed, 12 volts are supplied to the lock relay. The cause of this problem could be:

an open ground connection at the unlock relay contacts.

All of the following practices are common when diagnosing supplemental inflatable restraint systems EXCEPT:

measuring resistance of the inflator module.

In the figure, the rear light ground on the right side of the diagram has a loose connection. The ground connection on the left side is satisfactory. This problem could result in:

no change in operation of the rear lights.

The rear light ground connection on the left side of the figure has an open circuit. The ground connection on the right side of the figure is satisfactory. This problem could result in:

no change in operation of the rear lights.

While cranking the engine, the voltmeter reading shows 0.1 volts. The cause of this problem could be:

normal resistance in the negative battery cable.

The total resistance in the figure is:

12 ohms

All of the following could cause a warning light not to work EXCEPT:

a short to ground in the sending unit circuit.

The auxiliary power outlet requires repeated fuse replacements. The cause of this problem could be:

a shorted auxiliary outlet.

During an output test using the full field method, a 100-ampere alternator with an integral regulator produces 60 amperes. The cause of the low alternator output could be:

a shorted diode in the alternator.

A six-way power seat moves vertically at the front and rear, but there is no horizontal seat movement. All of these defects may be the cause of the problem EXCEPT:

an open in the circuit from the switch assembly to ground.

Referring to the figure, a customer complained the power antenna went up when the radio was turned on, but would not go back down when the car was turned off. The cause of this problem could be:

an open in the down limit switch.

A composite headlight bulb is being replaced. Technician A says that touching the bulb with your finger may shorten its life. Technician B says that dielectric grease should be used to coat the connector terminals. Who is correct?

Both A and B

A full field test is performed on a vehicle with an internal regulator. Technician A says that if the output is within specifications, a faulty regulator may be the cause. Technician B says that an alternator should never be full fielded for more than a few seconds. Who is correct?

Both A and B

A fusible link at the alternator is being tested. Technician A says that battery voltage should be present at both sides of the fusible link. Technician B says that a replacement fusible link should never be longer than 9 inches. Who is correct?

Both A and B

A late-model luxury vehicle is being diagnosed for a problem in the driver's side heated seat. The seat stays hot at all times regardless of the seat heater switch position. Technician A says that a shorted seat heater relay could cause this problem. Technician B says that a grounded circuit between the seat heater relay and the body control module (BCM) could be the cause. Who is correct?

Both A and B

A vehicle is being diagnosed with a problem with the parking assist system. Technician A says a scan tool could be used to retrieve trouble codes from the control module. Technician B says that mud on the proximity sensors could cause the system to malfunction. Who is correct?

Both A and B

A wiring schematic is being used to diagnose an electrical problem on a vehicle. Technician A says that most schematics show the colors of the wires. Technician B says that most schematics are drawn with the power coming from the top of the picture. Who is correct?

Both A and B

An alarm system will not activate when the driver door is opened. Technician A says to check the driver door-ajar switch for corrosion. Technician B says to check that the interior lights are on when the driver door is open. Who is correct?

Both A and B

Powertrain control module (PCM) controlled charging systems are being diagnosed. Technician A says that a bidirectional scan tool can be used to test the voltage regulation function for fault codes. Technician B says that the alternator can be commanded to charge at full capacity with a bidirectional scan tool. Who is correct?

Both A and B

Technician A says that a corroded connection at the fuel sending unit could cause an electromagnetic fuel gauge to read too high. Technician B says that a grounded connection at the fuel sending unit could cause a bimetallic fuel gauge to read high. Who is correct?

Both A and B

Technician A says that battery state of charge can be tested using a voltmeter. Technician B says that a hydrometer reading must be corrected based upon temperature. Who is correct?

Both A and B

Technician A says that power must be turned off in the circuit before using an ohmmeter to make a measurement. Technician B says that the ohmmeter applies a small amount of voltage to the circuit to calculate resistance. Who is correct?

Both A and B

Technician A states that multiplexing allows several computers to share data from the same sensor. Technician B states that multiplexing allows for smaller wiring harnesses because the sensors do not have to be hardwired to every computer that needs their input. Who is correct?

Both A and B

The vehicle's anti-theft system will not disarm when the key is inserted in the driver's door. Technician A tries the key in the passenger side to see if the system disarms. Technician B checks for technical service bulletins (TSBs) for this problem. Who is correct?

Both A and B

The voltmeter in the circuit shown reads 9 volts. Technician A says that the cause could be high resistance in connector A. Technician B says that there could be high resistance in the switch. Who is correct?

Both A and B

The windshield wipers are being diagnosed for operating at only low speed regardless of switch position. Technician A says the problem may be the wiper switch. Technician B says the cause of the problem may be a worn high-speed brush. Who is correct?

Both A and B

There is no operation from the right rear power vent in the figure. The left rear power vent operates normally. Technician A says there may be an open circuit between the right rear power vent switch and ground. Technician B says the up/down contacts in the right rear power vent switch may be open. Who is correct?

Both A and B

When discussing an alternator with zero output, Technician A says the alternator field circuit may have an open circuit. Technician B says the fuse link may be open in the alternator-to-battery wire. Who is correct?

Both A and B