ASE A6 - Electrical/Electronic Systems
While testing a starting circuit on a 5.7L V8 engine, the technician 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 technician do next? A. Check voltage drop of the starter motor circuit B. Test the battery capacity C. Replace starter motor, as a short is indicated D. Determine condition of the engine
If an engine cranks slowly and the starter current draw is only 90 amps and the voltage is as high as 11 volts, the technician should next check for excessive voltage drop in the start motor circuit.
Another way of saying 75 millivolts is: A. 0.075 volts B. 0.75 volts C. 7.5 volts D. 7.05 volts
The correct answer is 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
The correct answer is 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 the 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.
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. a good ground.
The correct answer is A. A voltmeter should first be used to see if the circuit is getting power before during further tests.
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
The correct answer is A. Adding an additional path through which the current can flow has decreased the total resistance of the circuit. Each light drops 12 volts.
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.
The correct answer is A. Conventional sealed beams have all but been replaced by the other types of headlamps listed in this question.
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
The correct answer is A. For best results and less corrosion at the solder point, a rosin core flux should be used.
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
The correct answer is 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 would not sound at all.
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.
The correct answer is 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.
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
The correct answer is 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 the 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 lights on a vehicle, all of these can be checked EXCEPT: A. Condition of filament B. Continuity C. Power circuit D. Ground circuit
The correct answer is 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 the light, just as you would for a conventional incandescent light.
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 s within specification. Technician A says that the circuit between the indicator light and the pressure switch could be grounded. Technician B says that an open in the pressure switch itself 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
The correct answer is 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 prevents the light from coming on.
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
The correct answer is 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
The correct answer is 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.
The condition of a lead-acid battery is being checked. Technician A says to use a galvanometer. Technician B says to use a capacitive battery tester. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is B. A galvanometer is an analog type voltmeter. OEMs almost universally recommend the use of a non-intrusive conductive-capacitive type battery tester.
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
The correct answer is B. Always disconnect the negative battery cable and wrap with tape so contact cannot be made. Follow the specific vehicle's disarming instructions, as some SRS system can retain backup power for an additional period of time.
When troubleshooting a slow drain on the battery, which of these diagnostic tools should be used? A. Ohmmeter B. Ammeter C. Voltmeter D. Test light
The correct answer is B. Always us an ammeter or a low amperage amp clamp with your DMM to troubleshoot a slow drain in an electrical circuit.
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 6.2 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
The correct answer is 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 be that all the system voltage was being used by the light. The reading of 6.2 volts means that ere 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
The correct answer is 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
The correct answer is B. Resetting circuit breakers are not used in taillight circuits. Fusible links are often identified by colored insulation- red, pink, brown, yellow, etc. The color indicates the amount of maximum circuit protection available.
All of these are used when applying Ohm's Law EXCEPT: A. Amperes (I) B. Watts (W) C. Ohms (R) D. Voltage (E)
The correct answer is B. The components of Ohm's Law include voltage (E), amperes (I), and Ohms (R)
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
The correct answer is 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
The correct answer is 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 recommend 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
The correct answer is B. The start/clutch interlock switch is open when the clutch 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 DTC 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
The correct answer is 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 circuit resistance C. An open circuit D. A decrease in circuit voltage
The correct answer is B. When performing a current draw test using an ammeter, a decrease in circuit resistance will cause a reading greater than 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 all 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
The correct answer is B. When using an ohmmeter, all the 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
The correct answer is B. Worn or missing fly-wheel ring gear teeth may be not enable the starter to rank the engine, but would not cause the starter itself to be inoperative. All of the other choices could prevent the starter from operating.
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
The correct answer is B. if all the gauges were dead, the 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.
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. Technician B only C. Both A and B D. Neither A or B
The correct answer is C, both technicians are right. 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 binding of the wiper linkage.
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
The correct answer is C, both technicians 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.
Technician A says a short circuit to ground in a circuit will decrease resistance. Technician B says a short circuit will increase current flow. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is C, both technicians are right. A short to ground has little or no resistance. Current flow increases as resistance decreases.
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
The correct answer is C, both technicians are right. An infinity reading indicates an open wire; a zero or low reading indicates a good connection.
A vehicle's turn signals flash too slowly. Technician A claims that the condition could be caused by a faulty flasher. Technician B says that a bulb may be the wrong type. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is C, both technicians are right. Both an improperly rated flasher and an incorrect wattage bulb can cause the turn signals to flash at incorrect intervals.
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
The correct answer is C, both technicians are right. 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 that 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
The correct answer is C, both technicians are right. Current will be divided across the loads and the voltage is the same at each load.
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
The correct answer is C, both technicians 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.
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
The correct answer is C, both technicians are right. 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.
An electronic digital speedometer is stuck at zero. Technician A says that this could set a DTC. 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
The correct answer is C, both technicians 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.
Technician A says that a noisy alternator could be caused by a bad diode. Technician B says that a noisy alternator could be caused by a worn bearing. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is C, both technicians are right. Worn alternator bearings and/or a bad alternator diode will cause the alternator to be noisy.
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
The correct answer is 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 exists in the motor's circuit. D. there is a short in the motor.
The correct answer is 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.
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
The correct answer is C. Air bag system wiring harness should not be repaired and only replaced. All of the other answers are true statements regarding air bag systems.
When performing soldering, the purpose of a soldering iron is to heat the: A. Flux B. Solder C. Conductors D. Heat shrink tubing
The correct answer is C. Contrary to popular belief, the purpose of soldering iron is not to melt the solder itself, but rather to heat the parts being soldered.
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
The correct answer is C. Short light bulb life and a battery that continually needs water are indications of overcharging.
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
The correct answer is 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.
Both headlights on a vehicle are dim on high beam but are normal on low beam. Technician A says that a poor headlight ground could be the cause. Technician B says that a shorted headlight switch 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
The correct answer is D, neither technician 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.
Technician A says that a test light 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. Technician B only C. Both A and B D. Neither A or B
The correct answer is D, neither technician 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.
Technician A says that using a 20,000 ohm/volt analog meter is a good choice for ECM circuit testing. Technician B says that careful use of a test light can determine the condition of a throttle position sensor (TPS). Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is D, neither technician 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.
Nothing happens when the ignition key is turned to the START position in a vehicle with a good battery. Technician 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 circuit. Technician 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. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is D, neither technician is right. If a jumper wire is connected between the battery and the solenoid 'D' 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.
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
The correct answer is D, neither technician is right. 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 vehicles electrical system before any testing is done.
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
The correct answer is D, neither technician 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.
Technician A says that an in-vehicle high-rate discharge battery load test should always be performed on a 12-volt battery if its condition is in question. 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
The correct answer is D, neither technician is right. The high-rate discharge (load) test of a battery is frowned upon by OEMs because of the likelihood of over-stressing the alternator. If done with the battery removed or disconnected from the vehicle, the load applied should be three times the batteries ampere-hour rating or half of its CCA rating.
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
The correct answer is D, neither technician 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.
Technician A says that a battery with an open circuit voltage of 12.1 volts is fully charged. Technician B says that if the indicator on a sealed maintenance-free battery is yellow, the battery should be charged. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B
The correct answer is D, neither technician is right.Technician A is wrong because 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.
All of the following warning system lights us a grounding switch EXCEPT: A. Oil pressure B. Coolant temperature C. Brake warning D. Charging system
The correct answer is 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, the 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.
When testing computer-controlled systems, a digital multimeter should be used with an input impedance of at least: A. 10k ohms B. 100k ohms C. 1 megohm D. 10 megohms
The correct answer is D. For maximum protection to the computer-controlled system, or any electronic circuit, it is best to use at least a 10-megohm impedance digital multimeter.
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
The correct answer is D. Multiplexed networks can be monitored and tested using an OEM or equivalent scan tool.
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
The correct answer is 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.
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
The correct answer is D. The on-board diagnostic system will set a code beginning with the letter U.