Prepare for the ASE A6 Electrical/Electronic Systems exam with these practice questions and answers. This guide covers batteries, starting systems, charging systems, lighting, and electrical diagnosis.
Q: Technician A only
Answer: A technician connects one lead of a DMM (digital multimeter) to the positive (+) terminal of a battery and the other meter lead to the “B” terminal of the starter solenoid and then cranks the engine. During cranking, the voltmeter displays a reading of 878 mV.Technician A says this reading indicates the positive battery cable has very high resistance.Technician B says this reading indicates that the starter armature is defective.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Replace the battery
Answer: 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 repair?a. Recharge the battery and return it to serviceb. Recharge the battery and retest itc. Replace the batteryd. Replace the voltage regulator
Q: Technician A only
Answer: Two technicians are describing battery charging.Technician A says to remove the surface charge from a recently charged battery and apply a 300-ampere load across the adapters for 15 seconds.Technician B says to remove the surface charge from batteries, which have been in storage.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician A only
Answer: A technician connects one lead of a DMM (digital multimeter) to the positive (+) terminal of a battery and the other meter lead to the “B” terminal of the starter solenoid and then cranks the engine. During cranking, the voltmeter displays a reading of 878 mV.Technician A says this reading indicates the positive battery cable has very high resistance.Technician B says this reading indicates that the starter armature is defective.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician B only
Answer: Technician A says proper starter operation depends on the battery being at a 95% charge and battery cables being of the correct size (gauge) and having no more than 0.8-volt drop.Technician B says voltage-drop testing includes cranking the engine, measuring the drop in voltage from the battery to the starter, and measuring the drop in voltage from the negative terminal of the battery to the engine block.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Defective starter drive
Answer: Which of the following could cause the starter to make a whining noise when engaged?a. Defective starter driveb. Defective solenoidc. Open pull-in windingd. Worn armature commutator
Q: Neither Technician A nor B
Answer: Two bulbs are connected in parallel to a 12 volt battery. Another bulb is added in parallel.Technician A says that the third bulb will be dimmer than the other two bulbs due to reduced current flow through the filament of the bulb.Technician B says that the amount of current flowing from the battery will decrease due to the extra load.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician B only
Answer: Two bulbs are connected in parallel to a 12 volt battery. One bulb has a resistance of 6 ohms and the other has a resistance of 2 ohms.Technician A says that only the 2 ohm bulb will light because all the current will flow through the 6 ohms bulb.Technician B says that the 6 ohm bulb will be dimmer than the 2 ohm bulb.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Both B & C
Answer: What causes a fuse to blow ?a. A sudden decrease in current through the circuitb. An increase in current through the circuitc. A decrease in circuit resistanced. Both B & C
Q: Both B & C
Answer: Many ground straps are uninsulated and braided because __________ ?a. They are less expensive than conventional wireb. They are more flexible to allow movement of the engine without breaking the wirec. They dampen Radio-Frequency Interference (RFI)d. Both B & C
Q: Both Technicians A and B
Answer: Technician A says that a test light should light on both test points of the fuse if it is ok.Technician B says that the fuse is defective if a test light only lights on one side of the fuse.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Both B & C
Answer: Which statement is true about fuse ratings ?a. The fuse rating should be less than the maximum current for the circuit.b. The fuse rating should be higher than the normal current for the circuit.c. 80% of the fuse rating should equal the current in the circuit.d. Both B & C
Q: The smaller the wire diameter
Answer: The higher the AWG #, ____________ ?a. The thicker the insulationb. The more strands in the conductorc. The smaller the wire diameterd. The larger the wire diameter
Q: Neither Technician A nor B
Answer: Two Technicians are discussing finding a short to ground using a test light.Technician A says that the test light, connected in place of the fuse, will light when the circuit that has the short is disconnected.Technician B says that the test light should be connected to the positive (+) and (-) terminals of the battery.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: An open neutral safety switch
Answer: Slow engine cranking can be caused by all of the following, EXCEPT:a. A low or discharged batteryb. Corroded or dirty battery cablesc. Engine mechanical problemsd. An open neutral safety switch
Q: The same anywhere in the circuit.
Answer: The amperage in a series circuit is _______________ ?a. High at the beginning of the circuit and decreases as the current flows through the resistance.b. The same anywhere in the circuit.c. Always less returning than leaving the battery.d. Variable in the circuit due to the different resistances.
Q: Source voltage.
Answer: The sum of the voltage drops in a series circuit equals the _______________________ ?a. Amperage.b. Wattage.c. Resistance.d. Source voltage.
Q: I = E / R
Answer: If the resistance and the voltage are known, what is the formula for finding the current (amperes) ?a. I = E / Rb. R = E x Ic. I = E x Rd. E = I x R
Q: Technician A only
Answer: A series Circuit has three resistors of 4 ohms each. The voltage drop across each resistor is 4 volts.Technician A says that the source voltage is 12 volts.Technician B says that the total resistance is 18 Ohms.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: 1 ampere.
Answer: If a 12 volt battery is connected to a series circuit with 3 resistors of 2 ohms, 4 ohms , and 6 ohms , how much current will flow through the circuit ?a. 1 ampere.b. 2 amperes.c. 3 amperes.d. 4 amperes.
Q: Technician A only
Answer: A series circuit has two 10 ohm bulbs. A third 10 ohm bulb is added in series.Technician A says that the three bulbs will be dimmer than when only two bulbs were in the circuit.Technician B says that the current in the circuit will increase.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Both Technicians A and B
Answer: Technician A says that the sum of the voltage drops in a series circuit should equal the source voltage.Technician B says that the current (amperes) varies depending on the value of the resistance in a series circuit.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Neither Technician A nor B
Answer: Two light bulbs are wired in series and one bulb burns out (opens).Technician A says that the other bulb will work.Technician B says that the current will increase in the circuit because one electrical load (resistance) is no longer operating.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician B only
Answer: Four resistors are connected to a 12 volt battery source in series. The value of the resistors are 10 ohms, 100 ohms, 330 ohms and 470 ohms.Technician A says that the the greatest voltage drop will occur across the 10 ohm resistor.Technician B says that the greatest voltage drop will occur across the 470 ohm resistor.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Both a & b.
Answer: In a series circuit ____________________ ?a. Current flow is the same at any point in the circuit.b. Total current resistance is equal to the sum of all resistances in the circuit.c. Both a & b.d. Neither a nor b.
Q: The current increases in the circuit.
Answer: If an accessory such as an additional light is spliced into an existing circuit in parallel, what happens ?a. The current decreases in the circuit.b. The voltage drops in the circuit.c. The resistance of the circuit increases.d. The current increases in the circuit.
Q: 3 ohms.
Answer: Three resistors are connected to a 12 volt battery in parallel. The current flow through each resistor is 4 amperes.What is the value of the resistors ?a. 1 ohm.b. 2 ohms.c. 3 ohms.d. 4 ohms.
Q: 12 volts.
Answer: Two (2) identical bulbs are connected to a 12 volt battery in parallel. The voltage drop across the first bulb is 12 volts as measured with a DVOM.What is the voltage drop across the other bulb ?a. 1 volt.b. 12 volts.c. 6 volts.d. Zero (0) volts.
Q: Short to ground
Answer: If an insulated (power side) wire rubbed through a part of the insulation and the wire conductor touched the steel body of a vehicle, the type of failure would be called a (an) ____________________ ?a. Short to voltage.b. Short to ground.c. Chassis ground.d. Open.
Q: Short to voltage
Answer: If two (2) insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called a (an) __________________ ?a. Short to ground.b. Floating ground.c. Open.d. Short to voltage.
Q: 4
Answer: If 12 volts are being applied to a resistance of 3 ohms, ______ amperes will flow ?a. 3b. 36c. 12d. 4
Q: 14.4 watts
Answer: How many watts are consumed by a light bulb if 1.2 amperes are measured when 12 volts are applied ?a. 144 wattsb. 14.4 wattsc. 0.10 wattsd. 10 watts
Q: 1500 watts
Answer: How many watts are consumed by a starter motor if it draws 150 amperes at 10 volts ?a. 15 wattsb. 15000 wattsc. 1500 wattsd. 150 watts
Q: All of the above
Answer: High resistance in an electrical circuit can cause ________ ?a. Dim lightsb. Clicking relaysc. Slow motor operationd. All of the above
Q: Increases
Answer: If the voltage increases in a circuit, what happens to the current (amperes) if the resistance stays the same ?a. Remains the sameb. Increasesc. Decreasesd. Cannot be determined
Q: 200 amperes
Answer: If 200 amperes flow from the positive terminal of the battery and operate the starter motor, how many amperes will flow back to the negative terminal of the battery ?a. About one-half (100 amperes)b. Zero (0)c. 200 amperesd. Cannot be determined
Q: Technician A only
Answer: A battery high rate discharge (load capacity) test is being performed on a 12 volt battery.Technician A says that a good battery should have a voltage reading of higher than 9.6 volts while under load at the end of the 15 second test.Technician B says that the battery should be discharged (loaded) to twice its CCA rating.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Short to ground
Answer: Which circuit failure is most likely to cause a fuse to blow ?a. Openb. Short to groundc. Short to voltaged. High resistance
Q: CCA
Answer: When load testing a battery, which batter rating is usually used to determine how much load to apply to the battery ?a. CCAb. CAc. MCAd. RC
Q: 20 to 30 millieamperes
Answer: Normal battery drain (parasitic draw) for a vehicle with computer and electronic circuits is ___________ ?a. 150 to 300 millieamperesb. 20 to 30 millieamperesc. 2 to 3 amperesd. None of the above
Q: The date it was shipped from the factory was April 2006
Answer: A battery date code sticker indicates D6.What does this mean ?a. It was built the second day of the week (Tuesday)b.The date it was shipped from the factory was December 2006c. The battery expires in December 2002d. The date it was shipped from the factory was April 2006
Q: The last connection should be the engine block of the dead vehicle.
Answer: When jump starting a vehiclea. The last connection should be the positive post of the batteryb.The last connection should be the engine block of the dead vehicle.c. The alternator must be disconnectedd. Both A and C
Q: .050
Answer: When measuring the specific gravity of the electrolyte, the maximum allowable difference between the highest and lowest hydrometer reading is __________ ?a. .010b. .050c. .020d. 0.50
Q: All of the above
Answer: When charging a lead acid (flooded type) battery, _____ ?a. The initial charging rate should be about 35 amperes for 30 minutesb. The battery temperature should not exceed 125 F (hot to the touch)c. The battery may not accept a charge for several hours, yet still be a good (serviceable) batteryd. All of the above
Q: True
Answer: All batteries should be in a secure bracket that is bolted to the vehicle to prevent physical damage to the batterya. Trueb. False
Q: Technician A only
Answer: Technician A says that distilled or clean drinking water should be added to a battery when the electrolyte level is low.Technician B says that fresh electrolyte (solution of acid and water) should be added.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Connect (+) positive to (+) positive and (-) negative to (-) negative
Answer: When jump starting a vehicle using jumper cables with a dead battery,what is the correct procedure?a. Connect (+) positive to (-) negative to create a parallel current aiding circuitb. Connect (+) positive to (+) positive and (-) negative to (-) negativec. Connect (-) negative cable first and the (+) positive jumper cable lastd. Make sure both vehicles are grounded together before making any connections
Q: C. Highest resistance contains the highest voltage drop
Answer: Which of these is true about a series circuit?A. Lowest resistance contains the most currentB. Lowest resistance contains the highest voltage dropC. Highest resistance contains the highest voltage dropD. Highest resistance contains the most current
Q: B. Logic probe
Answer: What tool can check continuity in wires that carry digital signals?A. VoltmeterB. Logic probeC. Analog meterD. Megger meter
Q: D. Across the circuit or component
Answer: While you use a DMM voltmeter function to evaluate voltage drop, the meter leads need to be connected in what way?A. To non-conductive materialB. On the positive side of the circuitC. In series with the circuitD. Across the circuit or component
Q: C. It is open
Answer: An analog ohmmeter needle won’t move when connected to both sides of the rotor. What does this mean about the rotor winding?A. It is groundedB. It is shortedC. It is openD. It is complete
Q: Both Technicians A and B
Answer: Technician A states that a short circuit to ground in a circuit decreases resistance.Technician B states that a short circuit increases current flow.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician A only
Answer: Two technicians discuss the state of charge of a battery. Technician A states that a specified gravity of 1.225 at 80 degrees F shows the battery has a state of charge at about 75%.Technician B states that it’s possible to use the hydrometer to check the state of charge if you are troubleshooting a maintenance-free battery.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A & BNeither Technician A nor B
Q: C. Worn bushings in the starter motor
Answer: While performing a starter current draw test, you notice the current draw is more than specified. The battery voltages and cranking speed appear to be less than specified.What is the cause of your problem?A. High resistance in the field windingsB. A burned solenoid disc and terminalsC. Worn bushings in the starter motorD. High resistance in the battery positive cable
Q: Both Technicians A and B
Answer: While discussing an alternator that has zero output.Technician A states that the field circuit might have an open circuit.Technician B states that the fusible link might be open to the alternator from the battery.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: OL
Answer: The alternator stator in the photo is being tested.What reading should you see on an ohmmeter if the stator is good?a. CLb. 1 ohmc. OLd. 0.4 ohms
Q: A. Low output from the alternator
Answer: What would be the least likely reason you experience a dim headlight out of these options?A. Low output from the alternatorB. Headlight connector is corrodedC. Headlight wiring has high resistanceD. Broken or damaged headlight assembly
Q: Technician B only
Answer: Technician A states that a loose serpentine alternative drive belt might lead to overcharging.Technician B states that undersized wiring between the battery and alternator might cause undercharging.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Defective 10 amp fuse
Answer: In this wiring diagram, the MIL (Malfunction Indicator Lamp) or SES (Service Engine Soon) does not illuminate when the ignition key is turned on. The vehicle also failed the diagnostic circuit check.Which of the following is the MOST likely cause?a. Defective 10 amp fuseb. High resistance at connector C108c. Open in yellow wire from the ECM pin 59 to the DLCd. Open in class 2 dark green wire from the ECM pin 9 to the DLC
Q: D. Rosin core
Answer: What solder type is needed for instrument panel wiring repair?A. 60/40 with no fluxB. Acid coreC. 50/50 with acid paste fluxD. Rosin core
Q: Both Technicians A and B
Answer: The vehicle turn signals begin to flash too slow. Technician A believes that the issue is caused by a faulty flasher.Technician B believes the bulb is an incorrect type.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: D. Wire leading to sending unit ground
Answer: When a faulty fuel gauge indicates a full tank, what’s the most likely reason?A. Stuck float in the up positionB. Open fuseC. Broken gaugeD. Wire leading to sending unit ground
Q: Technician B only
Answer: Technician A says proper starter operation depends on the battery being at a 95% charge and battery cables being of the correct size (gauge) and having no more than 0.8-volt drop.Technician B says voltage-drop testing includes cranking the engine, measuring the drop in voltage from the battery to the starter, and measuring the drop in voltage from the negative terminal of the battery to the engine block.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Blue wire from RKE (Remote Keyless Entry) module to vehicle theft module
Answer: A vehicle with an Anti-Theft system and RKE (Remote Keyless Entry) will not arm or activate but the power door locks work. The system arms with the key fob RKE transmitter. Using the wiring diagram, which of the following wires could have an open circuit and be the cause?a. Red wire from power door lock switch to Body Controllerb. Blue wire from RKE module to vehicle theft modulec. Green wire from RKE module to programd. Yellow wire from Key cylinder switch to theft module
Q: Disconnect the battery negative cable.
Answer: What is the first and most important step when servicing an air bag?a. Disconnect the battery negative cable.b. Disconnect the clockspring electrical connector.c. Take resistance measurements at all electrical connectors.d. Disconnect the impact sensors.
Q: Open at pin K of the Right Side Headlight Swivel Actuator
Answer: The adaptive front headlights only work on the left side of the vehicle in this wiring diagram, not on the right side. Which of the following could be the cause?a. Open at pin K of the Left Side Headlight Swivel Actuatorb. Open at pin K of the Right Side Headlight Swivel Actuatorc. Open fuse at G/B (F) locationd. Open at Pin L of the Adaptive Front Lighting Control Module
Q: C. Bad ground
Answer: The power seat system is noisy when operated. All of these might be the cause EXCEPT:A. Lack of lubricantB. Faulty motorC. Bad groundD. Faulty transmission
Q: Open at Pin 17 of the Radio Tape Player
Answer: The tape player in this wiring diagram only has sound coming out of both front speakers.Which of the following could be the cause?a. Blown dedicated 10 amp fuseb. Open at Pin 17 of the Radio Tape Playerc. Open at Pin 13 of the Radio Tape Playerd. Defective radio tape player
Q: You reprogram the vehicle with a scan tool (Personal Computer Interface).
Answer: A new vehicle comes with 2 key fobs or transmitters used with a RKE (remote keyless entry) system. The owner lost one of the transmitters and needs a replacement.Which of the following is the MOST likely procedure to be used?a. Replace the transmitter and it will relearn without reprogramming.b. You reprogram the vehicle with a scan tool (Personal Computer Interface).c. You reprogram the transmitter with the BCM (Body Control Module).d. Replace the BCM and transmitter.
Q: Both Technicians A and B
Answer: Two technicians are discussing this heating and air conditioning system wiring diagram.Technician A says a defective blower resistor (B4) can cause a no low blower speed condition.Technician B says a defective blower switch (B5) can prevent high speed operation.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: At the antenna to the radio
Answer: The radio/DVD (Digital Versatile Disc) system in the illustration has poor radio reception but the DVD player works okay. A technician is checking for high resistance using the diagram.Where would high resistance cause poor reception?a. At the radio groundb. At any speakerc. Across the fused. At the antenna to the radio
Q: High resistance at BCM terminal 22
Answer: A heated steering wheel is being diagnosed using the wiring diagram. The steering wheel fails to heat up but all other steering wheel controls and air bag functions are working okay.Which of the following is the LEAST likely cause?a. Open at pin 2 of the steering wheel control switch leftb. Open in-line 7.5 amp fuse on circuit 1639 pink wirec. Open 10 amp fuse at the RUN/CRK relayd. High resistance at BCM terminal 22
Q: Open at pin 85 of the 4-post relay yellow wire
Answer: A back-up camera does not work when the vehicle is put in reverse but does function when the manual switch is turned on.Which of the following could be the cause?a. Short to ground at Pin 86 of the 4-post relay brown wireb. Open at pin 85 of the 4-post relay yellow wirec. Open at the purple wire going to the camerad. Open at pin 13 of the white connector
Q: VSS (vehicle speed sensor)
Answer: The vehicle indicator icon on the video display jumps as the vehicle travels down the road on a vehicle equipped with a factory navigation system. Which of the following is the MOST likely cause?a. VSS (vehicle speed sensor)b. Yaw Sensorc. GPS (Global Positioning Satellite) antennad. EPS (Engine Position Sensor)
Q: Navigation Unit
Answer: The rear backup camera in this system diagram does not work. All of the following could be the cause, EXCEPT:a. Defective control relayb. Video groundc. Open in Red wired. Navigation Unit
Q: Neither Technician A nor B
Answer: A technician is checking the continuity of a 30-amp circuit breaker in a power convenience system with a DMM (Digital Multimeter).Technician A says the current from the ohmmeter will close the circuit breaker.Technician B says the ohmmeter should read OL (Out of Limits) or resistance infinity if the circuit breaker is good. Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Pin B of the yaw rate sensor is open at splice S308
Answer: A vehicle with electronic stability control has only one stored diagnostic trouble code for the yaw rate sensor and the vehicle swerves during hard baking and cannot maintain control.After reviewing the wiring diagram, which of the following could be the cause?a. Pin 17 of the EBCM (Electronic Brake Control Module) is openb. Connector 102 is unpluggedc. Pin B of the yaw rate sensor is open at splice S308d. Pin 5 of the EBCM is grounded
Q: Charging System
Answer: Before performing any diagnostic checks on a vehicle with a battery at 85% charge, all of the following electrical devices must function correctly, EXCEPT:a. Parking and low-beam headlightsb. Charging Systemc. Hornd. Electric door locks
Q: Technician B only
Answer: Technician A says you do not have to solder a repaired wire.Technician B says wire insulation damage is sometimes found where the wire passes through an opening in a metal part.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Remove 2 inches of insulation from each wire end.
Answer: When splicing the wires of an air bag wiring system, all of the following should be done, EXCEPT:a. Push 2 ends of wire together until strands are close to the insulation.b. Spread the strands of the exposed wire ends apart.c. Disconnect the battery before working on any wiring.d. Remove 2 inches of insulation from each wire end.
Q: Open at pin 8 of the left side control switch
Answer: The driver’s side remote power mirror does not move to the left in the wiring diagram.Which of the following could be the cause?a. Blue wire shorted to groundb. Open at pin 8 of the left side control switchc. 10 amp fuse blownd. Open at pin 6 of the left side control switch
Q: Brake switch out of adjustment
Answer: A driver has a concern that the adaptive (radar) cruise control often stops working when going over a bumpy road.Review the wiring diagram to determine what the cause could be.a. Brake switch out of adjustmentb. Defective control modulec. Defective radar sensing assemblyd. Cruise control switch out of adjustment
Q: A
Answer: A RKE (remote keyless entry) system horn is supposed to chirp when the lock button is depressed twice. A vehicle comes into the shop where the horns do not chirp when the door lock button is depressed twice. The vehicle’s power door locks and horns all work okay. The vehicle is equipped with a BCM (Body Computer Module).After reviewing the wiring diagram, where could the problem be in the diagram using the capital letters to identify locations?a. Ab. Bc. Cd. D
Q: 12-13 volts
Answer: When checking the rear window defroster electrical grids in the illustration, what voltage level would be found at point “A”?a. 12-13 voltsb. 20-30 voltsc. 0 voltsd. 1-2 volts
Q: Open in the tan wire (TN) at pin D of the seat adjuster switch
Answer: The power seat motor in the diagram does not move back and forth but all other power seat functions work okay.Which of the following is the MOST likely cause?a. Open in orange (OG) wireb. Defective seat adjuster switchc. Open in the Dark Green wire (D-GN) at pin K of seat adjuster switchd. Open in the tan wire (TN) at pin D of the seat adjuster switch
Q: Technician A only
Answer: Two technicians are explaining how to service an audio entertainment system.Technician A says that braided ground wire is best for repair and installation to help reduce interference. Technician B says to use a larger ground wire to reduce interference.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: High battery voltage
Answer: During an output test, an alternator produces lower-than-normal amperage, all of these could be the cause, EXCEPT:a. Regulator problemb. Engine speed is not high enough during testingc. Serpentine drive belt is slippingd. High battery voltage
Q: Technician B only
Answer: The figure shows a belt tensioner with four lines to indicate belt wear and the need for replacement. Technician A says when you install a new belt, the three line marks close to each other should be where shown in the figure when the belt is properly tensioned. Technician B says to always check the on-line service information for the belt wear indicators.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician B only
Answer: 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?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Twisting the belt
Answer: All of the following are methods of checking a serpentine drive belt tension after an alternator has been replaced, EXCEPT:a. Belt tension gaugeb. Matching marks on tensionerc. Twisting the beltd. Belt deflection
Q: Technician A only
Answer: Technician A says to test for maximum current output, the battery must be loaded to force the generator to produce its maximum output.Technician B says after disassembly, all AC generator internal components should be tested using an ammeter.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician A only
Answer: Technician A says a voltage-drop test of the charging circuit should be performed when current is flowing through the circuit.Technician B says to connect the leads of a voltmeter to the positive and negative terminals of the battery to measure the voltage drop of the charging system.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Open at pin 1 of the generator
Answer: The alternator in the above wiring diagram has zero output. Which of the following could be the cause?a. Open at pin 50 of the PCM (powertrain control module)b. Open at pin 6 of the PCMc. Resistance at pin 2 of the generatord. Open at pin 1 of the generator
Q: Technician A only
Answer: A charging system has a low output concern.Technician A says to check to perform a voltage drop test from Pin L of the PCM (Powertrain Control Module) to the alternator L terminal.Technician B says to check for high resistance from the IPC (Instrument Panel Cluster) in the dark green wire to the Data Bus.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Both Technicians A and B
Answer: Two technicians are discussing an alternator with zero output.Technician A says the field circuit may have an open in the #23 gray wire from the PCM to F terminal of the AC generator (alternator).Technician B says the fusible link may be open from the battery to the alternator.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: DC (Direct Current) volts
Answer: To check charging voltage, connect a DMM (digital multimeter) across the positive (+) and negative (-) terminals of the battery and select which of the following?a. DC (Direct Current) voltsb. AC (alternating current) voltsc. DC (Direct Current) amperesd. AC (alternating current) amperes
Q: Low battery voltage level
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 levelb. Battery gassingc. Low battery voltage leveld. High alternator amperage output
Q: Shorted-to-ground
Answer: When testing an alternator rotor, if the ohmmeter shows zero ohms with one meter lead attached to the slip rings and the other meter lead touching the rotor shaft, the rotor is which of the following?a. Operating normallyb. Shorted-to-groundc. Shorted-to-copperd. Windings are open
Q: Special tools are never needed.
Answer: All of the following are true in regards to the repair of a damaged molded connector in the charging system, EXCEPT:a. It must be cut off and replaced.b. It must be separated before making any repairs.c. Special tools are sometimes needed to remove the terminals.d. Special tools are never needed.
Q: Technician B only
Answer: Two technicians are discussing how to locate relevant service information.Technician A says paper service manuals are still the best resource for service information.Technician B says to follow the recommended service procedures contained in the on-line service information.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: 50% Duty Cycle
Answer: What waveform is shown in the figure?a. Sine waveb. 50% Duty Cyclec. 100% Duty Cycled. Sawtooth wave
Q: 4.7 volts
Answer: What voltage is shown on the digital storage oscilloscope for this wave form?a. 5 voltsb. 600 millivoltsc. 2 voltsd. 4.7 volts
Q: Technician B only
Answer: Two technicians are discussing a starting problem using this wiring diagram.Technician A says an open in the Dark Green wire between C1 (connector 1) and the Engine Control Module could be the cause.Technician B says an open in the yellow wire from the park/neutral switch to the cranking relay could be the cause.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Logic Probe
Answer: Which of the following tools can be used to check the continuity of wires that carry digital signals?a. Megger Meterb. Analog meterc. Logic probed. Voltmeter
Q: Technician A only
Answer: Two technicians are explaining how to service a fusible link.Technician A says to pull on each end to see if it stretches.Technician B says when a fusible link melts, it’s always visible.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: DLC (Data Link Connector)
Answer: To which of the following devices does a technician connect a Scan Tool?a. BCM (Body Control Module)b. ECM (Engine Control Module)c. DLC (Data Link Connector)d. PCM (Power Train Control Module)
Q: C and D
Answer: In order to measure the voltage drop across the switch in the figure, the voltmeter leads should be connected across which of the following points?a. D and Fb. D and Ec. C and Dd. A and B
Q: F to E
Answer: When using a DMM (Digital Multimeter) voltmeter function you are going to check for a voltage drop in the illustration using the capital letters.What is the LEAST likely way to connect the meter leads?a. A to Bb. A to Cc. C to Ed. F to E
Q: Technician B only
Answer: All the gauges in the instrument panel are inoperative. Technician A says to check the sending units.Technician B says to check the fuse for the instrument panel.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Interface device
Answer: What diagnostic device is shown in the photograph?a. Interface deviceb. Scan toolc. Laptop computerd. Scope adapter
Q: Blue
Answer: The code “BL” on a wiring diagram means what wire color?a. Blondeb. Bluec. Blackd. B or C
Q: Side closest to positive side of battery
Answer: When using the ammeter function of a DMM (Digital Multimeter), the red lead should be connected to what area of the connector?a. Side closest to positive side of batteryb. Side farthest from positive side of batteryc. Side farthest to negative side of batteryd. Side closest to negative side of battery
Q: Open between Pin K of the BCM & DLC
Answer: When the technician connects the factory scan tool to the Data Link Connector (DLC) of a vehicle, the scan tool will not communicate with the vehicle.Using the above wiring diagram, where could the problem be?a. Open at Pin 37 of the TCM (Transmission Control Module)b. Short to ground at Pin 6 of the Fuel System Control Modulec. Short to ground at Pin 21 of the Fuel System Control Moduled. Open between Pin K of the BCM & DLC
Q: Yellow wire
Answer: In the wiring diagram, the Engine Coolant Temperature (ECT) sensor is giving false readings but the variance is not enough to set a diagnostic trouble code. You need to check the operation of the ECT using a Digital Multimeter.Where would you place the red probe to measure the voltage drop across the ECT sensor?a. Yellow wireb. Black wirec. ECT signal inputd. Ground pin
Q: Voltage drop
Answer: What is being measured with the Digital Multimeter in the illustration?a. Amperageb. Voltage dropc. Voltage opend. PWM (Pulse width modulation)
Q: Ignition switch
Answer: All of the following components can cause an abnormal parasitic draw in a vehicle standing overnight with the ignition off, EXCEPT:a. Ignition switchb. Underhood lightc. Clockd. Glove box light
Q: Open or resistance infinity
Answer: The figure shows an “OL” on the Digital Multimeter when measuring resistance in a circuit.Which of the following could be the cause in the circuit?a. Open or resistance infinityb. Very small resistance amountc. Circuit in operationd. Complete circuit
Q: Open lead
Answer: When using the ohmmeter function of the DMM (Digital Multimeter) to check continuity, the display shows “OL”. Which of the following describes the meaning of “OL”?a. Short circuitb. Bad DMM batteryc. Open leadd. Over limit
Q: Open at G302
Answer: Use the wiring diagram for this question. None of the interior lights work.Which of the following could be the cause?a. Open at G302b. Open at Pin 1 of lamp switchc. Open at Circuit 522d. Open at Circuit 1732
Q: Neither Technician A nor B
Answer: Two technicians are discussing a typical non-electronic fuel gauge.Technician A says if the ground wire connection to the fuel tank sending unit becomes rusty or corroded, the fuel gauge will read full or near full.Technician B says if the power lead to the fuel tank sending-unit gets grounded, the fuel gauge should go to empty.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Wire to sending unit grounded
Answer: In this wiring diagram, if the fuel gauge reads full, while the other gauges read correctly, which of the following is the MOST likely cause?a. Broken gaugeb. Float stuck in the down positionc. Wire to sending unit groundedd. Defective ignition switch
Q: Technician A only
Answer: The rear defogger grid is being tested.Technician A believes that the voltmeter should decrease its reading while probing a grid line as it gets close to the ground bus bar.Technician B believes that when the voltmeter reads 12 volts at both ends of the grid line, it means there’s an open in the grid line.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Open at Pin 1 of RH lamp switch
Answer: Use the wiring diagram for this question. The right side courtesy reading lamp does not work but the rest of the interior lights work fine.Which of the following could be the cause?a. Open at G302b. Open at Pin 1 of RH lamp switchc. Open at Circuit 522d. Open at Circuit 1732
Q: Defective instrument panel bulb
Answer: In the wiring diagram, none of the instrument panel lights work.Which of the following is the LEAST likely cause?a. Blown fuseb. Defective Headlight switchc. Bad groundd. Defective instrument panel bulb
Q: Check affected circuit for a short to ground.
Answer: A technician finds a blown fuse in the driver information circuit.What should he do next?a. Replace fuse with the next higher amperage rating.b. Check affected circuit for a short to ground.c. Check affected circuit for an open.d. Install a circuit breaker of the same amperage rating as the fuse.
Q: Rosin core
Answer: What type of solder is required to repair the instrument panel wiring?a. Acid coreb. 60/40 with no fluxc. Rosin cored. 50/50 with acid paste flux
Q: Check affected circuit for a short to ground.
Answer: An instrument panel lighting circuit fuse is open.Which of the following should be your next step?a. Replace the fuse with the next higher amperage rating.b. Install a circuit breaker of the same amperage rating as the fuse.c. Check affected circuit for a short to ground.d. Check affected circuit for an open.
Q: A to B
Answer: In this circuit, a technician is checking the resistance of the fuel level sending unit resistor using the ohmmeter function of a DMM (Digital Multimeter) with the power OFF.Where should the DMM leads be placed?a. A to Bb. A to Cc. A to Dd. A to E
Q: 12.6 volts
Answer: The figure on the right shows a simplified diagram of the wiring on a trailer. If the battery supplies 12.6 volts, which of the following would be the voltage found at the fuse using a DMM (Digital Multimeter)?a. 1.2 voltsb. 6 voltsc. 10.6 voltsd. 12.6 volts
Q: Oil from your finger can cause shortened bulb life.
Answer: A defective halogen headlight bulb is being replaced. Why should you never touch the tip of a halogen bulb?a. Oil from your finger can cause shortened bulb life.b. The glass will crack.c. You can get a significant burn and personal injury.d. The glass will melt from the heat of your finger.
Q: ABS warning lamp to flash on once and then go off.
Answer: A defective taillight or front park light bulb could cause all of the following, EXCEPT:a. Turn signal indicator to light when lights are turned on.b. ABS warning lamp to flash on once and then go off.c. Dash lights to come on when the brake lights are on.d. Lights-on warning chime to sound if the brake pedal is depressed
Q: Technician A only
Answer: 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?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Poor ground
Answer: Electrical feedback is usually a result of what condition?a. High voltage in circuitb. Excessive current in circuitc. Poor groundd. Both a and b
Q: Neither Technician A nor B
Answer: Technician A says when checking a non-working component, one should check downstream from the component for an open circuit.Technician B says you should use an ammeter to check for an opening in a circuit.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Load 1 (Bulb) will burn out
Answer: The vehicle in the wiring diagram has a short to ground at the chassis ground.Which of the following will result?a. Load 2 (Bulb) will burn outb. Load 1 (Bulb) will burn outc. Load 3 (Bulb) will burn outd. Switch in from of Load 1 (Bulb) will burn
Q: Technician B only
Answer: The left front turn signal light does not flash and the left rear turn signal light flashes faster than normal in this wiring diagram. The right side works okay.Technician A says there could be an open in the purple wire from the turn signal flasher to the steering column connector.Technician B says there could be an open circuit between the light blue wire from the steering column connector and the left front bulb.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Wrong bulb filaments
Answer: Which of these would MOST likely cause the signal flasher to flash too fast?a. High current flowb. Wrong bulb filamentsc. Blown fused. Open switch
Q: Open circuit at D
Answer: In the wiring diagram, the left side turn signal indicator light does not work, but the left side turn signal works. The right side turn signal, brake lights and 4-way hazard flashers work okay.Which of the following could be the cause?a. Open circuit at Ab. Open circuit at Bc. Open circuit at Cd. Open circuit at D
Q: Technician B only
Answer: The fuse controlling the brake and turn-signal lights on a vehicle pulling a trailer constantly fails.Technician A says low voltage at the flasher unit or the wrong flasher could be the cause.Technician B says the fuse is not the right amperage for this combination.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Vehicle must be 10 feet from aiming screen
Answer: In the illustration, the HID (High Intensity Discharge) headlights are being aimed.Which of the following is LEAST likely to be a part of the process?a. Done on a Level floorb. Vehicle is unloaded without a driverc. Follow the state inspection specificationsd. Vehicle must be 10 feet from aiming screen
Q: Low alternator output
Answer: Which of the following is the LEAST likely cause of the left side headlight being dim in the wiring diagram?a. Headlight connector corrodedb. Damaged or broken headlight assemblyc. Low alternator outputd. High resistance in the headlight wiring
Q: Left parking light would be slightly brighter
Answer: Which of the following would MOST likely happen if a #1157 bulb were installed in a left front parking light socket instead of a #2057 bulb?a. Left turn signal would flash fasterb. Left turn signal would flash slowerc. Left parking light would be slightly brighterd. Left parking light would be slightly dimmer
Q: Bad passenger door lock motor
Answer: The doors on a vehicle won’t unlock with the remote keyless entry. These could all be the cause EXCEPT:A. Bad passenger door lock motorB. Blown circuit breakerC. Weak transmitter batteryD. Interference from a stronger radio transmitter
Q: Both Technicians A and B
Answer: The vehicle sunroof works intermittently.Technician A states that it might be a poor wiring connection.Technician B states that the panel might be binding in the rails.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: 6
Answer: How many 2.1-volt cells are in a standard 12-volt car battery?128106
Q: Both a and c
Answer: Every time the lights were turned on, the left-side turn signal indicator light on the dash remained on.Which of the following is the MOST likely cause?a. Poor ground to parking light (or taillight) bulb on left sideb. Poor ground to parking light (or taillight) bulb on right sidec. Defective (open) parking light (or taillight) bulb on left sided. Both a and c
Q: Open
Answer: A shunt diode shown in Circuit 347 in the above wiring diagram has a high resistance or an infinite reading in both directions which is:a. Shortedb. Openc. Forward-biasedd. Reverse-biased
Q: Create electrical load
Answer: Why should the lights be turned on when checking for ripple voltage or AC current from the alternator?a. Warm batteryb. Check that battery is fully chargedc. Create electrical loadd. Test battery load
Q: The source voltage
Answer: According to Kirchhoff’s Voltage Law, the sum of all the voltage drops in a closed loop system are going to be equal to ________.The source voltageThe resistance10-voltsThe source amperage
Q: Technician A only
Answer: The horn is making a weak sound.Technician A believes the faulty power connection is the reason.Technician B believes the faulty fuse might be the cause.Who is correct?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Both Technicians A and B
Answer: Two technicians are explaining the cause of slow cranking and high current draw.Technician A says an engine bearing could be the cause.Technician B says the starter motor armature could be binding or defective.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: 0.2 volts
Answer: A technician is using the 2 DMM (Digital Multimeter) leads to measure the voltage drop between the battery terminal (red lead) and the cable end (black lead).In the photo, what is the highest voltage drop allowed across the battery terminal to the battery cable end?0.7 volts2 volts4 volts0.2 volts
Q: Technician B only
Answer: Two technicians are describing a parasitic draw test like the one shown in the photo.Technician A says it is abnormal for a battery to self-discharge when there is no load such as a computer memory.Technician B says some original equipment manufacturers specify a maximum allowable battery drain (parasitic draw) based on the reserve capacity of the battery.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Technician A only
Answer: Technician A says the CANDi (Controller Area Network Device Interface) module used on GM vehicles will flash an LED rapidly if communication is detected.Technician B says late model vehicles use a jumper wire to connect two pins of the DLC (Data Link Connector) to read Diagnostic Trouble Codes on a scan tool.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Supply voltage to prevent loss of settings.
Answer: What is the device shown in the figure?a. Supply voltage to prevent loss of settings.b. Supply voltage to PCM (Powertrain Control Module) for diagnosis.c. Control system re-programming.d. Control voltage to PCM to prevent DTCs (diagnostic trouble codes) loss.
Q: Radio replacement
Answer: On some luxury model vehicles, equipped with a radio security system, a radio unlock code is required for all of the following conditions, EXCEPT:a. Battery disconnectedb. Factory radio harness disconnectedc. Dead Batteryd. Radio replacement
Q: Technician A only
Answer: Two technicians are describing battery charging. Technician A says to remove the surface charge from a recently charged battery and apply a 300-ampere load across the adapters for 15 seconds.Technician B says to remove the surface charge from batteries, which have been in storage.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Starter Current Draw Test
Answer: What test is being performed in the photo?a. Starter voltage drop testb. Battery Chargingc. Starter current draw testd. Starter cable continuity
Q: The last connection is to the positive battery terminal.
Answer: A vehicle with a dead battery is being started using the jump box shown in the photo. Which is LEAST likely to be performed in this process?a. The last connection is to the engine block or bracket of the dead battery vehicle.b. Use the special ground connection in the engine compartment.c. The last connection is to the positive battery terminal.d. Make sure the jump box is fully charged.
Q: Conductance
Answer: What type of battery test is being conducted in the photo?a. Conductanceb. Loadc. Voltaged. Parasitic load
Q: A
Answer: A starter current draw is being performed in the illustration. This test is performed with either a AVR (Alternator Voltage Regulator) Tester or a voltmeter and an amp probe or inductive ammeter along with a carbon pile. You clamp the amp probe or ammeter pickup around which of the lettered areas in the figure?a. Ab. Bc. Cd. D
Q: Parasitic Load Test
Answer: After sitting overnight, a battery is below 9.6 volts and fails to start.What battery testing procedure is being performed in the photo to check this concern?a. Load Testb. Parasitic Load Testc. Capacitanced. Voltage Drop
Q: 12.6 volts
Answer: 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 voltsb. 4 volts per cellc. 1 volt per celld. 12.6 volts
Q: Neither Technician A nor B
Answer: Two technicians are explaining how to adjust the drive belt when replacing an alternator.Technician A says on a serpentine belt, the tension is adjusted by moving the tensioner up or down.Technician B says to recheck tension run the engine for one hour to see if the belt is in the specified range for a used drive belt after the alternator has been replaced.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: Improper wiring repair.
Answer: What action is taking place in the above photo?a. Repairing the wiring on an ignition switch.b. Replacing the ignition switch.c. Improper wiring repair.d. None of the above.
Q: Defective 175 amp maxifuse
Answer: Charging system output is being checked on a vehicle with this wiring diagram. There is NO current output. Which of the following could be the cause?a. open at ECM (Electronic Control Module) pin 70b. Defective 175 amp maxifusec. Open at Pin 1 of alternator 1d. Bad ground at alternator 2
Q: Both Technicians A and B
Answer: Technician A says that there is often more than one circuit being protected by each fuse.Technician B says that more than one circuit often shares a single ground connector.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: 87a
Answer: Which relay terminal is normally closed (NC) ?a. 87b. 85c. 30d. 87a
Q: Both Technicians A and B
Answer: Technician A says that a good relay should measure between 60 and 100 ohms across the coils terminals.Technician B says that OL should be displayed on an ohmmeter when touching terminals 30 and 87.Who is right?Technician A onlyTechnician B onlyBoth Technicians A and BNeither Technician A nor B
Q: 86 and 85
Answer: To test a relay using an ohmmeter, which two terminals should be touched to measure coil resistance ?a. 86 and 87b. 86 and 85c. 87 and 30d. 87a and 87
Q: A splice of a brown with black stripe, wire size being 0.8 square millimeters
Answer: On a wiring diagram, S110 with a “.8 BRN/BLK” means ?a. A splice of a brown with black stripe, wire size being 0.8 square millimetersb. A connector with 0.8 square millimeter wirec. Circuit # 0.8 spliced under the hoodd. Both A & B
Q: Cranking Amperes (CA)
Answer: Which battery rating is tested at 32°F (0°C)a. Cold Cranking Amperes (CCA)b. Cranking Amperes (CA)c. Reserve Capacity (RC)d. Battery voltage test
Q: Cold Cranking Amperes (CCA)
Answer: Which battery rating is tested at 0°F (-18°C)a. Cold Cranking Amperes (CCA)b. Cranking Amperes (CA)c. Reserve Capacity (RC)d. Battery voltage test
Q: Hydrogen and Oxygen
Answer: What gas (es) is (are) released when a battery is being charged ?a. Nitrogen and Oxygenb. Oxygenc. Hydrogend. Hydrogen and Oxygen
Q: Both A & B
Answer: A fully charged battery showed indicate _____________ ?a. 12.6 volts or higherb. A specific gravity of 1.265 or higherc. 12 voltsd. Both A & B
Q: All of the above
Answer: The positive battery plate is ________________ ?a. Brown in colorb. Sometimes called lead peroxidec. Lead Dioxided. All of the above
Q: The battery os fully discharged and then recharged
Answer: Deep cycling means what ?a. The battery os fully discharged and then rechargedb. Overcharging the batteryc. The battery is overfilled with acid (H2SO4)d. Overfilling or under filling the battery with water