Appendix A ASE PRACTICE EXAMINATION

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Isabel Boyd
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1 Appendix A ASE PRACTICE EXAMINATION 1. The current draw of a window motor is being measured. Technician A says the ammeter can be connected on the power supply side of the motor. Technician B says the ammeter can be connected on the ground side of the motor. 2. The digital readout of an auto-ranging DVOM that is in the volts position displays Which of the following statements is true about this measurement? A. The actual value is 13.7 V. B. The actual value is 13.7 mv. C. The actual value is 137 mv. D. More information is needed in order to determine the actual value. 3. A voltmeter that is connected across the input and output terminals of an instrument cluster illumination lamp rheostat indicates 12.6 volts with the in the maximum brightness position and the engine off. Which of the following statements is true? A. The voltage available at the lamps will be about 12.6 volts. B. The voltage available at the lamps will be 0.0 volts. C. The rheostat is operating correctly. D. More information is needed in order to determine whether the lamps will operate correctly. 4. An analog voltmeter is indicating 0.45 volt. Which of the following represents this measurement? A mv. B. 450 mv. C. 4.5 mv. D V. 5. The following information about a fuel injector control signal has been gathered using a lab scope: Frequency is 10 Hz and pulse width is 5 ms. Technician A says this means that the injector is being turned on and off 10 times per second and that the length of time the injector is open during each on pulse is 5 ms. Technician B says this means that the injector is being turned on and off 10 times per second and that the length of time the injector is closed during each off cycle is 95 ms. 6. Oscilloscope testing is being discussed. Technician A says the preferred method to use when observing the output of a potentiometer is to select an external trigger. Technician B says, when analyzing the output of a low-voltage computer input sensor, a high trigger level should be selected. 7. The left-rear and right-rear taillights and the leftrear brake light of a vehicle turn on dimly whenever the brake pedal is depressed; however, the right-rear brake light operates at the correct brightness. Technician A says the left-rear taillight and brake light may have a poor ground connection. Technician B says the brakelight may have excessive resistance. 689

2 Appendix A ASE PRACTICE EXAMINATION 8. The horn of a vehicle equipped with a horn relay sounds weak and distorted whenever it is applied. Which of the following is the least likely cause of this problem? A. High resistance in the relay load circuit. B. High resistance in the horn ground circuit. C. Excessive voltage drop between the relay load contact and the horn. D. Excessive voltage drop across the relay coil winding. 9. The circuit breaker that protects an electric window circuit blows 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. 10. The relay coil resistance of an inoperative electric antenna circuit is 0.5 K ohms. Technician A says this could prevent the proper operation of the antenna motor. Technician B says this could result in the antenna rising but not retracting. NOTE: Question 11 refers to the horn circuit on page The horn circuit wiring diagram is being discussed. Technician A says the wire that provides the ground path for the high-note horn is an 18-gauge black wire that is part of circuit Z1. Technician B says the wire that provides power to the horn relay coil is a violet wire that is connected to terminal 87 of the relay. 12. The wiring diagram is being discussed. Technician A says the wire that activates the rear wiper motor module originates at terminal G of the rear window/wiper. Technician B says there are only three wires connected to the accessory panel of this vehicle. 13. Domestic and import wire sizes are being discussed. Technician A says a 14-gauge wire is larger than a 16-gauge wire. Technician B says a 0.8 wire is smaller than a 1.0 wire. 14. What is the expected total current flow through a 12-volt circuit with two 12-ohm resistors connected in parallel? A. 0.5 ampere C. 2 amperes B. 1 ampere D. 32 amperes 15. A hydrometer that is being used to measure the specific gravity of a battery indicates Technician A says if the ambient temperature is 70 F, the corrected specific gravity reading will be Technician B says if the battery temperature is 60 F, the corrected specific gravity reading will be The specific gravity of each of the cells of a battery is as follows: 1.220, 1.245, 1.190, 1.205, 1.210, and Which of the following procedures should be performed? A. Charge the battery and then retest the specific gravity. B. Perform a battery capacity test. C. Perform a three-minute charge test. D. Replace the battery. NOTE: Question 12 refers to the rear wiper/washer on page

3 Appendix A ASE PRACTICE EXAMINATION 17. A battery has an open circuit voltage of 12.1 volts. Technician A says a battery capacity test should now be performed. Technician B says the battery should now be charged. 18. test series is being discussed. Technician A says to perform the battery capacity test first. Technician B says the state of charge test is always the last test performed. 19. All of the following could cause a slow cranking condition except: A. Overadvanced ignition timing. B. Shorted neutral safety. C. Misaligned starter mounting. D. Low battery state of charge. 20. A vehicle owner states that occasionally he is unable to start his car: the engine will start cranking at normal speed and then all of a sudden he will hear a whee sound and at that point the engine will stop cranking. After four or five attempts, the engine will finally start. Technician A says the starter drive gear may be slipping. Technician B says there may be excessive voltage drop across the starter-solenoid contacts. 21. A vehicle with a no-crank condition is being tested. When the starter-solenoid battery and start terminals are connected with a jumper wire, the starter begins to crank the engine. Technician A says the starter-solenoid may be faulty. Technician B says the ignition may be faulty. 22. A vehicle is being tested for a slow-crank condition. One lead of a voltmeter is connected to the positive battery post and the other lead is connected to the motor terminal of the starter-solenoid. With the ignition key on, the voltmeter indicates 12 volts; when the engine is cranked, the voltmeter indicates 0.2 volt. Technician A says the positive side of the startersolenoid load circuit is OK. Technician B says the negative side of the starter circuit may have excessive voltage drop. 23. A technician is performing an output test on an AC generator (alternator) rated at 100 amperes with an internal regulator. During the test, it produces 30 amperes. The cause of the low output may be: A. Shorted diode. B. Open sense circuit to the regulator. C. Worn brushes. D. Faulty capacitors. 24. A charging system voltage output test reveals the following information: 1. Base voltage: 12.6 volts. 2. At 1,500 rpm: 13.3 volts. 3. At 2,000 rpm with loads on: 13.0 volts. Technician A says the alternator output voltage is lower than normal. Technician B says there may be excessive resistance on the insulated side of the charging circuit. 25. Charging system voltage and amperage on a vehicle equipped with an external voltage regulator is 12.1 volts and 0 amps at 1,500 rpm with all loads applied. When the alternator is full-fielded under the same conditions, the values rise to 13.8 volts and 95 amps. All of the following statements concerning these tests are correct except: A. The alternator may have an open field circuit. B. The voltage regulator s voltage limiter contacts may have excessive resistance. C. The voltage limiter may have an open coil winding. D. The alternator is capable of charging correctly. 691

4 Appendix A ASE PRACTICE EXAMINATION 26. Alternator diode testing is being discussed. Technician A says an AC voltmeter can be used to check for faulty diodes. Technician B says an ammeter can be used to check for faulty diodes. 27. Technician A says that a short to ground in the PCI bus network circuit will result in total bus network failure. Technician B says an open PCI bus circuit wire to the BCM will result in total bus network failure. 28. Technician A says that the normal at rest voltage for the PCI bus is 0 volt. Technician B says that the normal active voltage on the PCI bus is 12 volts. 29. Technician A says that the location of an open CAN B bus circuit can be located by shorting the other circuit to ground while observing the module communications on the scan tool. Technician B says if the fault code indicated that a CAN C circuit is shorted, this would cause a total failure of the CAN C bus. 30. Technician A says the normal voltmeter reading on the CAN B(+) circuit with the ignition key in the RUN position is between 280 and 920mv. Technician B says normal CAN C bus termination is 60 ohms. 31. How much total resistance is in a 12-volt circuit that is drawing 4 amperes? A ohm B. 3 ohms C. 4.8 ohms D. 48 ohms 32. A replacement halogen bulb for a composite lamp was replaced but it lasted for a very short period of time; all of the other bulbs on the car are working fine. Which of the following could account for the premature failure of the bulb? A. Excessive charging system voltage. B. Fingerprints on the bulb. C. Excessive voltage drop in the power feed circuit to the bulb. D. Excessive resistance in the ground circuit of the bulb. 33. The turn signals of a vehicle are inoperative. The green indicator bulbs that are supposed to flash when the turn signal is moved to either the left- or right-turn position do not turn on at all. Technician A says the turn signal flasher contacts could have fused closed. Technician B says the circuit from the turn signal flasher to the turn signal may be open. NOTE: Question 34 refers to the headlight on page Referring to the wiring diagram: the lighting circuit of this vehicle has the wire that is connected to the headlamp dimmer shorted to ground. Which of the following statements concerning this problem is true? A. The 10-amp fuse will blow when the headlights are turned on. B. The 15-amp fuse will blow immediately. C. The 10-amp fuse will blow immediately. D. The circuit breaker will open the circuit when the headlights are turned on. NOTE: Question 35 refers to the multifunction on page

5 Appendix A ASE PRACTICE EXAMINATION 35. Which of the following statements about the circuit is true? A. The retract relay-up coil power feed comes from terminal 106 of the multifunction. B. The power feed to the multifunction comes from the theft warning main control amp. C. The retract relay-up load circuit power feed comes from terminal 111 of the multifunction. D. Terminal 106 of the multifunction is connected to ground. 36. Technician A says a voltmeter connected to the input wire of an IVR should indicate a fluctuating voltage. Technician B says an open IVR on a single-gauge system could prevent the proper operation of the coolant temperature warning light. 37. The fuel gauge of a vehicle equipped with an electromagnetic gauge cluster indicates a full tank, regardless of the actual amount of fuel in the tank. Which of the following could be the cause of this problem? A. Open IVR. B. Open fuel gauge sender unit. C. An open circuit between the gauge and the sending unit. D. A grounded circuit between the fuel gauge and the fuel gauge sender unit. NOTE: Question 38 refers to the charging system wiring diagram on page Referring to the wiring diagram: the charge indicator light of this vehicle does not come on when the ignition is in the ON position and the engine is turned off. Which of the following statements concerning this problem is true? A. The 10-ohm resistor inside the voltage regulator may be open. B. The field relay contacts may be stuck closed. C. The rotor winding may be shorted. D. The 50-ohm resistor may be open. NOTE: Question 39 refers to the two-speed wiper circuit on page The low-speed position of the windshield wiper system is inoperative; the high-speed position is working fine. Technician A says circuit 58 may be open. Technician B says circuit 63 may be open. NOTE: Question 40 refers to the blower motor circuit on page The medium-hi speed of the blower motor circuit 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. NOTE: Question 41 refers to the power window circuit on page

6 Appendix A ASE PRACTICE EXAMINATION 41. The power window motor in the wiring diagram is completely inoperative. With the master window placed in the DOWN position, the following voltages are measured at each terminal: Terminal # Voltage 1 12 V 2 0 V 3 12 V 4 0 V 5 12 V 6 12 V 7 0 V 8 12 V 9 0 V V 11 0 V Which of the following statements represents the cause of this problem? A. The master is faulty. B. The window is faulty. C. The motor is faulty. D. There is a poor ground in the circuit. NOTE: Question 42 refers to the body computer on page The liftgate ajar lamp is remaining on even after the liftgate is closed. Voltage at BCM terminal J2-4 is 0.0 volts. Technician A says that the BCM may be faulty. Technician B says that the liftgate may need to be replaced. 43. A Chrysler multiplex system is being discussed. Technician A says a voltmeter connected to the Bus + of any multiplexed component should indicate 12 volts with the ignition in the ON position. Technician B says a 12-volt test light can be used to test for power at various multiplexed components. 44. Sweep testing a potentiometer with a voltmeter and an ohmmeter is being discussed. Referring to a voltmeter, Technician A says that the positive lead should be connected to the feedback terminal and that the negative lead should be connected to the ground terminal. Referring to an ohmmeter, Technician B says that the positive lead should be connected to the feedback terminal and that the negative lead should be connected to the reference terminal. NOTE: Question 45 refers to the diagnostic chart on page The diagnostic chart is being used to troubleshoot a GM vehicle that has a current diagnostic trouble code 24 stored in memory. The ECC display panel is indicating the correct vehicle speed. Which of the following represents the probable cause of the trouble code? A. Open circuit 437. B. Faulty speedometer gear. C. Faulty vehicle speed sensor. D. Possible ECM problem. NOTE: Question 46 refers to the Ford illuminated entry system on page

7 Appendix A ASE PRACTICE EXAMINATION 46. The illuminated entry system is inoperative; neither the right nor the left outer door handle will activate the system. The courtesy lights and each lock cylinder LED will operate when the courtesy lamp is turned on. Which of the following represents the possible cause of this problem? A. Open in circuit 54. B. Short to ground in circuit 465. C. Open in circuit 57. D. Short to ground in circuit 54. NOTE: Question 47 refers to the instrument cluster schematic on page The electronic instrument cluster is totally inoperative; none of the display segments will illuminate. Technician A says there may be an open in circuit 389. Technician B says circuit 151 may be open. 48. The ambient temperature sensor of a vehicle equipped with an automatic A/C system is being tested. The resistance of the sensor is about 1 K ohms. Technician A says the sensor is out of range and needs to be replaced. Technician B says the temperature of the sensor needs to be known before it can be accurately tested. 49. Air bag module replacement is being discussed. Technician A says the negative battery cable should be disconnected at the beginning of the repair. Technician B says the reserve energy should be allowed to dissipate after the SIR fuse is removed. NOTE: Question 50 refers to the GM electronic sunroof circuit on page The electric sunroof of the vehicle will close but not open. All of the following could be the cause of this problem except: A. Open wire between the open relay and the motor. B. Faulty open relay load circuit contacts. C. Faulty control. D. Open wire between the control and the open relay. 695

8 696 QUESTION 11 Horn circuit.

9 QUESTION 12 Rear wiper/washer circuit. 697

10 + panel 10 A 15 A Headlight circuit breaker Headlight Exterior light Off Park Head Off Head Park Instrument panel illumination dimmer Dome To courtesy lights Headlight Courtesy light To headlight dimmer To exterior lights To illumination lights panel QUESTION 34 Headlight circuit. To courtesy lights 698

11 (V is fusible link black) 10 A 10 A Extended storage (Theft warning system power source) Theft warning indicator lamp (at combination warning lamp) A B Starting system ST Interrupt relay (theft warning) ON or ST 10 A Horn system D + Right Horn Starter motor M Left Horn Horn relay To horn L Output (V is fusible link brown) 15 A Lighting system (headlamp flashing phase for details, refer to EL section) 15 A Retract relay-up To retract control relay Theft warning subcontrol amp Combination (light) A. B. C. Lighting lever pushing position Lighting lever neutral position Lighting lever pulling position 2nd 1st Off CBAC AC A B B To lighting system (headlamp flashing operation) To passing timer Theft warning main control amp a b c d e f g h i j m M P QUESTION 35 Multifunction schematic. 699

12 terminal of starter relay + link Black/orange Alternator Sta. Bat. Stator terminal Stator windings Alternator output terminal White-black stripe Diode rectifiers Accessory terminal Charge indicator light 15 ohms I Yellowwhite dot A+ S F Green-red stripe Voltage limiter Field relay 0.04 ohms 10 ohms 50 ohms Regulator 14 ohms Rotating field Fld. Field terminal Orange/lt. blue Electric choke heater Slip rings QUESTION 38 Charging system wiring diagram. 700

13 Hot in ACCY or RUN 12 6 A block Off Lo Hi Wiper Off Lo Hi Washer Windshield wiper/ washer solution R B H L P W 63 R 56 DB/O 58 W 28 BK/PK 941 BK/W 63 R 56 DB/O 58 W 28 BK/PK 941 BK/W C201 C DB 58 W 28 BlK C311 Washer pump 63 R M Park Run Wiper motor and 57 BK G402 S BK QUESTION 39 Two-speed wiper circuit. 701

14 S BK F9 30= amp fuse 57 BK Hi Med= hi Med= low C613 (A or B) Low Off Blower C613 (A or B) panel 181 BR/O 261 O/BK 752 Y/R(D) 754 LG/W(H) 260 R/O(H) C002 C606 Blower motor Thermal limiter Blower motor resistor C002 Orange C001 Black QUESTION 40 Blower motor circuit. B Window 1 Down 8 Up 9 Up Motor Down 3 M 4 Master QUESTION 41 Power window circuit. 702

15 Bus + Bus Driver door jamb Driver door ajar Seat belt Key in ignition Low washer fluid Driver & passenger door handles Passenger door ajar Side door ajar Liftgate ajar 4/2 wheel drive Park brake Cluster ID high Low oil pressure Cluster ID low Fuel level Oil pressure level Engine temperature level 1/wipe power L Windshield wiper motor H M Dwell (Bus +) D1 VT/BR (Bus ) D2 WT/BK G16 BK/LB G75 TN G10 LG/RD G26 LB G29 BK/TN M22 WT G74 TN/RD G76 TN/YL G78 TN/BK G42 DB/YL G11 WT/BK D14 LB G6 GY D13 OR/DB G4 DB G60 GY/YL G20 VT/YL V6 DB V7 DG/WT V5 DG J1-14 J1-15 J1-1 J1-2 J1-3 J1-4 J1-5 J1-7 J2-2 J2-3 J2-4 J2-5 J2-9 J2-10 J2-21 J2-24 J1-10 J2-22 J2-25 J1-22 J1-24 J1-20 Body controller J1-12 J1-16 J2-17 J2-20 J1-19 J1-25 J1-6 J1-8 J2-15 J2-19 J1-17 J1-21 J2-8 J1-11 J1-9 J2-14 J1-13 J2-13 Z2 BK/LG G5 DB/WT M1 PK L2 LG P35 OR/VT M51 YL/RD M2 YL E17 YL/BK E92 OR/BK L94 OR/BK Q33 BR/LB P38 OR/WT G13 DB/RD G9 GY/BK V10 BR 300K V9 DG/YL L60 TN L61 TN IOD Headlamps low beam Power door lock Step dimmer Key in lamp Courtesy lamp 10 K Panel lamps level 10 K Headlamp time delay relay Liftgate interlock relay Seat belt Park brake Windshield washer Right turn signal Left turn signal 1/wipe level 1K Combo flasher Auto door lock J1 = Blue 25-way connector J2 = Natural 25-way connector QUESTION 42 Body computer inputs and outputs. 703

16 Key On enter diagnostics Note all diagnostic codes present Code E24 history See note on intermittents Code E24 current Perform ECM test (engine running) Does E.7.8 pass? Yes A No Check fuse 5 on relay center Does speedometer work properly? OK blown Yes No Refer to speedometer diagnosis in section 8C Repair open in circuit 639 Repair short in circuit 639 replace fuse 1 Lift drive wheels Place transmission in drive; allow wheels to turn Observe ECM data P.1.2 Reads actual speed Reads 0 mph Confirm that E24 is current If E24 is current (not history), see ECM replacement check, chart C-1, section 6E 2 Back probe speed bufer pin E with a voltmeter to ground Place transmission in drive; allow wheels to turn Voltage varies 6.0 to 11 volts Voltage does not vary Back probe ECM terminal C8 with a voltmeter to ground Transmission in drive; allow drive wheels to turn Terminal contact of buffer pin E If contact is OK, replace buffer Voltage varies 6.0 to 11 volts Check terminal contact of ECM pin C8 If terminal contact is good, see ECM replacement check, chart C-1, section 6E Voltage does not vary Repair open circuit 437 When all diagnoses and repairs are completed, clear codes and verify operation. QUESTION 45 Diagnostic chart. 704

17 Courtesy lamp WT/LT B LT. G-Y W-P 53 BK/LT B BK Actuator assembly illuminated entry 13C718 Left hand door latch Right hand door latch Left hand LED illuminated lock cylinder Vehicle courtesy lamps Dropping resistor Right hand LED illuminated lock cylinder QUESTION 46 Ford Illuminated entry system diagram. 705

18 Hot at all times 0.8 OR amp 240 See power distribution Hot in RUN 2 BN S amp 50 block C2 0.8 LT/BL C2 811 English/ metric input Body computer module (BCM); solid state; do not measure resistance E4 0.8 OR/BK C200 See fuse block details BN 50 E9 C200 S241 1 BN 50 1 BN 50 See fuse block details Headlights 1 LTGN 11 Interior lights dimming 0.5 GY GY/WT Body computer module (BCM) GY/WT ON/BK Body computer module (BCM) OR/BK 716 B1 0.5 LT/BL 811 C200 C J L G H M E C2 Headlights hi beam Incandescent light dimming Vacuum fluorescent (VF) dimming input +16 volts input English English/ metric Metric Instrument cluster printed circuit M/E English/metric Kilometers/miles MPH Km/h Trip Set Speedometer Export strap Ground D 0.5 DKGN D6 0.5 DKGN C200 F C1 A C C2 Vehicle speed output 0.8 YL T 0.8 BK/LTGN 400 4,000 pulses per mile 150 C2 (Not used) Sensor input 0.8 PL 401 Vehicle speed sensor Vehicle speed sensor buffer See ground distribution BK 2 BK A5 3 BK C1 (without S.I.R.) C1 (with S.I.R.) S242 C200 S BK 151 Without S.I.R. N See ground distribution C2 With S.I.R. 1 BK/YL BK/YL BK/YL BK/WT 751 S204 F3 C200 S218 3 BK 150 G200 1 BK/WT 751 C210 See ground distribution A QUESTION 47 Instrument cluster schematic. G100/G

19 Limit B PK A PK BK A B C Circuit board Close relay Open relay Timing module B A M YL RD PK E LTGN A C D BK/DKBL/WT B Control QUESTION 50 GM electronic sunroof diagram. 707

Automotive Parts. Charging & Starting Systems

Automotive Parts. Charging & Starting Systems Automotive Parts Charging & Starting Systems Charging Systems Output voltage kept to about 2 volts higher than battery voltage Controlled by varying current into rotor field winding (voltage regulator