Courtesy of Chrysler Corporation
2. The above wiring diagram is from a vehicle with a misfire diagnostic trouble code (DTC) for number 4 cylinder. Which of the following is the most likely cause?
A. Bad connection at splice A142
B. Open at powertrain control module (PCM) pin 13
C. Bad connection at splice F12
D. Open at PCM pin 58
5. What type of scan tool is shown in the above photograph?
A. Factory scan tool
B. Laptop computer adapter
C. Generic scan tool
D. Bluetooth interface
10. A vehicle fails an HC emission test at idle and 2,500 rpm, and the engine has an acceleration stumble. The heated oxygen sensor (HO2S) voltage is 0.1–0.3 volts on a scan tool, and the injector pulse width is high. No diagnostic trouble codes (DTCs) are found. When propane is directed into the air intake, HO2S voltage immediately increases and the injector pulse width decreases. The most likely cause of this problem is
A. a defective powertrain control module (PCM).
B. an opening in the O2 sensor signal wire.
C. a defective O2 sensor.
D. low fuel-pump pressure.
11. An engine you're servicing has electronically controlled cooling fans. Cooling fan 1 doesn't work but cooling fan 2 does. Which of the following could be the cause?
A. Short at circuit 339, pink/black wire
B. Open at ECM Terminal A9
C. Open at ECM Terminal A3
D. Short at circuit 67, light blue wire
12. The powertrain control module (PCM) or engine control module (ECM) will automatically clear a diagnostic trouble code (DTC) if there are no additional faults detected after
A. eighty warm-up cycles.
B. the criteria to clear codes is reached.
C. two consecutive trips.
D. five key-on/key-off cycles.
13. Technician A says that a new replacement part is always good. Technician B says that sometimes recent repair work will be the cause of a complaint. Who is correct?
A. Both Technicians A and B
B. Technician B
C. Technician A
D. Neither Technician A nor B
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