Automotive Exam 5

Question Description

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

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. Technician B

B. Both Technicians A and B

C. Technician A

D. Neither Technician A nor B

Technician A says that on-board self-diagnostics test mode procedures should be conducted on a cold engine. Technician B says that many diagnostic trouble codes (DTCs) will monitor items only when the engine control system is in closed loop. Who is correct?

A. Technician A

B. Neither Technician A nor B

C. Technician B

D. Both Technicians A and B

An OBD-II vehicle fails an emission test with high CO and HC emissions. Technician A says that the cause may be low fuel pressure. Technician B says the cause may be a restricted return line on the fuel supply system. Who is correct?

A. Technician A

B. Technician B

C. Both Technicians A and B

D. Neither Technician A nor B

A U-type diagnostic trouble code (DTC) indicates a problem with the

A. network.

B. engine or transmission.

C. chassis.

D. body.

A misfire code is a type _______ diagnostic trouble code (DTC).

A. B

B. C

C. D

D. A

What OBD-II term applies when all enabling standards for a specific diagnostic trouble code (DTC) are met?

A. Well-tuned engine

B. Warmed-up engine

C. Trip criteria

D. Freeze frame

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. five key-on/key-off cycles.

D. two consecutive trips.

Technician A says that OBD-II systems include generic as well as vehicle manufacturer’s specific diagnostic trouble codes (DTCs) and scan data displays. Technician B says that OBD-II systems have common DTCs. Who is correct?

A. Technician A

B. Neither Technician A nor B

C. Both Technicians A and B

D. Technician B

Which of the following is least likely checked by the comprehensive component monitor?

A. Shorts-to-power

B. Rationality

C. Opens

D. Shorts-to-ground

All of the following items are important to know when diagnosing an engine drivability problem except for the

A. temperature of the engine when the problem occurs.

B. list of previous repairs.

C. brand of engine oil used.

D. type of gasoline used.

Technician A says that the last step in the diagnostic process is to verify the problem. Technician B says that the second step is to perform a thorough visual inspection. Who is correct?

A. Both Technicians A and B

B. Technician B

C. Technician A

D. Neither Technician A nor B

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. low fuel-pump pressure.

C. a defective O2 sensor.

D. an opening in the O2 sensor signal wire.

Technician A says that it’s a good idea to perform a test drive before attempting repairs. Technician B says that it’s a good idea to let the customer accompany you on the test drive. Who is correct?

A. Technician B

B. Neither Technician A nor B

C. Technician A

D. Both Technicians A and B

Which of the eight diagnostic steps for locating an engine performance problem is performed first?

A. Perform a thorough visual inspection.

B. Check for any stored diagnostic trouble codes (DTCs).

C. Check for any technical service bulletins (TSBs).

D. Verify the concern or complaint.

123u

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. Bad connection at splice F12

C. Open at powertrain control module (PCM) pin 13

D. Open at PCM pin 58

Technician A says that when the malfunction indicator light (MIL) or service engine light is on, you should retrieve the diagnostic trouble code (DTC) and follow the manufacturer’s recommended procedure. Technician B says that all OBD-II monitors must have the enable criteria achieved before a test is performed. Who is correct?

A. Technician B

B. Technician A

C. Both Technicians A and B

D. Neither Technician A nor B

Technician A says that generic scan tools must be able to read all generic OBD-II codes. Technician B says that all generic scan tools must be able to read manufacturer OBD-II trouble codes. Who is correct?

A. Both Technicians A and B

B. Technician A

C. Neither Technician A nor B

D. Technician B

All of these concerns can be diagnosed using the paper test except for a

A. burned valve.

B. cracked exhaust manifold.

C. faulty injector on a multiport engine.

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