1. 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. Both Technicians A and B
C. Neither Technician A nor B
D. Technician B
2. 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. five key-on/key-off cycles.
B. eighty warm-up cycles.
C. two consecutive trips.
D. the criteria to clear codes is reached
3. An OBD-II system interprets a disconnected spark plug as a misfire that could damage the three-way catalyst. The ECM or PCM will most likely trigger the malfunction indicator lamp (MIL) on the _______ trip.
A. first
B. second
C. fourth
D. third
4. 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. Both Technicians A and B
B. Neither Technician A nor B
C. Technician B
D. Technician A
5. A misfire code is a type _______ diagnostic trouble code (DTC).
A. C
B. A
C. D
D. B
6. 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.
7. The first character of a diagnostic trouble code (DTC) indicates the vehicle system. Which one of the letters below refers to the chassis and transfer cases?
A. P
B. U
C. B
D. C
8. All of these concerns can be diagnosed using the paper test except for a
A. cracked exhaust manifold.
B. bad spark plug wire in the ignition system.
C. burned valve.
D. faulty injector on a multiport engine.
9. 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. Both Technicians A and B
B. Neither Technician A nor B
C. Technician B
D. Technician A
10. Which of the following is least likely checked by the comprehensive component monitor?
A. Opens
B. Shorts-to-power
C. Rationality
D. Shorts-to-ground
11. 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. Technician A
B. Technician B
C. Neither Technician A nor B
D. Both Technicians A and B
14. 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
15. A U-type diagnostic trouble code (DTC) indicates a problem with the
A. body.
B. chassis.
C. network.
D. engine or transmission.
17. 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 A
B. Technician B
C. Neither Technician A nor B
D. Both Technicians A and B
19. Technician A says that you must use the OEM factory scan tool to flash the electronically erasable programmable only memory (EEPROM) on an engine control module (ECM) or powertrain control module (PCM), along with the J2534 tool. Technician B says that reprogramming a PCM using the J2534 system requires access to the Internet. Who is correct?
A. Technician B
B. Technician A
C. Both Technicians A and B
D. Neither Technician A nor B
20. 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. Neither Technician A nor B
B. Technician B
C. Technician A
D. Both Technicians A and B
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