AIO Fil7

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1. Which of the following is not a condition under which the malfunction indicator light (MIL) or service engine light is turned off?
A. Criteria for the PCM to clear codes is reached
B. Vehicle battery is disconnected
C. Powertrain control module (PCM) link is grounded
D. DTCs are cleared bya scan tool2. Technician A says that nonemission-related codes that make the malfunction indicator lamp (MIL) illuminate are called “Type A” codes. Technician B says that emission-related codes that illuminate the MIL after the first fault are called “Type A” codes. Who is correct?
A. Technician A
B. Both Technicians A and B
C. Technician B
D. Neither Technician A nor B3. 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. Neither Technician A nor B
C. Technician A
D. Both Technicians A and B4. 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. Neither Technician A nor B
B. Technician A
C. Both Technicians A and B
D. Technician B5. A U-type diagnostic trouble code (DTC) indicates a problem with the
A. engine or transmission.
B. chassis.
C. body.
D. network.6. 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. Both Technicians A and B
C. Neither Technician A nor B
D. Technician B7. 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. Neither Technician A nor B
B. Technician B
C. Both Technicians A and B
D. Technician A8. Which of the following is least likely checked by the comprehensive component monitor?
A. Rationality
B. Shorts-to-power
C. Shorts-to-ground
D. Opens9. 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. Both Technicians A and B
B. Neither Technician A nor B
C. Technician B
D. Technician A11. What OBD-II term applies when all enabling standards for a specific diagnostic trouble code (DTC) are met?
A. Well-tuned engine
B. Freeze frame
C. Trip criteria
D. Warmed-up engine12. Which of the eight diagnostic steps for locating an engine performance problem is performed first?
A. Check for any technical service bulletins (TSBs).
B. Check for any stored diagnostic trouble codes (DTCs).
C. Verify the concern or complaint.
D. Perform a thorough visual inspection.13. You’re diagnosing a hard-starting vehicle and installing a fuel pressure gauge. When the engine is shut off, the fuel pressure drops rapidly. Technician A says that a fuel injector could be leaking. Technician B says that the fuel pump may have a defective check valve. Who is correct?
A. Both Technicians A and B
B. Technician B
C. Neither Technician A nor B
D. Technician A14. 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. Neither Technician A nor B
B. Technician A
C. Technician B
D. Both Technicians A and B15. 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 O2 sensor.
B. low fuel-pump pressure.
C. a defective powertrain control module (PCM).
D. an opening in the O2 sensor signal wire.16. 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