On-board Diagnostics (Obd) Quiz - Know More About Vehicles

30 Questions | Total Attempts: 12298

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On-board Diagnostics (Obd) Quiz - Know More About Vehicles

On-board diagnostics (OBD) is an automotive term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or repair technician access to the status of the various vehicle sub-systems. . The quiz below is set to help drivers and mechanics better understand how the system works. Take advantage and learn. Enjoy!


Questions and Answers
  • 1. 
    Automotive emissions cause harm to all of these EXCEPT:
    • A. 

      The air we breathe.

    • B. 

      The environment.

    • C. 

      Modern technology.

    • D. 

      Human health.

  • 2. 
    A vehicle is known to be out of compliance with clean air regulations whenever:
    • A. 

      It flunks a safety inspection.

    • B. 

      Its registration has expired.

    • C. 

      A red light is illuminated on the instrument panel.

    • D. 

      Its malfunction indicator lamp (MIL) is illuminated.

  • 3. 
    Which of these pollutants is caused by fuel or oil vapors?
    • A. 

      Volatile organic compounds (VOCs)

    • B. 

      Hydrocarbons (HCs)

    • C. 

      Carbon monoxide (CO)

    • D. 

      Particulate matter (PM)

  • 4. 
    Harmful tailpipe emissions include all of these EXCEPT:
    • A. 

      Carbon monoxide (CO).

    • B. 

      Hydrocarbons (HCs).

    • C. 

      Particulate matter (PM).

    • D. 

      Oxygen (O2).

  • 5. 
    Which of these has reduced the weight and expense of wire bundles in today's automobiles? 
    • A. 

      Aluminum wiring

    • B. 

      Shared circuits

    • C. 

      High-voltage circuits

    • D. 

      Controller area networks

  • 6. 
    In what year was on-board diagnostics II (OBDII) systems enacted nationwide?
    • A. 

      1973

    • B. 

      1981

    • C. 

      1975

    • D. 

      1996

  • 7. 
    Which of these provides constant yet simplified interconnectivity between on-board vehicle modules?
    • A. 

      Discreet wiring

    • B. 

      A controlled area network bus (CAN-bus)

    • C. 

      A scan tool

    • D. 

      A personal computer (PC)

  • 8. 
    A diagnostic trouble code (DTC) indicates that a vehicle has experienced all of these EXCEPT:
    • A. 

      An emissions related fault.

    • B. 

      A broken “hard part.”

    • C. 

      A broken “hard part.”

    • D. 

      An illuminated malfunction indicator lamp (MIL).

  • 9. 
    Engine related freeze-frame data can be accessed from the vehicle's:
    • A. 

      Electronic brake control module (EBCM).

    • B. 

      Transmission control module (TCM).

    • C. 

      Power train control module (PCM).

    • D. 

      Body control module (BCM).

  • 10. 
    Continuous monitors are run for systems that could:
    • A. 

      Contribute to major emissions failures.

    • B. 

      Cause a safety related problem.

    • C. 

      Cause an inconvenience for the driver.

    • D. 

      Cause other systems to fail.

  • 11. 
    A drive cycle includes all of these EXCEPT:
    • A. 

      Vehicle start-up.

    • B. 

      Vehicle acceleration.

    • C. 

      Vehicle cruise.

    • D. 

      Vehicle cold soak.

  • 12. 
    State-run emission inspection stations in the United States will sometimes allow a vehicle to pass an emission inspection under any of these situations EXCEPT:
    • A. 

      A monitor has run and failed.

    • B. 

      A monitor has run and is pending.

    • C. 

      One monitor has not run.

    • D. 

      Two monitors have not run.

  • 13. 
    Which of these is a device able to electronically communicate with and extract data from the vehicle's one or more on-board computers?
    • A. 

      An oscilloscope

    • B. 

      A scanner

    • C. 

      A graphing calculator

    • D. 

      A power probe

  • 14. 
    Tech A says that it is possible for a vehicle to have one fault that causes yet another fault to set a code. Tech B says that the test light, an analog voltmeter, and a logic probe are worthwhile diagnostic tools. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 15. 
    On-board diagnostics II (OBDII) data are retrieved by connecting a scan tool to the:
    • A. 

      Malfunction indicator lamp (MIL).

    • B. 

      Data link connector (DLC).

    • C. 

      Diagnostic trouble code (DTC).

    • D. 

      Power train control module (PCM).

  • 16. 
    Tech A says that the on-board diagnostics II (OBDII) system is designed to set fault codes if the vehicle exceeds the limits programmed within the vehicle system. Tech B says that the EPA Federal Test Procedure pass and fail points are the same for every vehicle. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 17. 
    To ensure that a vehicle malfunction is identified and repaired correctly, always follow
    • A. 

      Aftermarket service manuals.

    • B. 

      Original equipment manufacturer (OEM) diagnostic flow charts.

    • C. 

      Aftermarket training manuals.

    • D. 

      OEM owners' manuals.

  • 18. 
    When it comes to troubleshooting an on-board diagnostic (OBD) code, the tech's best tools include all of these EXCEPT:
    • A. 

      A test light.

    • B. 

      A digital volt-ohmmeter (DVOM).

    • C. 

      A lab scope.

    • D. 

      A scan tool.

  • 19. 
    Which of the following types of data helps a tech to determine the actual conditions under which a fault code is set?
    • A. 

      Technical service bulletin (TSB) data

    • B. 

      Diagnostic trouble code (DTC) data

    • C. 

      Service manual data

    • D. 

      Freeze-frame data

  • 20. 
    A fault code that begins with the letter “B” would MOST likely address a fault in the:
    • A. 

      Ignition system.

    • B. 

      Exhaust system..

    • C. 

      Taillight circuit.

    • D. 

      Transmission

  • 21. 
    A fault code that begins with the letter “P” would MOST likely address a fault in the:
    • A. 

      Exhaust system.

    • B. 

      Power door lock wiring.

    • C. 

      HVAC system.

    • D. 

      Interior lighting system.

  • 22. 
    Fault codes on today's vehicles are categorized by vehicle:
    • A. 

      System.

    • B. 

      Year.

    • C. 

      Make.

    • D. 

      Model.

  • 23. 
    On-board diagnostic (OBD) systems help the service tech do all of these EXCEPT:
    • A. 

      Work more efficiently.

    • B. 

      Determine exactly where faults exist.

    • C. 

      Take the guesswork out of diagnosing vehicle problems.

    • D. 

      Access data for today's sophisticated vehicles.

  • 24. 
    Tech A says that the original equipment manufacturer (OEM) offer scan tools to service their specific line of vehicles. Tech B says that scan tools supplied by aftermarket tool and equipment providers usually provide greater functionality. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 25. 
    Never jump battery or power supply voltages to an actuator while it is connected to its:
    • A. 

      Control circuit.

    • B. 

      Mother board.

    • C. 

      Mechanical linkage.

    • D. 

      Driven component.

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