On-board Diagnostics (Obd)

30 Questions | Total Attempts: 4182

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Vehicle Quizzes & Trivia

On board diagnostics system is an inbuilt system in cars to detect problems for repair. The quiz below is set to help drivers and mechanics better understand how the system works. Take advantage and learn. Enjoy!


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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.

  • 26. 
    Tech A says that many actuators operate on voltages supplied by the system computer. Tech B says that actuators may operate on at voltages other than battery voltage. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 27. 
    Which of these is the best place to start gathering information and planning a diagnostic pathway based on suspected systems and components?
    • A. 

      The owner's manual

    • B. 

      Diagnostic trouble codes (DTCs) and customer information

    • C. 

      The service manual

    • D. 

      Technical service bulletins

  • 28. 
    Tech A says that a graphing multimeter may be used to verify signals going to and from electrical and electronic components. Tech B says that digital storage oscilloscope may be used to verify signals going to and from electrical and electronic components. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 29. 
    Electrical circuits in the on-board diagnostics (OBD) system are being diagnosed. Tech A says that it's important to check for voltage drops on the power side of the circuit. Tech B says that it's important to check for voltage drops at the circuit ground connections. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 30. 
    A scan tool detects a communications fault in the controlled area network bus (CAN-bus). Which of these diagnostic trouble codes (DTCs) would MOST likely be stored?
    • A. 

      P0402

    • B. 

      U0021

    • C. 

      B0092

    • D. 

      C0035