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

  • OBD-II
  • SAE J1979
  • ISO 15031
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Quizzes Created: 39 | Total Attempts: 148,538
| Attempts: 18,841 | Questions: 30 | Updated: Mar 22, 2023
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1. Automotive emissions cause harm to all of these EXCEPT:

Explanation

Modern technology is not harmed by automotive emissions.

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

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.... see moreTake advantage and learn. Enjoy! see less

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

Explanation

Always start with customer experiences, reading DTC's, and driving the vehicle yourself to confirm these experiences.

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3. To ensure that a vehicle malfunction is identified and repaired correctly, always follow

Explanation

The best, most accurate and up-to-date information for servicing vehicles is found in the OEM diagnostic flow charts.

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

Explanation

Constant binary code is shared between control modules.

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

Explanation

A scanner links to a vehicle and gets important, DTC/MIL related information.

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

Explanation

1996 is the year of OBDII implementation.

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7. A drive cycle includes all of these EXCEPT:

Explanation

Cold soak is when an engine sits without running, until it is as cold as the ambient temperature.

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

Explanation

The PCM or ECM are responsible for monitoring and storing engine related processed and faults.

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9. Harmful tailpipe emissions include all of these EXCEPT:

Explanation

O2 is a naturally occurring, non-harmful emission.

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10. Fault codes on today's vehicles are categorized by vehicle:

Explanation

In contemporary vehicles, DTC's are categorized by system.

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11. 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?

Explanation

"U" is the designation for communication faults.

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

Explanation

Leaving a controller hooked up when jumping to power to operate an actuator will allow the current to potentially also go into the controller.

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

Explanation

The DLC is the interface between the vehicle and the scan tool.

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14. 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?

Explanation

Conditions that are outside preprogrammed values causes the DTC/MIL to illuminate. The test procedure for every vehicle is not the same.

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

Explanation

A DTC will get you headed in the correct direction, but a technician must confirm that a part is broken before replacing it.

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16. 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?

Explanation

All OEM offer their own, proprietary scan tools that most often offer the greatest functionality for advanced testing and inspecting of DTC related concerns.

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17. A fault code that begins with the letter "P" would MOST likely address a fault in the:

Explanation

The "P" in the DTC indicates a fault in the powertrain system.

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18. 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:

Explanation

Some States may allow a vehicle with an emissions monitor that has run and not failed, a pass on state regulated emissions.

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19. 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?

Explanation

Both of the listed tools can be used to verify electrical signals, but the oscilloscope is a much more sophisticated piece of diagnostic equipment.

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20. 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?

Explanation

The voltage drop test is one of the most important electrical tests, and can be performed on any complete circuit.

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21. A fault code that begins with the letter "B" would MOST likely address a fault in the:

Explanation

The "B" in a MIL indicates that the concern is a body related fault.

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22. Continuous monitors are run for systems that could:

Explanation

Individual monitors are continuous and are subsystems of ECM/PCM processes.

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

Explanation

An illuminated MIL would indicate an emissions related fault that would cause excessive, out of compliance emissions.

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24. 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?

Explanation

Actuators are not only driver commanded. A controller may also operate actuators. These circuits, at times, may operate on voltages other than battery voltage.

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

Explanation

An accomplished technician still needs to run tests, and confirm any fault the vehicle "thinks" it may have.

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26. 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?

Explanation

If certain parameters are so out of whack. it may lead to multiple codes setting. An analog voltmeter is not something that is commonly used in the automotive trade.

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

Explanation

A test light does not give us sufficient information for these sophisticated concerns or issues.

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

Explanation

A CAN and its system of nodes and circuitry reduce the overall weight of vehicles.

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29. Which of these pollutants is caused by fuel or oil vapors?

Explanation

VOC's are the harmful emissions created by fuel AND oil.

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

Explanation

Freeze frame data are the conditions that were occurring when the DTC was set.

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Automotive emissions cause harm to all of these EXCEPT:
Which of these is the best place to start gathering information and...
To ensure that a vehicle malfunction is identified and repaired...
Which of these provides constant yet simplified interconnectivity...
Which of these is a device able to electronically communicate with and...
In what year was on-board diagnostics II (OBDII) systems enacted...
A drive cycle includes all of these EXCEPT:
Engine related freeze-frame data can be accessed from the...
Harmful tailpipe emissions include all of these EXCEPT:
Fault codes on today's vehicles are categorized by vehicle:
A scan tool detects a communications fault in the controlled area...
Never jump battery or power supply voltages to an actuator while it is...
On-board diagnostics II (OBDII) data are retrieved by connecting a...
Tech A says that the on-board diagnostics II (OBDII) system is...
A diagnostic trouble code (DTC) indicates that a vehicle has...
Tech A says that the original equipment manufacturer (OEM) offer scan...
A fault code that begins with the letter "P" would MOST likely address...
State-run emission inspection stations in the United States will...
Tech A says that a graphing multimeter may be used to verify signals...
Electrical circuits in the on-board diagnostics (OBD) system are being...
A fault code that begins with the letter "B" would MOST likely address...
Continuous monitors are run for systems that could:
A vehicle is known to be out of compliance with clean air regulations...
Tech A says that many actuators operate on voltages supplied by the...
On-board diagnostic (OBD) systems help the service tech do all of...
Tech A says that it is possible for a vehicle to have one fault that...
When it comes to troubleshooting an on-board diagnostic (OBD) code,...
Which of these has reduced the weight and expense of wire bundles in...
Which of these pollutants is caused by fuel or oil vapors?
Which of the following types of data helps a tech to determine the...
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