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