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12-18

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Technician A says that both OBD I and OBD II systems will pinpoint a sensor that is operating poorly or incorrectly. Technician B says that OBD I will only indicate that a circuit is no longer operating properly. Who is correct?
a.
A only.
c.
Both A and B.
b.
B only.
d.
Neither A nor B.
 

 2. 

An OBD II system will identify problems with all the components listed, except:
a.
battery temperature sensor.
c.
oxygen sensor.
b.
ignition coil.
d.
starter solenoid.
 

 3. 

Trouble codes set by an OBD I system can be read manually by each of the following methods, except:
a.
counting flashes of the check engine light.
b.
counting deflections of the needle on an analog voltmeter.
c.
counting beeps of the vehicle’s horn.
d.
reading a digital display in a climate control panel.
 

 4. 

The data link connector for an OBD II system most often will be located:
a.
behind the front bumper.
b.
under the dash or center console, near the driver’s seat.
c.
behind the dash on the passenger’s side of the vehicle.
d.
on the firewall, inside the engine compartment.
 

True/False
Indicate whether the statement is true or false.
 

 5. 

OBD II requires all automotive manufacturers to use a set of standardized trouble codes.
 

 6. 

A scan tool is now the most important tool of the automobile technician.
 

 7. 

All vehicles with 16-pin data link connectors are OBD II compliant.
 

 8. 

Without a scan tool, it is not possible to recover trouble codes from an OBD II system.
 

 9. 

A modern scan tool allows the technician to monitor operating conditions while performing a test drive.
 

Matching
 
 
Match the following terms and identifying phrases.
a.
low-input failure
d.
improper range/performance failure
b.
soft failure
e.
hard failure
c.
general circuit failure
f.
high-input failure
 

 10. 

Problem that produces a voltage, current, or signal frequency below normal operating parameters.
 

 11. 

Problem that does not come and go with varying conditions.
 

 12. 

Problem in which the circuit has a fixed value, no output, or an output that is out of specifications.
 

 13. 

Problem that involves a sensor producing values slightly higher or lower than normal.
 

 14. 

Problem that occurs only intermittently.
 

 15. 

Problem that produces a voltage, current, or signal frequency above normal operating parameters.
 

Completion
Complete each statement.
 

 16. 

The on-board diagnostics system in older vehicles is referred to as ______________________________.
 

 

 17. 

On newer vehicles, a flashing malfunction indicator light warns of a problem that could damage the ______________________________.
 

 

 18. 

Some scan tool cartridges can be updated by ______________________________ new information from a computer.
 

 

 19. 

Modern scan tools provide step-by-step instructions called ______________________________.
 

 

 20. 

Key-on/engine-off diagnostics allow the technician to check for ______________________________.
 

 

 21. 

OBD II requires manufacturers to use a set of standardized ______________________________.
 

 

 22. 

Loose, dirty, or corroded electrical connections often can be found by using a(n) ______________________________ test.
 

 

 23. 

After system repairs are made, trouble codes should be ______________________________ to prevent a possible misdiagnosis by the next technician to work on the vehicle.
 

 

 24. 

______________________________ values produced by a vehicle’s computer give electrical operating values of sensors, actuators, and circuits.
 

 

 25. 

A(n) ______________________________ diagnostic test uses the scan tool to order the computer to energize specific output devices.
 

 



 
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