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Motor Age Garage Test #488 7/04

Thursday, July 1, 2004 - 00:00

MOTOR AGE GARAGE TEST 488 7/04
2000 Ford F-150 with "Service Engine" light on.

1. A defective thermostat can:
A. Stick closed. 
B. Stick open. 
C. Open too slowly or too quickly. 
D. All of the above.

2. Voltage drop must be checked:
A. With the circuit under load. 
B. With the power removed from the circuit. 
C. With the ground removed from the circuit. 
D. With an ohmmeter.

3. In order to properly check the voltage drop across a ground circuit you should:
A. Place the negative ohmmeter lead on the ground side of the circuit being tested and the positive lead on the positive battery terminal.
B. Place the negative ohmmeter lead on the negative battery post and the positive lead on the ground connection at the head end of the circuit being tested.
C. Place the negative ohmmeter lead on the negative battery post and the positive lead on the power side of the circuit being tested.
D. None of the above.

4. In order to properly check the voltage drop across a power circuit you should:
A. Place the positive voltmeter lead on the positive side of the circuit being tested and the negative lead on the negative battery post.
B. Place the positive voltmeter lead on the positive battery post and the negative lead on the power connector at the head end of the circuit being tested.
C. Place the positive voltmeter lead on the positive battery post and the negative lead on the ground side of the circuit being tested.
D. None of the above.

5. When diagnosing with a scan tool you need to remember:
A. That a poor ground connection can cause a glitch.
B. That a poor power connection can cause a glitch.
C. That certain scanner/vehicle combinations may not provide accurate readings.
D. All of the above.

6. In theory, voltage drop across an electronic circuit should be:
A. No more than 1 volt. 
B. No more than 0.5 volt. 
C. No more than 0.125 volt. 
D. 0.0 volt

7. In the real world, voltage drop across an electronic circuit should be:
A. No more than 1 volt. 
B. No more than 0.5 volt. 
C. No more than 0.125 volt. 
D. 0.0 volt.

8. When diagnosing an OBD II system with a complaint of the MIL on, the first thing that you should do is:
A. Check and clear the codes and freeze frame data. 
B. Check, but not clear the codes and freeze frame data.
C. Check the voltage drop across the grounds and powers. 
D. Check for TSBs applicable to the MIL.

9. A loose piece of carbon in a cylinder can:
A. Short out a spark plug. 
B. Cause a knocking noise in the engine. 
C. Hold a valve open. 
D. All of the above.

10. When checking the voltage drop across a connector, Technician A says to put one ohmmeter lead on one side of the connector and the other lead on the other side of the connector with the circuit powered up. Technician B says to put one voltmeter lead on one side of the connector and the other lead on the other side of the connector with the circuit dead. Who is right?
A. Technician A 
B. Technician B 
C. Both A and B 
D. Neither A nor B

Answers to these test questions
will be made available online September 15, 2004.

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