Question 1

Which tool should be used on Ford OBD I systems to retrieve DTCs if the STAR tester is NOT available?&#10;A)Continuity tester&#10;B)Digital voltmeter&#10;C)Analog voltmeter&#10;D)None of these are correct

Accepted Answer

An analog voltmeter can be used to retrieve Diagnostic Trouble Codes (DTCs) on Ford OBD I systems when a STAR tester is not available, as it can interpret the voltage pulses representing the codes.

Question 2

Which pins of the DLC should be connected in order to retrieve &#34;flash&#34; codes from a GM OBD I PCM?&#10;A)A and C&#10;B)D and E&#10;C)A and D&#10;D)A and B

Accepted Answer

A and B&#10;

Question 3

What is the first step of the diagnosis process?&#10;A)Retrieve the diagnostic trouble codes&#10;B)Verify the problem&#10;C)Check for technical service bulletins&#10;D)Look at scan tool data

Accepted Answer

Verifying the problem is the first step in the diagnosis process. This involves confirming the issue that has been reported to ensure that the diagnostic process addresses the correct problem.

Question 4

Which step should be performed LAST when diagnosing an engine performance problem?&#10;A)Verifying the repair&#10;B)Checking for any technical bulletins&#10;C)Checking for any stored diagnostic trouble codes&#10;D)Performing a thorough visual inspection

Accepted Answer

Verifying the repair is the last step in diagnosing an engine performance problem because it confirms that the issue has been successfully addressed and that the engine is performing correctly after all other diagnostic steps have been completed.

Question 5

The preferred method to clear diagnostic trouble codes (DTCs) is to ________.&#10;A)Use a scan tool&#10;B)Cycle the ignition key on and off 40 times&#10;C)Disconnect the negative battery cable for 10 seconds&#10;D)Remove the computer (PCM) Power feed fuse

Accepted Answer

Using a scan tool is the preferred method to clear diagnostic trouble codes (DTCs) because it allows for a controlled reset of the system without risking the loss of other important system settings or data. Cycling the ignition, disconnecting the battery, or removing fuses can cause loss of memory to other systems and is not recommended for clearing DTCs.

Deck 88: Scan Tools and Engine Performance Diagnosis