1. Install the scan tool.
2. Turn ON the scan tool.

Does the scan tool turn ON?

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Go to Step 7

Go to Step 2

1. Disconnect the scan tool from the data link connector (DLC).
2. Test for voltage at DLC terminal 16.

Is the measured voltage within the specified value?

11 - 13 V

Go to Step 4

Go to Step 3

Locate and repair an open in the DLC power circuit.

Is the repair complete?

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Go to Step 6

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1. Measure the resistance between DLC terminal 4 and ground.
2. Measure the resistance between DLC terminal 5 and ground.

Is the resistance for both terminals within the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

Locate and repair an open in the DLC ground circuit.

Is the repair complete?

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Go to Step 6

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Verify scan tool operation.

NOTE: The scan tool may be malfunctioning if it continues not to operate properly, refer to the scan tool instruction manual.

Did you obtain a properly operating scan tool?

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Go to the applicable Diagnostic System Check

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1. Problem is not current at this time.
2. Inspect for poor connections/terminal tension at the DLC terminals 4 and 16. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to the applicable Diagnostic System Check

Go to Step 6