Did you perform the Data Link Communications System Check?

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Go to Step 2

Go to Data Link Communications System Check

1. Connect the scan tool to another vehicle of the same model and year in order to ensure proper operation of the scan tool.
2. Turn the ignition switch to the RUN position.
3. Attempt to establish communication with the vehicle.

Does the scan tool communicate with the vehicle?

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Go to Step 4

Go to Step 3

The scan tool may be malfunctioning. Refer to the scan tool instruction manual in order to ensure that the scan tool is functioning.

Does the scan tool operate properly?

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Go to Data Link Communications System Check

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1. Connect the scan tool to the original vehicle.
2. Verify that the scan tool connections are clean and tight.

Is the terminal contact between the data link connector (DLC) and the scan tool OK?

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Go to Step 6

Go to Step 5

Repair the terminal contact between the scan tool and the DLC.

Did you complete the repair?

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Go to Data Link Communications System Check

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Measure the voltage between the DLC terminal 16 and ground.

Does the voltage measure in the specified range?

10-15 V

Go to Step 8

Go to Step 7

Repair the open or short to ground in CKT 40 (ORN).

Did you complete the repair?

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Go to Data Link Communications System Check

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Measure the voltage between the DLC terminal 16 and terminal 5.

Does the voltage measure in the specified range?

10-15 V

Go to Step 10

Go to Step 9

Repair the open in CKT 451 (BLK/WHT).

Did you complete the repair?

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Go to Data Link Communications System Check

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Repair the open in CKT 1250 (BLK).

Did you complete the repair?

Go to Data Link Communications System Check