Did you perform the Data Link Communications Systems Check?

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Go to Step 2

Go to Data Link Communications System Check

1. Inspect the data link connector (DLC). Repair any damaged terminals if required.
2. Verify that the Scan Tool is firmly installed.
3. Turn the ignition switch to the RUN position.
4. Attempt scan tool communications with the vehicle control module (VCM) for gasoline engines, or the powertrain control module (PCM) for diesel engines.

Can communications be established?

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System OK

Go to Step 3

1. Turn the ignition switch to the OFF position.
2. Disconnect the PCM connector C3 or the VCM connector C4.
3. Disconnect the electronic brake control module (EBCM).
4. Use a J 39200 DMM in order to measure the resistance on the DLC from terminal 2 to terminal 5.

Is the resistance greater than the specified value?

10M ohms

Go to Step 5

Go to Step 4

Locate and repair the short to ground in CKT 1807 (PPL).

Did you complete the repair?

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System OK

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Use a J 39200 DMM in order to measure the voltage on the DLC from terminal 2 to terminal 5.

Is the voltage greater than the specified value?

1.0 V

Go to Step 6

Go to Step 7

Locate and repair the short to B+ in CKT 1807 (PPL).

Did you complete the repair?

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System OK

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Use a J 39200 DMM in order to measure the resistance from the DLC terminal 2 to the PCM connector C3, cavity C8, or to the VCM connector C4, cavity 11.

Is the resistance greater than the specified value?

1.0 ohms

Go to Step 8

Go to Step 9

Locate and repair the open in CKT 1807 (PPL).

Did you complete the repair?

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System OK

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1. Connect the PCM or VCM.
2. Connect the EBCM.
3. Turn the ignition switch to the RUN position.
4. Install the scan tool.
5. Attempt to communicate with the PCM or VCM.

Can communications be established?

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System OK

Go to Step 1