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Inspection And Verification




COMMUNICATIONS NETWORK - INSPECTION AND VERIFICATION

1. Verify the customer concern.

2. Visually inspect for obvious signs of electrical damage.

- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

Visual Inspection Chart





3. Connect the scan tool to the Data Link Connector (DLC).
NOTE:Make sure to use the latest scan tool software release.
NOTE:The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
If the Integrated Diagnostic System (IDS) does not communicate with the VCM:

- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- See Pinpoint Test 14: No Power To The Scan Tool.

4. Establish a scan tool session.
NOTE:The scan tool first attempts to communicate with the PCM, after establishing communication with the PCM, the scan tool then attempts to communicate with all other modules on the vehicle.
If an IDS session cannot be established with the vehicle, (IDS may state "No communication can be established with the PCM"):

- Choose "NO" when the scan tool prompts whether or not to retry communication.
- Enter either a PCM part number, tear tag or calibration number to identify the vehicle and start a session (the PCM part number and 4-character tear tag are printed on the PCM label).
- See Pinpoint Test 1: The PCM Does Not Respond To The Scan Tool.

5. Carry out the network test.

- If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
- If the network test fails, see CAN Communication Network to diagnose the failed communication network.
- If a module fails to communication during the network test, see CAN Communication Network.

6. Retrieve and review the DTCs.

- If the DTCs retrieved are related to the concern, go to DTC Charts. Follow the non-network DTC diagnostics (B-codes, C-codes, P-codes) prior to the network DTC diagnostics (U-codes). For all other DTCs, see - Diagnostic Trouble Code (DTC) Chart - B, C And U Codes.
- If no DTCs related to the concern are retrieved, see CAN Communication Network.

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