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1.

Refer to "Shop Manual" and remove necessary parts to get access to ECM, TCM, PCM and other control units that connected to CCP-CAN Communication circuit.

2.

Connect GDS to Data Link Connector(DLC).

3.

Ignition "ON".

4.

Disconnect unit connector one after the other.

5.

Check for control unit causing the fault by communicating ECM, TCM,PCM and others with GDS.

6.

Does GDS able to communicate with any of systems when one unit connector is disconnected?

▶ Carefully re-do this troubleshooting guide steps.

▶ If problem still occurs, replace Control Unit that casuing the fault and then go to "Verification of Vechicle Repair" procedure.

▶ Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.