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Symptom: *NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC POSSIBLE CAUSES CHECK PCM POWERS AND GROUNDS PCM SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE PCM SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE PCM SCI CIRCUITS SHORTED TOGETHER PCM SCI TRANSMIT CIRCUIT SHORTED TO GROUND PCM SCI RECEIVE CIRCUIT SHORTED TO GROUND PCM SCI RECEIVE CIRCUIT OPEN PCM SCI TRANSMIT CIRCUIT OPEN POWERTRAIN CONTROL MODULE TEST ACTION APPLICABILITY 1 Perform the symptom Checking PCM Power and Ground Circuits in the Driveability t in the generic scan tool mode, attempt to commu- nicate with the PCM. t can communicate with the PCM in the generic scan tool mode, it may not be necessary to perform this step. All Yes → Go To 2 No → Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 1. 2 Turn the ignition off. t from the DLC. Disconnect the PCM harness connectors. All Yes → Repair the PCM SCI Transmit circuit for a short to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 1. No → Go To 3 3 Turn the ignition off. t from the DLC. Disconnect the PCM harness connectors. All Yes → Repair the PCM SCI Receive circuit for a short to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 1. No → Go To 4 110 COMMUNICATION |