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Symptom: *NO RESPONSE FROM PCM (SCI ONLY) POSSIBLE CAUSES CHECK PCM POWERS AND GROUNDS SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE TRANSMISSION CONTROL MODULE SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE SCI CIRCUITS SHORTED TOGETHER SCI TRANSMIT CIRCUIT SHORTED TO GROUND SCI RECEIVE CIRCUIT SHORTED TO GROUND SCI RECEIVE CIRCUIT OPEN SCI TRANSMIT CIRCUIT OPEN GROUND CIRCUITS AT DLC OPEN POWERTRAIN CONTROL MODULE TEST ACTION APPLICABILITY 1 Perform the symptom Checking PCM Power and Ground Circuits in the Driveability All Yes → No → Repair as necessary. 2 Turn the ignition off. t from the DLC. Measure the resistance between ground and the SCI Transmit circuit. All Yes → No → 3 Turn the ignition off. All Yes → Repair the SCI Transmit circuit for a short to ground. No → Replace the Transmission Control Module. 145 COMMUNICATION |