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Symptom: *NO RESPONSE FROM ECM AND PCM (DIESEL ONLY) POSSIBLE CAUSES CHECK ECM POWERS AND GROUNDS POWERTRAIN CONTROL MODULE - SCI TRANSMIT SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE SCI CIRCUITS SHORTED TOGETHER SCI TRANSMIT CIRCUIT SHORTED TO GROUND SCI TRANSMIT CIRCUIT OPEN GROUND CIRCUITS AT DLC OPEN ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 Perform the symptom Checking ECM and PCM Power and Ground Circuits in the All Yes → No → Repair as necessary. 2 Turn the ignition off. All Yes → Replace and program the Powertrain Control Module in accor- No → 3 Turn the ignition off. All Yes → Repair the SCI Transmit circuit for a short to voltage. No → 163 COMMUNICATION |