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Symptom: *NO RESPONSE FROM ECM AND PCM (DIESEL ONLY) POSSIBLE CAUSES CHECK ECM/PCM 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 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 → 27 COMMUNICATION |