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Symptom: P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO When Monitored and Set Condition: P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO EARLY When Monitored: During after-run. Set Condition: The internal ECM timer determines that the ECM/PCM Relay has shut off before the AFTER-RUN mode of operation. POSSIBLE CAUSES CHECK FOR OTHER DTCS INTERMITTENT CONDITION ECM/PCM RELAY ECM/PCM RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → Refer to the Symptom List and diagnose the other DTCs before continuing. No → Go To 2 2 NOTE: If the ECM detects and stores a DTC, the ECM also stores the All Yes → Go To 3 No → Go To 5 159 DRIVEABILITY - DIESEL |