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Symptom: P0115-TEMPERATURE OF ENGINE COOLANT SRC HIGH EX- When Monitored and Set Condition: P0115-TEMPERATURE OF ENGINE COOLANT SRC HIGH EXCEEDED When Monitored: With the ignition on. Set Condition: The voltage on the ECM engine coolant temperature sensor signal circuit is above 4.9 volts for more than 3 seconds. POSSIBLE CAUSES INTERMITTENT CONDITION ECM ECT SENSOR GROUND CIRCUIT OPEN ECM ECT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE ECM ECT SENSOR ECM ECT SENSOR SIGNAL CIRCUIT OPEN ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → No → 2 Turn the ignition off. All Yes → Repair the ECM ECT Sensor Signal circuit for a short to voltage. No → 3 Turn the ignition off. All Yes → Replace the ECM ECT Sensor in accordance with the Service No → 40 DRIVEABILITY - DIESEL |