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Symptom List: P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0115-ENGINE COOLANT TEMP POSSIBLE CAUSES ECT SENSOR ECT SENSOR - COLD ECT SENSOR - HOT HGH RESISTANCE IN ECT SENSOR CIRCUITS ENGINE COLD TOO LONG TEST ACTION APPLICABILITY 1 Note: The best way to diagnose this DTC is to allow the vehicle to remain t, set the engine RPM to 1500 and allow the engine to warm up for 10-15 minutes. t, monitor the Engine Coolant Temperature value during the warm up cycle. Make sure the transition of temperature change is smooth. All Yes → Go To 2 No → Refer to the Service Information for cooling system performance diagnosis. The most probable cause is a Thermostat problem. 2 NOTE: The engine temperature must be below 50°C (120°F) for this test. t in Sensors, read and note the engine coolant temperature. Using a temperature probe, measure the engine block temperature near the ECT All Yes → Go To 3 No → Go To 4 40 DRIVEABILITY - DIESEL |