DTC P0116: Engine Coolant Temperature Sensor 1 Circuit Range/Performance: Notes
DTC detecting condition:
Detected when two consecutive driving cycles with fault occur.
Trouble symptom:
- Hard to start
- Improper idling
- Poor driving performance
- After servicing or replacing faulty parts, perform Clear Memory Mode Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>CLEAR MEMORY MODE>OPERATION , and inspection mode Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>INSPECTION MODE>PROCEDURE ..
- Use the check board when measuring the ECM terminal voltage and resistance.
Wiring diagram:
Engine Electrical System Refer to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .
- CHECK DTC.
Read the engine DTC using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>READ DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC other than P0116 displayed? (Current malfunction)
Yes: Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .
No: Go to 2.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR.
- Disconnect the connectors from the engine coolant temperature sensor.
- Measure the resistance between engine coolant temperature sensor terminals when the engine coolant is cold and after warmed up.
Terminals
No. 1 - No. 2:
Is the resistance of engine coolant temperature sensor different between when engine coolant is cold and after warmed up?
Yes: Repair the poor contact of ECM connector.
No: Replace the engine coolant temperature sensor. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>ENGINE COOLANT TEMPERATURE SENSOR .