M/T

DTC P0116 - ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
- Immediately at fault recognition

TROUBLE SYMPTOM:
- Hard to start
- Erroneous idling
- Poor driving performance

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.

Wiring Diagram:

WIRING DIAGRAM

10H1: CHECK CURRENT DATA.

1. Start engine.
2. Read data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:
- Subaru Select Monitor
For detailed operation procedure, refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE". Refer to Normal Scan Data Values.
- OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

CHECK: Is the value greater than 120 °C (248 °F)?

YES: Go to step 10H2.

NO: Repair poor contact.

NOTE: In this case, repair the following:
- Poor contact in engine coolant temperature sensor
- Poor contact in ECM
- Poor contact in coupling connector (B21).
- Poor contact in joint connector (B83).

10H2: CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

1. Turn ignition switch to OFF.
2. Disconnect connector from engine coolant temperature sensor.
3. Turn ignition switch to ON.
4. Read data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:
- Subaru Select Monitor
For detailed operation procedure, refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE". Refer to Normal Scan Data Values.
- OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

CHECK: Is the value less than -40 °C (-40 °F)?

YES: Replace engine coolant temperature sensor.

NO: Repair ground short circuit in harness between engine coolant temperature sensor and ECM connector.