M/T

DTC P0117 - ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT HIGH 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

10I1: 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 less than -40 °C (-40 °F)?

YES: Go to step 10I2.

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).

10I2: CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

1. Turn ignition switch to OFF.
2. Disconnect connector from engine coolant temperature sensor.

Connector & Terminal - [(E8) No.1 (+) - Engine Ground (-)]:

3. Measure voltage between engine coolant temperature sensor connector and engine ground.

CHECK: Is the voltage more than 10 V?

YES: Repair battery short circuit in harness between ECM and engine coolant temperature sensor connector.

NO: Go to step 1013.

10I3: CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

1. Turn ignition switch to ON.

Connector & Terminal - [(E8) No.1 (+) - Engine Ground (-)]:

2. Measure voltage between engine coolant temperature sensor connector and engine ground.

CHECK: Is the voltage more than 10 V?

YES: Repair battery short circuit in harness between ECM and engine coolant temperature sensor connector.

NO: Go to step 1014.

1014: CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

Connector & Terminal - [(E8) No.1 - Engine Ground (-)]:

Measure voltage between engine coolant temperature sensor connector and engine ground.

CHECK: Is the voltage more than 4 V?

YES: Go to step 1015.

NO: Repair harness and connector.

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

1015: CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

1. Turn ignition switch to OFF.

Connector & Terminal - [(E8) No.2 - Engine Ground]:

2. Measure resistance of harness between engine coolant temperature sensor connector and engine ground.

CHECK: Is the resistance less than 5 Ohms?

YES: Replace engine coolant temperature sensor.

NO: Repair harness and connector.

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