Subaru Crosstrek Service Manual: Dtc p0118 engine coolant temperature sensor 1 circuit high

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

• Hard to start

• Improper idling

• Poor driving performance

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">.

1.CHECK CURRENT DATA.

1) Start the engine.

2) Read the value of «Coolant Temp.» using the Subaru Select Monitor or a general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedures, refer to “Current Data Display For Engine”. Subaru Select Monitor">

• General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

Is the value of «Coolant Temp.» −40°C (−40°F) or less?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0118 ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT HIGH">Go to Step 2.

Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

2.CHECK FOR POOR CONTACT.

Check for poor contact of ECM and engine coolant temperature sensor connector.

Is there poor contact of ECM or engine coolant temperature sensor connector?

Repair the poor contact of ECM or engine coolant temperature sensor connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0118 ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT HIGH">Go to Step 3.

3.CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Disconnect the connectors from the engine coolant temperature sensor.

4) Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

Connector & terminal

(B134) No. 30 — (E8) No. 2:

(B134) No. 29 — (E8) No. 1:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0118 ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT HIGH">Go to Step 4.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM connector and engine coolant temperature sensor connector

• Poor contact of coupling connector

4.CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR.

1) Connect all connectors.

2) Turn the ignition switch to ON.

3) Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B137) No. 30 (+) — Chassis ground (−):

Is the voltage 5 V or more?

Repair the short circuit of harness to power supply between ECM connector and engine coolant temperature sensor connector.

Replace the engine coolant temperature sensor. Engine Coolant Temperature Sensor">

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