DTC P0117 Engine Coolant Temperature Circuit Low: Wiring Diagram

WARNING: This page is about a different variant/trim than selected.

Fig 1: Engine Coolant Temperature - Wiring Diagram

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Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CURRENT DATA . Start the engine. Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". Ref. to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, refer to the general scan tool operation manual.	Is the temperature 150°C (302°F) or more?	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 HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR . Turn the ignition switch to OFF. Disconnect the connectors from ECM and engine coolant temperature sensor. Measure the resistance between ECM and chassis ground. Connector & terminal (B137) No. 22 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR .	Repair short circuit in harness to ground between ECM and engine coolant temperature sensor connector.