DTC P0198 Engine Oil Temperature Sensor High

WARNING: This page is about a different car, the 2006 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P0198 ENGINE OIL TEMPERATURE SENSOR HIGH , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Hard to start
Erroneous idling
Poor driving performance

CAUTION: After repair or replacement of faulty parts, perform Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Engine Oil Temperature Sensor - Wiring Diagram

DTC P0198 ENGINE OIL TEMPERATURE SENSOR HIGH - DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN OIL TEMPERATURE SENSOR AND ECM CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from the oil temperature sensor. Measure the voltage between oil temperature sensor connector and engine ground. Connector & terminal (E75) No. 2 (+) - Engine ground (-):	Is the voltage more than 10 V?	Repair the battery short circuit of harness between ECM and oil temperature sensor connector.	Go to step 2.
2 CHECK HARNESS BETWEEN OIL TEMPERATURE SENSOR AND ECM CONNECTOR. Turn the ignition switch to ON. Measure the voltage between oil temperature sensor connector and engine ground. Connector & terminal (E75) No. 2 (+) - Engine ground (-):	Is the voltage more than 10 V?	Repair the battery short circuit of harness between ECM and oil temperature sensor connector.	Go to step 3.
3 CHECK HARNESS BETWEEN OIL TEMPERATURE SENSOR AND ECM CONNECTOR. Measure the voltage between oil temperature sensor connector and engine ground. Connector & terminal (E75) No. 2 (+) - Engine ground (-):	Is the voltage more than 4 V?	Go to step 4.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and oil temperature sensor connector Poor contact of oil temperature sensor connector Poor contact in ECM connector Poor contact in coupling connector
4 CHECK HARNESS BETWEEN OIL TEMPERATURE SENSOR AND ECM CONNECTOR. Turn the ignition switch to OFF. Measure the resistance of harness between oil temperature sensor connector and engine ground. Connector & terminal (E75) No. 1 - Engine ground:	Is the resistance less than 5 Ω?	Replace the engine oil temperature sensor. < Ref. to OIL TEMPERATURE SENSOR . >	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and oil temperature sensor connector Poor contact in oil temperature sensor connector Poor contact in ECM connector Poor contact in coupling connector Poor contact in joint connector