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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I, ENG CD FB25BA, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 9 (ENGINE CONTROL SYSTEM (DIAGNOSTICS) (H4DOTC))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0198: ENGINE OIL TEMPERATURE SENSOR HIGHWIRING DIAGRAM
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard Trans

DTC P0198: Engine Oil Temperature Sensor High: Wiring Diagram

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Wiring Diagram
WARNING: This page is about a different variant/trim than selected.
  • Engine electrical system turbo engine model (without push button start) < Ref. to TURBO MODEL (WITHOUT PUSH BUTTON START) , WIRING DIAGRAM, Engine Electrical System. >
  • Engine electrical system turbo engine model (with push button start) < Ref. to TURBO MODEL (WITH PUSH BUTTON START) , WIRING DIAGRAM, Engine Electrical System. >
    Fig 1: Engine Oil Temperature Sensor Wiring Diagram
    G09480920Courtesy of SUBARU OF AMERICA, INC.
DTC PROCEDURE

Step Check Yes No
1 CHECK CURRENT DATA. 
  1. Start the engine.
  2. Read the value of «Oil Temperature» 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". < Ref. to SUBARU SELECT MONITOR . >

    • General scan tool

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

 Is the value of «Oil Temperature » -40°C (-40°F) or less? 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 between the ECM and engine oil temperature sensor connectors.		 Is there poor contact of the ECM or engine oil temperature sensor connectors? Repair the poor contact of ECM or engine oil temperature sensor connector. Go to step 3  .
3 CHECK HARNESS BETWEEN ECM AND ENGINE OIL TEMPERATURE SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from the ECM and engine oil temperature sensor.
  3. Measure the resistance of the harness between the ECM and engine oil temperature sensor connector.

    Connector & terminal 

    (E159) No. 27 - (E75) No. 1: 

    (E158) No. 2 - (E75) No. 2: 

 Is the resistance less than 1 Ω? Go to step 4  . Repair the open circuit in the harness between the ECM and engine oil temperature sensor connector.
4 CHECK HARNESS BETWEEN ECM AND ENGINE OIL TEMPERATURE SENSOR CONNECTOR. 
  1. Connect all connectors.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between ECM and engine ground.

    Connector & terminal 

    (E158) No. 2 (+) - Engine ground (-): 

 Is the voltage 5 V or more? Repair the short circuit to power in harness between ECM and engine oil temperature sensor connector. Replace the engine oil temperature sensor. < Ref. to ENGINE OIL TEMPERATURE SENSOR . >
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.