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Home >> Subaru >> 2024 >> Forester Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (4 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P26F0: Starter Relay "A" Stuck On >> Notes

DTC P26F0: Starter Relay "A" Stuck On: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Auto Start Stop does not operate.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

G13589230Courtesy of SUBARU OF AMERICA, INC.
G00674408Courtesy of SUBARU OF AMERICA, INC.
G13891324Courtesy of SUBARU OF AMERICA, INC.
G00674409Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK STARTER RELAY  .
    1. Turn the ignition switch to OFF.
    2. Remove the starter relay.
    3. Measure the resistance between starter relay terminals.

      Connector & terminal 

      No. 1 - No. 3:

    Is the resistance less than 1 Ω?

    Yes:  Replace the starter relay. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>STARTER RELAY .

    No:  Go to  2.

  2. CHECK HARNESS BETWEEN ECM CONNECTOR AND STARTER RELAY (SHORT TO GROUND)  .
    1. Disconnect the ECM connector.
    2. Measure the resistance between the ECM connector and engine ground.

      Connector & terminal 

      (B62) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Check for poor contact of ECM connector. Replace the ECM if no fault is found. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) .

    No:  Repair the short circuit to ground in harness between ECM connector and starter relay.