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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2.5L) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0616: Starter Relay "A" Circuit Low >> Model Without Push Button Start
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Model Without Push Button Start

DTC detecting condition: 

Immediately at fault recognition

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Refer to ENGINE (DIAGNOSTICS) (STI)>CLEAR MEMORY MODE>OPERATION ., and inspection mode Refer to ENGINE (DIAGNOSTICS) (STI)>INSPECTION MODE>PROCEDURE .

Wiring diagram: 

Engine Electrical System Refer to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

G11574200Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC. 

    Read the engine DTC using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC other than P0616 displayed? (Current malfunction)

    Yes:  Check DTC using "List of Diagnostic Trouble Code (DTC)". Refer to ENGINE (DIAGNOSTICS) (STI)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

    No:  Go to  2.

  2. CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Remove the starter relay.
    3. Disconnect the connector from ECM.
    4. Disconnect the connector from starter motor.
    5. Measure the resistance of harness between ECM connector and starter relay connector.

    Connector & terminal 

    (B136) No. 16 - (B225) No. 1:

    Is the resistance less than 1 Ω?

    Yes:  Go to  3.

    No 

    NOTE: Check the following item and repair or replace if necessary.
    • Open circuit of harness between ECM connector and starter relay connector
    • Blown out of fuse
  3. CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. 

    Measure the resistance between ECM connector and chassis ground.

    Connector & terminal 

    (B136) No. 16 - Chassis ground:

    Is the resistance 1 MΩ or more?

    Yes:  Repair the poor contact of ECM connector.

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