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Home >> Subaru >> 2018 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) (STI) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0616: Starter Relay "A" Circuit Low >> Model With Push Button Start
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Model With Push Button Start

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Failure of engine to start

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (STI)>Inspection Mode>PROCEDURE .

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

G11574201Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK HARNESS BETWEEN ECM AND STARTER RELAY 1 CONNECTOR  .
    1. Turn the ignition to OFF.
    2. Disconnect the connector from ECM.
    3. Remove the starter relay 1.
    4. Measure the resistance of harness between ECM connector and starter relay 1 connector.

      Connector & terminal 

      (B136) No. 27 - (B225) No. 1:

    Is the resistance less than 1 Ω?

    Yes:  Go to  2

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit of harness between ECM connector and starter relay 1 connector
    • Blown out of fuse
  2. CHECK HARNESS BETWEEN ECM AND STARTER RELAY 1 CONNECTOR  .
    1. Disconnect the connector from starter motor.
    2. Measure the resistance between ECM connector and chassis ground.

      Connector & terminal 

      (B136) No. 27 - 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 1 connector.