DTC P081A: Starter Disable Circuit Low: Notes

Immediately at fault recognition

Trouble symptom: 

Failure of engine to start

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK HARNESS BETWEEN STARTER RELAY (PUSH BUTTON START) CONNECTOR AND STARTER CUT RELAY CONNECTOR. 
   1. Turn the ignition to OFF.
   2. Remove the starter relay (push button start).
   3. Remove the starter cut relay.
   4. Measure the resistance of harness between starter relay (push button start) connector and starter cut relay connector.

      Connector & terminal 

      (B225) No. 28 - (B225) No. 42:

   Is the resistance less than 1 Ω?

   Yes:  Go to  2.

   No:  Repair the open circuit in harness between starter relay (push button start) connector and starter cut relay connector.

2. CHECK HARNESS BETWEEN ECM AND STARTER CUT RELAY CONNECTOR. 
   1. Disconnect the connector from ECM.
   2. Measure the resistance of harness between ECM connector and starter cut relay connector.

      Connector & terminal 

      (B135) No. 34 - (B225) No. 40:

   Is the resistance less than 1 Ω?

   Yes:  Go to  3.

   No:  Repair the open circuit of harness between ECM connector and starter cut relay connector.

3. CHECK STARTER CUT RELAY. 
   1. Connect the battery to starter cut relay terminals No. 40 and No. 42.
   2. Measure the resistance between starter cut relay terminals.

      Terminals 

      No. 41 - No. 44:

   Is the resistance 1 MΩ or more?

   Yes:  Repair the poor contact of ECM connector.

   No:  Replace the starter cut relay. Refer to SECURITY AND LOCKS>STARTER CUT RELAY .