Malfunction Indicator Light Remains Blinking

Diagnosis: 

Delivery mode fuse circuit is shorted to ground.

Trouble symptom: 

Malfunction indicator light blinks when delivery mode fuse is not installed.

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DELIVERY MODE FUSE  .
   1. Make sure that the delivery mode fuse is removed.
   2. Turn the ignition switch to ON.

   Does the malfunction indicator light blink?

   Yes: Go to  2.

   NO: System is normal.

   NOTE: Malfunction indicator light blinks at a cycle of 3 Hz when delivery mode fuse is installed.
2. CHECK HARNESS BETWEEN ECM AND DELIVERY MODE FUSE  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Measure the resistance between ECM connector and chassis ground.

      Connector & terminal

      (B136) No. 34 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (STI)>Engine Control Module (ECM) .

   No: Repair the short circuit to ground in harness between ECM connector and delivery mode fuse.