Malfunction Indicator Light Remains Blinking

Diagnosis:

The delivery (test) mode fuse circuit is short-circuited to ground.

Trouble symptom:

Malfunction indicator light blinks when delivery (test) mode fuse is not connected.

Wiring diagram:

Engine Electrical System Ref. to WIRING DIAGRAM , Engine Electrical System.

Fig 1: Delivery Mode Fuse Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK DELIVERY (TEST) MODE FUSE. Check the delivery (test) mode fuse is removed. Turn the ignition switch to ON.	Does the malfunction indicator light blink?	Go to step 2	System is normal. NOTE: Malfunction indicator light blinks at a cycle of 3 Hz when delivery (test) mode fuse is attached.
2 CHECK HARNESS BETWEEN ECM AND DELIVERY (TEST) MODE FUSE. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B134) No. 53 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)	Repair the short circuit to ground in the harness between the ECM connector and delivery (test) mode fuse.