Malfunction Indicator Light Does Not Come On: Wiring Diagram

WARNING: This page is about a different variant/trim than selected.

Fig 1: Malfunction Indicator Light Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 33 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 5 .	Go to step 2 .
2 CHECK HARNESS BETWEEN COMBINATION METER AND ECM CONNECTOR. Turn the ignition switch to OFF. Remove the combination meter. Refer to COMBINATION METER Combination Meter. Disconnect the connector from ECM and combination meter. Measure the resistance of harness between ECM connector and combination meter connector. Connector & terminal (B135) No. 33 - (i10) No. 6:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and combination meter connector Poor contact of coupling connector
3 CHECK FOR POOR CONTACT. Check for poor contact of combination meter connector.	Is there poor contact of combination meter connector?	Repair the poor contact of combination meter connector.	Go to step 4 .
4 CHECK HARNESS BETWEEN COMBINATION METER AND IGNITION SWITCH CONNECTOR. Turn the ignition switch to ON. Measure the voltage between combination meter connector and chassis ground. Connector & terminal (i10) No. 19 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Replace the meter case assembly of combination meter. Refer to COMBINATION METER Combination Meter.	Check the following item and repair if necessary. NOTE: Blown-out of fuse (F/B No. 5) Open harness of the power supply circuit or defective grounding
5 CHECK FOR POOR CONTACT. Check for poor connection by shaking or pulling ECM connector and harness.	Does the malfunction indicator light illuminate?	Repair the poor contact of ECM connector.	Go to step 6 .
6 CHECK ECM CONNECTOR. Check the connection of ECM connector.	Is the ECM connector correctly connected?	Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) Engine Control Module (ECM).	Repair the connection of ECM connector.