Malfunction Indicator Light Does Not Come On

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

DIAGNOSIS:

The malfunction indicator light circuit is open or shorted.

TROUBLE SYMPTOM:

When the ignition switch is turned to ON (engine OFF), malfunction indicator light does not come on.

WIRING DIAGRAM:

Fig 1: Wiring Diagram - Malfunction Indicator Light Does Not Come On

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE (MALFUNCTION INDICATOR LIGHT DOES NOT COME ON)

Step	Check	Yes	No
1 CHECK OUTPUT SIGNAL FROM ECM. Turn the ignition switch to ON. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 17 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 4.	Go to step 2.
2 CHECK POOR CONTACT. Check for poor connection when shaking or pulling ECM connector and harness.	Does malfunction indicator light illuminate?	Repair the poor contact in ECM connector.	Go to step 3.
3 CHECK ECM CONNECTOR. Check the connection of ECM connector.	Is the ECM connector correctly connected?	Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Repair the connection of ECM connector.
4 CHECK HARNESS BETWEEN COMBINATION METER AND ECM CONNECTOR. Turn the ignition switch to OFF. Remove the combination meter. < Ref. to COMBINATION METER . > Disconnect the connector from ECM and combination meter. Measure the resistance of harness between ECM and combination meter connector. Connector & terminal (B134) No. 17 - (i10) No. 16:	Is the resistance less than 1 ?	Go to step 5.	Repair the harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and combination meter connector Poor contact in coupling connector
5 CHECK POOR CONTACT. Check poor contact in combination meter connector.	Is there poor contact in combination meter connector?	Repair the poor contact in combination meter connector.	Go to step 6.
6 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. 3 (+) - Chassis ground (-): i10 No. 4 (+) - Chassis ground (-):	Is the voltage more than 10 V?	Replace the board of combination meter. < Ref. to COMBINATION METER . >	Check the following and repair if necessary. NOTE: Blown out fuse Open or short circuit in harness between fuse and battery terminal Poor contact in ignition switch connector