Malfunction Indicator Light Does Not Come On: Wiring Diagram

Fig 1: Malfunction Indicator Light Wiring Diagram (Circuit Open/Shorted)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK VEHICLE SPECIFICATION	Is the vehicle except for C6 model?	Go to step 2	Go to step 3
2 CHECK DTC	Is DTC of LAN system displayed? Refer to OPERATION , Read Diagnostic Trouble Code (DTC).	Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) , List of Diagnostic Trouble Code (DTC).	Replace the meter case assembly of combination meter. Refer to COMBINATION METER , Combination Meter.
3 CHECK OUTPUT SIGNAL OF ECM Turn the ignition switch to OFF. Disconnect the connector from 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 7	Go to step 4
4 CHECK HARNESS BETWEEN COMBINATION METER AND IGNITION SWITCH CONNECTOR Turn the ignition switch to OFF. Remove the combination meter. Refer to COMBINATION METER , Combination Meter. 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?	Go to step 5	Check the following item and repair if necessary. NOTE: Blown out of fuse Open circuit or short circuit to ground in harness of power supply circuit
5 CHECK HARNESS BETWEEN ECM AND COMBINATION METER CONNECTOR Measure the resistance of harness between ECM and combination meter connector. Connector & terminal (B135) No. 33 - (i10) No. 6:	Is the resistance less than 1 Ω?	Go to step 6	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
6 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.	Replace the meter case assembly of combination meter. Refer to COMBINATION METER , Combination Meter.
7 CHECK ECM CONNECTOR Check the connection of ECM connector.	Is the ECM connector correctly connected?	Go to step 8	Connect the ECM connector correctly
8 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.	Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) , Engine Control Module (ECM).