Ignition Control System

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Ignition Control System Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE - IGNITION CONTROL SYSTEM

Step	Check	Yes	No
1 CHECK SPARK PLUG CONDITION. Remove the spark plug. < Ref. to REMOVAL , Spark Plug. > Check the spark plug condition. < Ref. to INSPECTION , Spark Plug. >	Is the spark plug's status OK?	Go to step 2.	Replace the spark plug.
2 CHECK IGNITION SYSTEM FOR SPARKS. Connect the spark plug to ignition coil. Release the fuel pressure. < Ref. to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel. > Contact the spark plug's thread portion on engine. While opening the throttle valve fully, crank engine to check that spark occurs at each cylinder.	Does spark occur at each cylinder?	Check the fuel pump system. < Ref. to FUEL PUMP CIRCUIT , Diagnostics for Engine Starting Failure. >	Go to step 3.
3 CHECK POWER SUPPLY CIRCUIT FOR IGNITION COIL AND IGNITOR ASSEMBLY. Turn the ignition switch to OFF. Disconnect the connector from ignition coil and ignitor assembly. Turn the ignition switch to ON. Measure the power supply voltage between ignition coil and ignitor assembly connector and engine ground. Connector & terminal (E31) No. 3 (+) - Engine ground (-): (E32) No. 3 (+) - Engine ground (-): (E33) No. 3 (+) - Engine ground (-): (E34) No. 3 (+) - Engine ground (-):	Is the voltage more than 10 V?	Go to step 4.	Repair the harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ignition coil and ignitor assembly, and ignition switch connector Poor contact in coupling connectors
4 CHECK HARNESS OF IGNITION COIL AND IGNITOR ASSEMBLY GROUND CIRCUIT. Turn the ignition switch to OFF. Measure the resistance between ignition coil and ignitor assembly connector and engine ground. Connector & terminal (E31) No. 2 - Engine ground: (E32) No. 2 - Engine ground: (E33) No. 2 - Engine ground: (E34) No. 2 - Engine ground:	Is the resistance less than 5 Ω?	Go to step 5.	Repair the harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ignition coil and ignitor assembly connector and engine grounding terminal
5 CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connector from ignition coil and ignitor assembly. Measure the resistance of harness between ECM and ignition coil and ignitor assembly connector. Connector & terminal (B137) No. 21 - (E34) No. 1: (B137) No. 22 - (E33) No. 1: (B137) No. 23 - (E32) No. 1: (B137) No. 24 - (E31) No. 1:	Is the resistance less than 1 Ω?	Go to step 6.	Repair the harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and ignition coil and ignitor assembly connector Poor contact in coupling connector
6 CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR. Measure the resistance of harness between ECM and engine ground. Connector & terminal: (B137) No. 21 - Engine ground: (B137) No. 22 - Engine ground: (B137) No. 23 - Engine ground: (B137) No. 24 - Engine ground:	Is the resistance more than 1 MΩ?	Go to step 7.	Repair the ground short circuit in harness between ECM and ignition coil and ignitor assembly connector.
7 CHECK POOR CONTACT. Check poor contact in ECM connector.	Is there poor contact in ECM connector?	Repair the poor contact in ECM connector.	Replace the ignition coil and ignitor assembly.