Ignition Control System

CAUTION: After repair or replacement of faulty parts, perform Clear Memory Mode < Refer to OPERATION , CLEAR MEMORY MODE > and Inspection Mode < Refer to PROCEDURE , INSPECTION MODE >.

WIRING DIAGRAM:

Fig 1: Ignition Control - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC CHART

Step	Check	Yes	No
1 CHECK SPARK PLUG CONDITION. Remove the spark plug. < Refer to REMOVAL , Spark Plug. > Check the spark plug condition. < Refer to INSPECTION , Spark Plug. >	Is the spark plug 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. Contact the spark plug thread portion on engine. While opening the throttle valve fully, start the engine to check if spark occurs at each cylinder.	Does spark occur at each cylinder?	Check fuel pump system. < Refer 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 & 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 (-): (E45) No. 3 (+) - Engine ground (-): (E46) 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 item: Open circuit of harness between the ignition coil and ignitor assembly, and ignition switch connector Poor contact of coupling connector
4 CHECK HARNESS OF IGNITION COIL AND IGNITOR ASSEMBLY GROUND CIRCUIT. Turn the ignition switch to OFF. Measure the resistance between the 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: (E45) No. 2 - Engine ground: (E46) 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 item: Open circuit of harness between ignition coil and ignitor assembly connector & engine grounding terminal
5 CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Disconnect the connector from ignition coil & ignitor assembly. Measure the resistance of harness between ECM and ignition coil and ignitor assembly connector. Connector & terminal (B137) No. 18 - (E31) No. 1: (B137) No. 19 - (E32) No. 1: (B137) No. 20 - (E33) No. 1: (B137) No. 21 - (E34) No. 1: (B137) No. 22 - (E45) No. 1: (B137) No. 23 - (E46) 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 item: Open circuit of harness between ECM and ignition coil and ignitor assembly connector Poor contact of 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. 18 - Engine ground: (B137) No. 19 - Engine ground: (B137) No. 20 - Engine ground: (B137) No. 21 - Engine ground: (B137) No. 22 - Engine ground: (B137) No. 23 - Engine ground:	Is the resistance more than 1 MΩ?	Go to step 7.	Repair the ground short circuit of harness between ECM and ignition coil & ignitor assembly connector.
7 CHECK POOR CONTACT. Check poor contact of ECM connector.	Is there poor contact in ECM connector?	Repair poor contact in ECM connector.	Check the fuel pump circuit. < Refer to FUEL PUMP CIRCUIT , DIAGNOSTICS FOR ENGINE STARTING FAILURE. >