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Home >> Subaru >> 2005 >> Baja Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Engine (Diagnostics) (H4SO) >> Diagnostics for Engine Starting Failure >> Ignition Control System >> Wiring Diagram:

Wiring Diagram:

Fig 1: Wiring Diagram - Ignition Control System
G03748876Courtesy of SUBARU OF AMERICA, INC.
IGNITION CONTROL SYSTEM DIAGNOSTIC STEPS

Step Check Yes No
1. CHECK SPARK PLUG CONDITION. 
  1. Remove the spark plug. Ref. to SPARK PLUG .
  2. Check the spark plug condition. Ref. to INSPECTION .
 Is the spark plug's status OK? Go to step 2.  Replace the spark plug.
2. CHECK IGNITION SYSTEM FOR SPARKS. 
  1. Remove plug cord cap from each spark plug.
  2. Install new spark plug on plug cord cap.
    CAUTION: Do not remove spark plug from engine.
  3. Contact spark plug's thread portion on engine.
  4. While opening throttle valve fully, crank engine to check that spark occurs at each cylinder.
 Does spark occur at each cylinder? Check 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 & IGNITOR ASSEMBLY. 
  1. Turn ignition switch to OFF.
  2. Disconnect connector from ignition coil & ignitor assembly.
  3. Turn ignition switch to ON.
  4. Measure power supply voltage between ignition coil & ignitor assembly connector and engine ground.

Connector & terminal 
(E12) No. 2 (+) - Engine ground (-): 		 Is the measured value more than 10 V? Go to step 4.  Repair harness and connector.
NOTE: In this case, repair the following:
  • Open circuit in harness between ignition coil & ignitor assembly, and ignition switch connector
  • Poor contact in coupling connectors
4. CHECK HARNESS OF IGNITION COIL & IGNITOR ASSEMBLY GROUND CIRCUIT. 
  1. Turn ignition switch to OFF.
  2. Measure resistance between ignition coil & ignitor assembly connector and engine ground.

Connector & terminal 
(E12) No. 3 - Engine ground: 		 Is the measured value less than 5 Ω? Go to step 5.  Repair harness and connector.
NOTE: In this case, repair the following:
  • Open circuit in harness between ignition coil & ignitor assembly connector and engine grounding terminal
5. CHECK IGNITION COIL & IGNITOR ASSEMBLY. 
  1. Remove spark plug cords.
  2. Measure resistance between spark plug cord contact portions to check secondary coil.

Terminals 
No. 1 - No. 2: 
No. 3 - No. 4: 		 Is the measured value within 10 to 15 kΩ? Go to step 6.  Replace ignition coil & ignitor assembly. Ref. to IGNITION COIL AND IGNITOR ASSEMBLY .
6. CHECK INPUT SIGNAL FOR IGNITION COIL & IGNITOR ASSEMBLY. 
  1. Connect connector to ignition coil & ignitor assembly.
  2. Check if voltage varies synchronously with engine speed when cranking, while monitoring voltage between ignition coil & ignitor assembly connector and engine ground.

Connector & terminal 
(E12) No. 1 (+) - Engine ground (-): 
(E12) No. 4 (+) - Engine ground (-): 		 Is the measured value more than 10 V? Go to step 7.  Replace ignition coil & ignitor assembly. Ref. to IGNITION COIL AND IGNITOR ASSEMBLY .
7. CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR. 
  1. Turn ignition switch to OFF.
  2. Disconnect connector from ECM.
  3. Disconnect connector from ignition coil & ignitor assembly.
  4. Measure resistance of harness between ECM and ignition coil & ignitor assembly connector.

Connector & terminal 
(B134) No. 33 - (E12) No. 1: 
(B134) No. 32 - (E12) No. 4: 		 Is the measured value less than 1 Ω? Go to step 8.  Repair harness and connector.
NOTE: In this case, repair the following:
  • Open circuit in harness between ECM and ignition coil & ignitor assembly connector
  • Poor contact in coupling connector
8. CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR. 
Measure resistance of harness between ECM and engine ground.
Connector & terminal: 
(B134) No. 32 - Engine ground: 
(B134) No. 33 - Engine ground: 		 Is the measured value more than 1 MΩ? Go to step 9.  Repair ground short circuit in harness between ECM and ignition coil & ignitor assembly connector.
9. CHECK POOR CONTACT. 
Check poor contact in ECM connector.		 Is there poor contact in ECM connector? Repair poor contact in ECM connector. Check fuel pump circuit. < Ref. to FUEL PUMP CIRCUIT , Diagnostics for Engine Starting Failure. >
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