2005 Subaru Outback XT, AutomaticFACTORY OEM SERVICE PROCEDURE

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: Wiring Diagram - Ignition Control System
G03829969Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE (IGNITION CONTROL SYSTEM)

Step Check Yes No
1 
CHECK SPARK PLUG CONDITION. 
  1. Remove the spark plug. < Ref. to REMOVAL , Spark Plug. >
  2. 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 
INSPECTION FOR SPARK OF IGNITION SYSTEM. 
  1. Connect the spark plug to ignition coil.
  2. Release the fuel pressure. < Ref. to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel. >
  3. Contact the spark plug's thread portion on engine.
  4. While the throttle valve is opening fully, crank the 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 AND IGNITOR ASSEMBLY. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ignition coil and ignitor assembly.
  3. Turn the ignition switch to ON.
  4. 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 connector
4 
CHECK HARNESS OF IGNITION COIL AND IGNITOR ASSEMBLY GROUND CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. 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 ? 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. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connector from ignition coil and ignitor assembly.
  4. Measure the resistance of harness between ECM and ignition coil and ignitor assembly connector.

    Connector & terminal 

    (B135) No. 15 - (E34) No. 1: 

    (B135) No. 16 - (E33) No. 1: 

    (B135) No. 17 - (E32) No. 1: 

    B135 No. 18 - (E31) No. 1: 

 Is the resistance less than 1 ? 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 

(B135) No. 15 - Engine ground: 

(B135) No. 16 - Engine ground: 

(B135) No. 17 - Engine ground: 

(B135) No. 18 - Engine ground: 

 Is the resistance more than 1 M? 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 the poor contact in ECM connector? Repair the poor contact in ECM connector. Replace the ignition coil and ignitor assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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