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Fuel Injector Circuit: Wiring Diagram

Fig 1: Fuel Injector - Wiring Diagram
G05017532Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 CHECK OPERATION OF EACH FUEL INJECTOR. 
While cranking the engine, check each fuel injector emits operating sound. Use a sound scope or attach a screwdriver to the injector for this check.		 Does the fuel pump emit operating sound? Check the fuel pressure. <Ref. to INSPECTION , Fuel Pressure .> Go to step 2  .
2 CHECK POWER SUPPLY TO EACH FUEL INJECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from fuel injector.
  3. Turn the ignition switch to ON.
  4. Measure the power supply voltage between fuel injector terminal and engine ground.

    Connector & terminal 

    #1 (E5) No. 2 (+) - Engine ground (-): 

    #2 (E16) No. 2 (+) - Engine ground (-): 

    #3 (E6) No. 2 (+) - Engine ground (-): 

    #4 (E17) No. 2 (+) - Engine ground (-): 

 Is the voltage 10 V or more? Go to step 3.  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit of harness between main relay and fuel injector connector
  • Poor contact of main relay connector
  • Poor contact of coupling connector
  • Poor contact of fuel injector connector
3 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
  1. Disconnect the connectors from the ECM.
  2. Measure the resistance of harness between ECM and fuel injector connector.

    Connector & terminal 

    #1 (B137) No. 8 - (E5) No. 1: 

    #2 (B137) No. 9 - (E16) No. 1: 

    #3 (B137) No. 10 - (E6) No. 1: 

    #4 (B137) No. 11 - (E17) No, 1: 

 Is the resistance less than 1 Ω? Go to step 4.  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit of harness between ECM and fuel injector connector
  • Poor contact of coupling connector
4 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
Measure the resistance of harness between ECM and fuel injector connector.
Connector & terminal 
#1 (B137) No. 8 - Chassis ground: 
#2 (B137) No. 9 - Chassis ground: 
#3 (B137) No. 10 - Chassis ground: 
#4 (B137) No. 11 - Chassis ground: 		 Is the resistance 1 MΩ or more? Go to step 5.  Repair the ground short circuit of harness between ECM and fuel injector connector.
5 CHECK EACH FUEL INJECTOR. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between each fuel injector terminals.

    Terminals 

    No. 1 - No. 2: 

 Is the resistance between 5 - 20 Ω? Go to step 6.  Replace the faulty fuel injector.
6 CHECK POOR CONTACT. 
Check for poor contact of the ECM connector.		 Is there poor contact in ECM connector? Repair poor contact of the ECM connector. Inspection using "General Diagnostic Table" <Ref. to INSPECTION , General Diagnostic Table .>
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