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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls - Engine (Diagnostics) (H4DOTC)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0230 Fuel Pump Primary Circuit >> Wiring Diagram:

Wiring Diagram:

WARNING: This page is about a different variant/trim than selected.
Fig 1: Wiring Diagram - DTC P0230 Fuel Pump Primary Circuit
G03830004Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE (DTC P0230)

Step Check Yes No
1 
CHECK POWER SUPPLY CIRCUIT TO FUEL PUMP CONTROL UNIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from fuel pump control unit.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between fuel pump control unit and chassis ground.

    Connector & terminal 

    (R122) No. 10 (+) - Chassis ground (-): 

 Is the voltage more than 10 V? Go to step 2.  Repair the power supply circuit.
NOTE: In this case, repair the following:
  • Open or ground short circuit in harness between fuel pump relay and fuel pump control unit
  • Poor contact in fuel pump control unit connector
  • Poor contact in fuel pump relay connector
2 
CHECK GROUND CIRCUIT OF FUEL PUMP CONTROL UNIT. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance of harness between fuel pump control unit and chassis ground.

    Connector & terminal 

    (R122) No. 5 - Chassis ground: 

 Is the resistance less than 5 ? Go to step 3.  Repair the harness and connector.
NOTE: In this case, repair the following:
  • Open circuit between fuel pump control unit and chassis ground
  • Poor contact in fuel pump control unit connector
3 
CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND FUEL PUMP CONNECTOR. 
  1. Disconnect the connector from fuel pump.
  2. Measure the resistance of harness between fuel pump control unit and fuel pump connector.

    Connector & terminal 

    (R122) No. 7-(R58) No. 5: 

    (R122) No. 6-(R58) No. 6: 

 Is the resistance less than 1 ? Go to step 4.  Repair the open circuit between fuel pump control unit and fuel pump.
4 
CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND FUEL PUMP CONNECTOR. 
Measure the resistance of harness between fuel pump control unit and chassis ground.

Connector & terminal 

(R122) No. 7 - Chassis ground: 

(R122) No. 6 - Chassis ground: 

 Is the resistance more than 1 M? Go to step 5.  Repair the ground short circuit between fuel pump control unit and fuel pump.
5 
CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND ECM CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance in harness between fuel pump control unit and ECM connector.

    Connector & terminal 

    (R122) No. 9 - (B137) No. 28: 

    (R122) No. 8 - (B135) No. 27: 

 Is the resistance less than 1 ? Go to step 6.  Repair the harness and connector.
NOTE: In this case, repair the following:
  • Open circuit between fuel pump control unit and ECM
  • Poor contact in fuel pump control unit and ECM connector
6 
CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND ECM CONNECTOR. 
Measure the resistance of harness between fuel pump control unit and chassis ground.
Connector & terminal 
(R122) No. 9 - Chassis ground: 
(R122) No. 8 - Chassis ground: 		 Is the resistance more than 1 M? Go to step 7.  Repair the ground short circuit between fuel pump control unit and ECM.
7 
CHECK POOR CONTACT. 
Check poor contact in ECM and fuel pump control unit connector.		 Is there poor contact in ECM and fuel pump control unit connector? Repair the poor contact in ECM and fuel pump control unit. Go to step 8. 
8 
CHECK EXPERIENCE OF RUNNING OUT OF FUEL. 		 Did the vehicle experience running out of fuel? Finish the diagnosis.
NOTE: DTC record may be conducted as a result of fuel pump idling while running out of fuel.
 Replace the fuel pump control unit. < Ref. to FUEL PUMP CONTROL UNIT . >
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