SFI SYSTEM Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 (Click here).

WIRING DIAGRAM

Refer to DTC P0230 (Click here).

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK FUEL PUMP OPERATION

   
   

   1. Check the fuel pump operation (Click here).

   
   
   • OKClick here
   • NGClick here
2. Click here

   INSPECT F/PMP RELAY

   
   
   1. 

      Remove the F/PMP relay from the engine room relay block.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition 3 - 4 No battery voltage applied to terminals 1 and 2 Below 1 Ω 3 - 4 Battery voltage applied to terminals 1 and 2 10 kΩ or higher 3 - 5 No battery voltage applied to terminals 1 and 2 10 kΩ or higher 3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

   3. Reinstall the F/PMP relay.

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT FUEL PUMP RESISTOR

   
   
   1. 

      Disconnect the fuel pump resistor connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 0.30 to 0.34 Ω

   3. Reconnect the fuel pump resistor connector.

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTOR)

   
   
   1. 

      Remove the F/PMP relay from the engine room relay block.

   2. Disconnect the fuel pump resistor connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition 5 (F/PMP relay) - A12-1 (Fuel pump resistor) Always Below 1 Ω 4 (F/PMP relay) - A12-2 (Fuel pump resistor) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition 5 (Fuel pump relay) or A12-1 (Fuel pump resistor) - Body ground Always 10 kΩ or higher 4 (Fuel pump relay) or A12-2 (Fuel pump resistor) - Body ground Always 10 kΩ or higher

   4. Reinstall the F/PMP relay.

   5. Reconnect the fuel pump resistor connector.

   
   
   • OKClick here
   • NGClick here
5. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG) and turn the tester on.

   3. Enter the following menus: Powertrain / Engine / Active Test /Activate the Fuel Pump Speed Control.

   4. Check the operation of the relay while operating it using the tester.

      OK
      Operating noise can be heard from the relay.

   
   
   • OKClick here
   • NGClick here
6. Click here

   INSPECT FUEL PUMP

   
   

   1. Inspect the fuel pump (Click here).

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY)

   
   
   1. 

      Disconnect the fuel pump connector.

   2. Remove the F/PMP relay from the engine room relay block.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition N19-4 (Fuel pump) - 4 (F/PMP relay) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition N19-4 (Fuel pump) or 4 (F/PMP) - Body ground Always 10 kΩ or higher

   4. Reinstall the F/PMP relay.

   5. Reconnect the fuel pump connector.

   
   
   • OKClick here
   • NGClick here
8. Click here

   INSPECT RELAY BLOCK ASSEMBLY (C/OPN RELAY - F/PMP RELAY)

   
   
   1. 

      Remove the C/OPN relay from the engine room relay block.

   2. Remove the F/PMP relay from the engine room relay block.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition 3 (C/OPN relay) - 2 (F/PMP relay) Always Below 1 Ω 3 (C/OPN relay) - 3 (F/PMP relay) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition 3 (C/OPN relay) or 2 (F/PMP relay) - Body ground Always 10 kΩ or higher 3 (C/OPN relay) or 3 (F/PMP relay) - Body ground Always 10 kΩ or higher

   4. Reinstall the C/OPN relay.

   5. Reinstall the F/PMP relay.

   
   
   • OKClick here
   • NGClick here
9. Click here

   CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

   
   
   1. 

      Disconnect the fuel pump connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition N19-5 (Fuel pump) - Body ground Always Below 1 Ω

   3. Reconnect the fuel pump connector.

   
   
   • OKClick here
   • NGClick here
10. Click here

    CHECK FUEL LINE

    
    

    1. Check the fuel lines for leaks or blockage.

       OK
       No leaks or blockage

    
    
    • OKClick here
    • NGClick here
11. Click here

    INSPECT RELAY (C/OPN RELAY)

    
    
    1. 

       Remove the C/OPN relay from the engine room relay block.

    2. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition 3 - 5 No battery voltage applied to terminals 1 and 2 10 kΩ or higher 3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the C/OPN relay.

    
    
    • OKClick here
    • NGClick here
12. Click here

    CHECK HARNESS AND CONNECTOR (C/OPN VOLTAGE)

    
    
    1. 

       Remove the C/OPN relay from the engine room relay block.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Switch Condition Specified Condition 5 (C/OPN relay) - Body ground Engine switch on (IG) 11 to 14 V 1 (C/OPN relay) - Body ground Engine switch on (IG) 11 to 14 V

    4. Reinstall the C/OPN relay.

    
    
    • OKClick here
    • NGClick here
13. Click here

    CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

    
    
    1. 

       Remove the C/OPN relay from the engine room relay block.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition 2 (C/OPN relay) - A8-7 (FC) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition 2 (C/OPN relay) or A8-7 (FC) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the C/OPN relay.

    
    
    • OKClick here
    • NGClick here
14. Click here

    REPLACE F/PMP RELAY

15. Click here

    REPLACE FUEL PUMP RESISTORClick here

16. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTOR)

17. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

18. Click here

    REPLACE FUEL PUMPClick here

19. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - F/PMP RELAY)

20. Click here

    REPLACE ENGINE ROOM RELAY BLOCK

21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND)

22. Click here

    REPAIR OR REPLACE FUEL LINE

23. Click here

    REPAIR OR REPLACE FUEL SYSTEM (PRESSURE REGULATOR AND FUEL FILTER)

24. Click here

    REPLACE RELAY (C/OPN RELAY)

25. Click here

    CHECK ECM POWER SOURCE CIRCUITClick here

26. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - ECM)

27. Click here

    REPLACE ECMClick here