SFI SYSTEM Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 (see pageClick here).

WIRING DIAGRAM

Refer to DTC P0230 (see pageClick here).

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK FUEL PUMP OPERATION

   
   

   1. Check fuel pressure (see pageClick here).

      Tip:

      If there is fuel pressure, you will hear the sound of fuel flowing.

   
   
   • OKClick here
   • NGClick here
2. Click here

   INSPECT FUEL PUMP RELAY (F/PMP)

   
   

   1. Inspect the fuel pump relay (F/PMP) (see pageClick here).

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT FUEL PUMP RESISTOR

   
   

   1. Inspect the fuel pump resistor resistance.

   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) 0.941 to 0.999 Ω

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) TO FUEL PUMP)

   
   

   1. Check the harness and connector.

      
      

      1. Remove the circuit opening relay (C/OPN) and fuel pump relay (F/PMP) from the engine room No. 2 relay block.

      2. Disconnect the A16 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 C/OPN relay (3) - F/PMP relay (4) Always Below 1 Ω C/OPN relay (3) - A16-1 Always Below 1 Ω

         Standard resistance (Check for short)
         Tester Connection Condition Specified Condition C/OPN relay (3) or F/PMP relay (4) - Body ground Always 10 kΩ or higher C/OPN relay (3) or A16-1 - Body ground Always 10 kΩ or higher

   2. Check the harness and connector.

      
      

      1. Remove the F/PMP relay from the engine room No. 2 relay block.

      2. Disconnect the A16 fuel pump resistor connector.

      3. Disconnect the S11 fuel pump and fuel sender gauge connector.

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

         Standard resistance (Check for open)
         Tester Connection Condition Specified Condition F/PMP relay (3) - S11-4 Always Below 1 Ω A16-2 - S11-4 Always Below 1 Ω

         Standard resistance (Check for short)
         Tester Connection Condition Specified Condition F/PMP relay (3) or S11-4 - Body ground Always 10 kΩ or higher A16-2 or S11-4 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
5. Click here

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

   
   

   1. Connect the intelligent tester to the DLC3.

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

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

   4. Check whether operating sounds can be heard while operating the relay using the tester.

      OK
      Operating sounds can be heard from relay.

   
   
   • OKClick here
   • NGClick here
6. Click here

   INSPECT EFI MAIN FUSE

   
   
   1. 

      Remove the EFI MAIN fuse from the engine room No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition EFI MAIN fuse Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
7. Click here

   INSPECT EFI RELAY (EFI MAIN)

   
   

   1. Inspect the EFI relay (EFI MAIN) (see pageClick here).

   
   
   • OKClick here
   • NGClick here
8. Click here

   CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - EFI RELAY (EFI MAIN))

   
   
   1. 

      Remove the EFI relay (EFI MAIN) and the circuit opening relay (C/OPN) from the engine room No. 2 relay block.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition EFI MAIN relay (3) - C/OPN relay (5) Always Below 1 Ω

      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition EFI MAIN relay (3) or C/OPN relay (5) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
9. Click here

   INSPECT FUEL PUMP RELAY (F/PMP)

   
   

   1. Inspect the fuel pump relay (F/PMP) (see pageClick here).

   
   
   • OKClick here
   • NGClick here
10. Click here

    INSPECT FUEL PUMP RESISTOR

    
    

    1. Inspect the fuel pump resistor resistance.

    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) 0.941 to 0.999 Ω

    
    
    • OKClick here
    • NGClick here
11. Click here

    CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) TO FUEL PUMP)

    
    

    1. Check the harness and connector.

       
       

       1. Remove the circuit opening relay (C/OPN) and the fuel pump relay (F/PMP) from the engine room No. 2 relay block.

       2. Disconnect the A16 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 C/OPN relay (3) - F/PMP relay (4) Always Below 1 Ω C/OPN relay (3) - A16-1 Always Below 1 Ω

          Standard resistance (Check for short)
          Tester Connection Condition Specified Condition C/OPN relay (3) or F/PMP relay (4) - Body ground Always 10 kΩ or higher C/OPN relay (3) or A16-1 - Body ground Always 10 kΩ or higher

    2. Check the harness and connector.

       
       

       1. Remove the fuel pump relay (F/PMP) from the engine room No. 2 relay block.

       2. Disconnect the A16 fuel pump resistor connector.

       3. Disconnect the S11 fuel pump and fuel sender gauge connector.

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

          Standard resistance (Check for open)
          Tester Connection Condition Specified Condition F/PMP relay (3) - S11-4 Always Below 1 Ω A16-2 - S11-4 Always Below 1 Ω

          Standard resistance (Check for short)
          Tester Connection Condition Specified Condition F/PMP relay (3) or S11-4 - Body ground Always 10 kΩ or higher A16-2 or S11-4 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
12. Click here

    INSPECT FUEL PUMP ASSEMBLY

    
    

    1. Inspect the fuel pump resistance.

       
       

       1. 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) 0.2 to 3.0 Ω

    2. Inspect the fuel pump operation.

       
       

       1. Apply battery voltage to both terminals. Check that the pump operates.

          Note:
          

          • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.

          • Keep the fuel pump as far away from the battery as possible.

          • Always turn the voltage on and off on the battery side, not the fuel pump side.

    
    
    • OKClick here
    • NGClick here
13. Click here

    CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

    
    

    1. Disconnect the S11 fuel pump and fuel sender gauge connector.

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

       Standard resistance
       Tester Connection Condition Specified Condition S11-5 - Body ground Always Below 1 Ω

    
    
    • OKClick here
    • NGClick here
14. Click here

    INSPECT CIRCUIT OPENING RELAY (C/OPN)

    
    

    1. Inspect the circuit opening relay (C/OPN) (see pageClick here).

    
    
    • OKClick here
    • NGClick here
15. Click here

    CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - EFI-B FUSE)

    
    
    1. 

       Remove the circuit opening relay (C/OPN) and EFI-B fuse from the engine room No. 2 relay block.

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

       Standard resistance (Check for open)
       Tester Connection Condition Specified Condition C/OPN relay (1) - EFI-B fuse (2) Always Below 1 Ω

       Standard resistance (Check for short)
       Tester Connection Condition Specified Condition C/OPN relay (1) or EFI-B fuse (2) - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
16. Click here

    CHECK CIRCUIT OPENING RELAY (C/OPN) (POWER SOURCE)

    
    
    1. 

       Remove the circuit opening relay (C/OPN) from the engine room No. 2 relay block.

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

       Standard voltage
       Tester Connection Condition Specified Condition C/OPN relay (1) - Body ground Power switch on (IG) 11 to 14 V

    
    
    • OKClick here
    • NGClick here
17. Click here

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

    
    
    1. 

       Remove the circuit opening relay (C/OPN) from the engine room No. 2 relay block.

    2. Disconnect the A14 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 C/OPN relay (2) - A14-3 (FC) Always Below 1 Ω

       Standard resistance (Check for short)
       Tester Connection Condition Specified Condition C/OPN relay (2) or A14-3 (FC) - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
18. Click here

    REPLACE FUEL PUMP RELAY (F/PMP)

19. Click here

    REPLACE FUEL PUMP RESISTORClick here

20. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

21. Click here

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

22. Click here

    REPLACE EFI RELAY (EFI MAIN)

23. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

24. Click here

    REPLACE FUEL PUMP RELAY (F/PMP)

25. Click here

    REPLACE FUEL PUMP RESISTORClick here

26. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

27. Click here

    REPLACE FUEL PUMPClick here

28. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

29. Click here

    REPLACE CIRCUIT OPENING RELAY (C/OPN)

30. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

31. Click here

    GO TO ECM POWER SOURCE CIRCUITClick here

32. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

33. Click here

    REPLACE ECMClick here

34. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - BATTERY)

35. Click here

    REPLACE ECMClick here