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. CHECK FUEL PUMP OPERATION


    1. Check fuel pressure Click here.

      Tech Tips

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


    NG

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

    OK

  2. INSPECT FUEL PUMP RELAY (F/PMP)


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


    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  3. INSPECT FUEL PUMP RESISTOR

    A01GYMHE01

    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

    NG

    REPLACE FUEL PUMP RESISTOR Click here

    OK

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

    A01H0VHE01

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. 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.

    NG

    INSPECT CIRCUIT OPENING RELAY (C/OPN) Click here

    OK

  6. INSPECT EFI MAIN FUSE


    1. A01GY0FE02

      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

    NG

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

    OK

  7. INSPECT EFI RELAY (EFI MAIN)


    1. Inspect the EFI relay (EFI MAIN) Click here.


    NG

    REPLACE EFI RELAY (EFI MAIN)

    OK

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


    1. A01GWSXE02

      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT FUEL PUMP RELAY (F/PMP)


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


    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  10. INSPECT FUEL PUMP RESISTOR

    A01GYMHE01

    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

    NG

    REPLACE FUEL PUMP RESISTOR Click here

    OK

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

    A01H0VHE01

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT FUEL PUMP ASSEMBLY

    A01GY1ME02

    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.


    NG

    REPLACE FUEL PUMP Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

    A01GZ2BE03

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  14. INSPECT CIRCUIT OPENING RELAY (C/OPN)


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


    NG

    REPLACE CIRCUIT OPENING RELAY (C/OPN)

    OK

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


    1. A01GZRFE02

      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01GZUUE02

      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

    NG

    GO TO ECM POWER SOURCE CIRCUIT Click here

    OK

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


    1. A01GWXKE02

      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here