SFI SYSTEM Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 Click here.

WIRING DIAGRAM

Refer to DTC P0230 Click here.

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.


    OK

    INSPECT FUEL PUMP RELAY (F/PMP) Click here

    NG

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


    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 / Control the Fuel Pump / Speed.

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

      OK
      Operating sounds can be heard from relay.

    OK

    INSPECT ECM POWER SOURCE CIRCUIT Click here

    NG

  3. INSPECT CIRCUIT OPENING RELAY (C/OPN)

    A001BUF

    1. Remove the C/OPN relay 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
      3 - 5 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE CIRCUIT OPENING RELAY (C/OPN)

    OK

  4. INSPECT ECM (FC VOLTAGE)

    A001EOIE02
    *1 ECM Connector

    1. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A14-5 (FC) - E3-1 (E1) Engine switch on (IG) 11 to 14 V

    NG

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

    OK

    REPLACE ECM Click here

  5. INSPECT ECM POWER SOURCE CIRCUIT


    1. Inspect the ECM power source circuit Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT FUEL PUMP RELAY (F/PMP)


    1. Inspect the F/PMP relay Click here.


    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  7. INSPECT FUEL PUMP ASSEMBLY

    A001BCAE02
    *1 Component without harness connected: (Fuel Pump)

    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
        4 - 5 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 ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY (F/PMP), BODY GROUND)

    A001EKIE01
    *1 Front view of wire harness connector: (to Fuel Pump)
    *2 Engine room No. 2 relay block

    1. Check the harness and connector between the fuel pump and F/PMP relay.


      1. Disconnect the S11 fuel pump connector.

      2. Remove the F/PMP relay from the engine room No. 2 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
        S11-4 - F/PMP relay (3) Always Below 1 Ω
        Standard resistance (Check for short)
        Tester Connection Condition Specified Condition
        S11-4 or F/PMP relay (3) - Body ground Always 10 kΩ or higher

      4. Reconnect the fuel pump connector.

      5. Reinstall the F/PMP relay.

    2. Check the harness and connector between the fuel pump and body ground.


      1. Disconnect the S11 fuel pump connector.

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

        Standard resistance (Check for open)
        Tester Connection Condition Specified Condition
        S11-5 - Body ground Always Below 1 Ω

      3. Reconnect the fuel pump connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - FUEL PUMP RELAY (F/PMP))

    A001DLOE04
    *1 Engine room No. 2 relay block

    1. Remove the C/OPN relay and F/PMP relay 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 (3) - F/PMP relay (4) 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

    OK

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

    NG

    REPAIR OR REPLACE ENGINE ROOM NO. 2 RELAY BLOCK, JUNCTION BLOCK

  10. INSPECT FUEL PUMP RELAY (F/PMP)


    1. Inspect the F/PMP relay Click here.


    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  11. INSPECT FUEL PUMP RESISTOR (RESISTANCE)

    A001ALVE02

    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

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


    1. A001C2ME02
      *1 Engine room No. 2 relay block
      *2 Front view of wire harness connector: (to Fuel Pump Resistor)

      Check the harness and connector between the fuel pump relay and fuel pump resistor.


      1. Remove the F/PMP relay 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
        F/PMP relay (4) - A16-1 Always Below 1 Ω
        Standard resistance (Check for short)
        Tester Connection Condition Specified Condition
        F/PMP relay (4) or A16-1 - Body ground Always 10 kΩ or higher

      4. Reinstall the F/PMP relay.

      5. Reconnect the fuel pump resistor connector.

    2. A00197ME02
      *1 Front view of wire harness connector: (to Fuel Pump Resistor)
      *2 Front view of wire harness connector: (to Fuel Pump)

      Check the harness and connector between the fuel pump resistor and fuel pump.


      1. Disconnect the A16 fuel pump resistor connector.

      2. Disconnect the S11 fuel pump connector.

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

        Standard resistance (Check for open)
        Tester Connection Condition Specified Condition
        A16-2 - S11-4 Always Below 1 Ω
        Standard resistance (Check for short)
        Tester Connection Condition Specified Condition
        A16-2 or S11-4 - Body ground Always 10 kΩ or higher

      4. Reconnect the fuel pump resistor connector.

      5. Reconnect the fuel pump connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here