СИСТЕМА SFI 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 if there is pressure in the fuel inlet hose Click here.

      Tech Tips

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


    OK

    Click here

    NG

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


    1. Connect an 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)

    A01GMXK

    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)

    A01GJ89E43

    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

    OK

    REPLACE ECM Click here

    NG

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

  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. A01GM2DE06

      Remove the 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
      Tester Connection Condition Specified Condition
      3 - 4 When no battery voltage is applied to terminals 1 and 2 Below 1 Ω
      3 - 4 When battery voltage is applied to terminals 1 and 2 10 kΩ or more

    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  7. INSPECT FUEL PUMP

    A01GLTAE02

    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 Click here

    OK

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

    A01GJL9E01

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


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

      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
        F/PMP relay (3) - 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

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A01GNAVE01

    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

    NG

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

    OK

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

  10. INSPECT FUEL PUMP RELAY (F/PMP)


    1. A01GM2DE06

      Remove the 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
      Tester Connection Condition Specified Condition
      3 - 4 When no battery voltage is applied to terminals 1 and 2 Below 1 Ω
      3 - 4 When battery voltage is applied to terminals 1 and 2 10 kΩ or more

    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  11. INSPECT FUEL PUMP RESISTOR (RESISTANCE)

    A01GHN0E01

    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 RELAY (F/PMP) - FUEL PUMP RESISTOR)

    A01GKBUE01

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (FUEL PUMP RESISTOR - FUEL PUMP)

    A01GMQTE01

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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