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СИСТЕМА SFI (для моделей с вспомогательной системой подачи воздуха в нейтрализатор) Fuel Pump Control Circuit

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DTC Code DTC Name
  Fuel Pump Control Circuit
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DESCRIPTION

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Check whether operating sounds can be heard while operating the fuel pump using the GTS.

      OK
      Operating sounds can be heard from fuel pump.
      Table 1. Result
      Result Proceed to
      NG A
      OK B

  2. Table 2. *a Component with harness connected: (Fuel Pump)
    Click here

    PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP)


    1. Remove the fuel tank assembly (Click here).

    2. Remove the fuel pump from the fuel tank assembly.

    3. Clean the fuel pump to completely remove any remaining fuel.

    4. Connect the fuel pump connector.

      CAUTION:

      Confirm that no fuel remains inside or on the outside of the fuel pump.

    5. Connect the GTS to the DLC3.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty.

    9. Operate the fuel pump using the Active Test function and measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Tester Operation Specified Condition
      1 - 2 FPC Duty: 25% 3.2 to 4.05 V
      FPC Duty: 80% 8.8 to 12.5 V

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

    11. Operate the fuel pump using the Active Test function and measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Tester Operation Specified Condition
      1 - 2 ON (FPC Duty: 90%) 9.0 to 14.0 V
      Tip:

      • Be sure to measure the voltage with all of the connectors connected.

      • Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).


  3. Click here

    CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)


    1. Disconnect the fuel pump ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N14-5 (FPC) - A38-50 (FPC) Always Below 1 Ω
      N14-5 (FPC) or A38-50 (FPC) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    REPLACE FUEL PUMP


    1. Replace the fuel pump (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the fuel pump (Click here).


  5. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the fuel pump operation.

      OK
      Malfunction has been repaired successfully.

  6. Click here

    REPLACE FUEL PUMP ECU


    1. Replace the fuel pump ECU (Click here).


  7. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the fuel pump operation.

      OK
      Malfunction has been repaired successfully.

  8. Table 3. *1 Front view of wire harness connector: (to Fuel Pump ECU)
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    INSPECT FUEL PUMP ECU (POWER SOURCE VOLTAGE)


    1. Disconnect the fuel pump ECU connector.

    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
      N14-6 (+B) - Body Ground Engine switch on (IG) 11 to 14 V

  9. Click here

    CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)


    1. Disconnect the fuel pump connector.

    2. Disconnect the fuel pump ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N1-4 (B2) - N14-1 (FP) Always Below 1 Ω
      N1-5 (E2) - N14-2 (FP-) Always Below 1 Ω
      N1-4 (B2) or N14-1 (FP) - Body ground Always 10 kΩ or higher
      N1-5 (E2) or N14-2 (FP-) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    INSPECT FUEL PUMP


    1. Inspect the fuel pump (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the fuel pump (Click here).


  11. Click here

    CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)


    1. Disconnect the fuel pump ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-50 (FPC) - N14-5 (FPC) Always Below 1 Ω
      N14-3 (E) - Body ground Always Below 1 Ω
      A38-50 (FPC) or N14-5 (FPC) - Body ground Always 10 kΩ or higher

    • OK

      REPLACE FUEL PUMP ECU (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - FUEL PUMP ECU)


    1. Disconnect the fuel pump ECU connector.

    2. Disconnect the No. 2 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1R-6 - N14-6 (+B) Always Below 1 Ω
      1R-6 or N14-6 (+B) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. Click here

    INSPECT NO. 2 INTEGRATION RELAY (FUEL PMP)


    1. Inspect the No. 2 integration relay (FUEL PMP) (Click here).


    • OK

      GO TO ECM POWER SOURCE CIRCUIT (Click here)

    • NG

      REPLACE NO. 2 INTEGRATION RELAY