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СИСТЕМА SFI 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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INSPECTION PROCEDURE

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. Click here

    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
      N12-6 (+B) - Body Ground Engine switch on (IG) 11 to 14 V
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to fuel pump ECU)

  3. Click here

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


    1. Disconnect the fuel pump ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N12-3 (E) - Body ground Always Below 1 Ω

  4. 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) - N12-1 (FP) Always Below 1 Ω
      N1-5 (E2) - N12-2 (FP-) Always Below 1 Ω
      N1-4 (B2) or N12-1 (FP) - Body ground Always 10 kΩ or higher
      N1-5 (E2) or N12-2 (FP-) - Body ground Always 10 kΩ or higher

  5. Click here

    INSPECT FUEL PUMP


    1. Inspect the fuel pump (Click here).


  6. 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
      N12-5 (FPC) - A53-52 (FPC) Always Below 1 Ω
      N12-5 (FPC) or A53-52 (FPC) - Body ground Always 10 kΩ or higher

  7. Click here

    REPLACE FUEL PUMP ECU


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


  8. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the fuel pump operation.

      OK
      Malfunction has been repaired successfully.

  9. Click here

    INSPECT EFI NO.2 RELAY


    1. Inspect the EFI NO.2 relay (Click here).


  10. Click here

    CHECK EFI NO.2 RELAY (POWER SOURCE VOLTAGE)


    1. Remove the EFI NO.2 relay from the engine room relay block.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      EFI NO.2 relay (1) - Body ground Engine switch on (IG) 11 to 14 V
      EFI NO.2 relay (5) - Body ground Always 11 to 14 V
      Table 3. Text in Illustration
      *1 Engine Room Relay Block:
      *2 EFI NO. 2 RELAY

  11. Click here

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


    1. Remove the EFI NO.2 relay from the engine room relay block.

    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
      EFI NO.2 relay (3) - N12-6 (+B) Always Below 1 Ω
      EFI NO.2 relay (3) or N12-6 (+B) - Body ground Always 10 kΩ or higher

  12. Click here

    CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - NO. 1 INTEGRATION RELAY, BATTERY AND BODY GROUND)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the cable from the positive (+) battery terminal.

    3. Remove the EFI NO.2 relay from the engine room relay block.

    4. Remove the No. 1 integration relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      EFI NO.2 relay (1) - 1B-4 Always Below 1 Ω
      EFI NO.2 relay (5) - Battery positive (+) terminal Always Below 1 Ω
      EFI NO.2 relay (2) - Body ground Always Below 1 Ω
      EFI NO.2 relay (1) or 1B-4 - Body ground Always 10 kΩ or higher
      EFI NO.2 relay (5) or Battery positive (+) terminal - Body ground Always 10 kΩ or higher

  13. 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 GTS 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 GTS 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).

      Table 4. Text in Illustration
      *a

      Component with harness connected

      (Fuel Pump)

  14. 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
      N12-5 (FPC) - A53-52 (FPC) Always Below 1 Ω
      N12-5 (FPC) or A53-52 (FPC) - Body ground Always 10 kΩ or higher

  15. Click here

    REPLACE FUEL PUMP


    1. Replace the fuel pump (Click here).


  16. Click here

    REPLACE FUEL PUMP ECU


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


  17. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the fuel pump operation.

      OK
      Malfunction has been repaired successfully.

  18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. Click here

    REPLACE ECMClick here

  20. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. Click here

    REPLACE FUEL PUMPClick here

  23. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  24. Click here

    REPLACE ECMClick here

  25. Click here

    END

  26. Click here

    REPLACE EFI NO.2 RELAY

  27. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  28. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP RELAY - BODY GROUND)

  29. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  30. Click here

    GO TO ECM POWER SOURCE CIRCUITClick here