SFI SYSTEM(w/o Canister Pump Module) Fuel Pump Control Circuit

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 between 3 settings.

WIRING DIAGRAM

B0065ZCE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. 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 / Active Test / Control the Fuel Pump/Speed.


      Powertrain > Engine > Active Test
      Tester Display
      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 the fuel pump.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT FUEL PUMP CONTROL ECU (POWER SOURCE VOLTAGE) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (ECM - FUEL PUMP CONTROL ECU - FUEL PUMP (FOR LOW PRESSURE SIDE))


    1. Disconnect the ECM connector.

    2. Disconnect the fuel pump control ECU connector.

    3. Disconnect the fuel pump (for low pressure side) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-17 (FPC) - U27-1 (FPC) Always Below 1 Ω
      U29-1 (FP) - U25-4 (B2) Always Below 1 Ω
      U29-2 (FP-) - U25-5 (E2) Always Below 1 Ω
      A77-17 (FPC) or U27-1 (FPC) - Body ground Always 10 kΩ or higher
      U29-1 (FP) or U25-4 (B2) - Body ground Always 10 kΩ or higher
      U29-2 (FP-) or U25-5 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE FUEL PUMP CONTROL ECU


    1. Replace the fuel pump control ECU.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 10 Click here

  4. INSPECT FUEL PUMP CONTROL ECU (POWER SOURCE VOLTAGE)

    B00666YC01
    *a

    Front view of wire harness connector

    (to Fuel Pump Control ECU)

    1. Disconnect the fuel pump control 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 Condition Specified Condition
      U27-4 (+B) - Body Ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT RELAY (C/OPN) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - FUEL PUMP (FOR LOW PRESSURE SIDE))


    1. Disconnect the fuel pump control ECU connector.

    2. Disconnect the fuel pump (for low pressure side) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U29-1 (FP) - U25-4 (B2) Always Below 1 Ω
      U29-2 (FP-) - U25-5 (E2) Always Below 1 Ω
      U29-1 (FP) or U25-4 (B2) - Body ground Always 10 kΩ or higher
      U29-2 (FP-) or U25-5 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE)


    1. Inspect the fuel pump (for low pressure side).

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) Click here

    OK

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


    1. Disconnect the fuel pump control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U27-3 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ECM - FUEL PUMP CONTROL ECU)


    1. Disconnect the ECM connector.

    2. Disconnect the fuel pump control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-17 (FPC) - U27-1 (FPC) Always Below 1 Ω
      A77-14 (DI) - U27-2 (DI) Always Below 1 Ω
      A77-17 (FPC) or U27-1 (FPC) - Body ground Always 10 kΩ or higher
      A77-14 (DI) or U27-2 (DI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE FUEL PUMP CONTROL ECU


    1. Replace the fuel pump control ECU.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the fuel pump operation.

      Click here

      OK
      Malfunction has been repaired successfully.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE ECM Click here

  11. INSPECT RELAY (C/OPN)


    1. Inspect the C/OPN relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (C/OPN)

    OK

  12. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP CONTROL ECU)


    1. Remove the C/OPN relay from the No. 3 engine room relay block assembly.

    2. Disconnect the fuel pump control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (C/OPN relay) - U27-4 (+B) Always Below 1 Ω
      3 (C/OPN relay) or U27-4 (+B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (EFI MAIN NO. 2 RELAY - C/OPN RELAY)


    1. Remove the EFI MAIN NO. 2 relay from the No. 3 engine room relay block assembly.

    2. Remove the C/OPN relay from the No. 3 engine room relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (EFI MAIN NO. 2 relay) - 5 (C/OPN relay) Always Below 1 Ω
      3 (EFI MAIN NO. 2 relay) - 1 (C/OPN relay) Always Below 1 Ω
      3 (EFI MAIN NO. 2 relay) or 5 (C/OPN relay) - Body ground Always 10 kΩ or higher
      3 (EFI MAIN NO. 2 relay) or 1 (C/OPN relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. INSPECT RELAY (EFI MAIN NO. 2)


    1. Inspect the EFI MAIN NO. 2 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (EFI MAIN NO. 2)

    OK

  15. CHECK HARNESS AND CONNECTOR (EFI MAIN NO. 2 RELAY - ECM)


    1. Remove the EFI MAIN NO. 2 relay from the No. 3 engine room relay block assembly.

    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
      1 (EFI MAIN NO. 2 relay) - A77-3 (MREL) Always Below 1 Ω
      1 (EFI MAIN NO. 2 relay) or A77-3 (MREL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (EFI MAIN NO. 2 RELAY - BODY GROUND)


    1. Remove the EFI MAIN NO. 2 relay from the No. 3 engine room relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (EFI MAIN NO. 2 relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI MAIN NO. 2 RELAY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR