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

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DTC Code DTC Name
  Fuel Pump Control Circuit
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DESCRIPTION

The fuel pump (for low pressure side) circuit consists of the ECM, fuel pump (for low pressure side) and fuel pump control ECU (which operates the fuel pump (for low pressure side)). 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 control ECU. Based on the signal sent from the ECM, the fuel pump control ECU adjusts the fuel pump (for low pressure side) 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 procedure.

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PROCEDURE


  1. *1 Fuel Pump Control ECU - -
    Click here

    INSPECT FUEL PUMP CONTROL ECU


    1. Remove the fuel pump control ECU.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L83-1 (+B) - L83-3 (GND) Always 200 Ω or higher
      L83-1 (+B) - L83-2 (FPC) Always 2 kΩ or higher
      L83-2 (FPC) - L83-3 (GND) Always 10 kΩ or higher
      L84-1 (FPG) - L83-3 (GND) Always 1 kΩ or higher
      L84-2 (FPU) - L83-3 (GND) Always 2 kΩ or higher
      L84-3 (FPV) - L83-3 (GND) Always 2 kΩ or higher
      L84-4 (FPW) - L83-3 (GND) Always 2 kΩ or higher
      Tip:

      This procedure checks for an internal short of the fuel pump control ECU when its transistor is stuck on.

      Result
      Proceed to
      OK
      NG

  2. Click here

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL PUMP CONTROL ECU)


    1. Disconnect the fuel pump control ECU connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L83-1 (+B) - L83-3 (GND) Power switch on (IG) 11 to 14 V
      Tip:

      Make a note of the measured voltage as it may be used in a following Active Test.

      Result
      Proceed to
      OK
      NG

  3. Click here

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


    1. Disconnect the fuel pump control 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
      L83-2 (FPC) - A56-18 (FPC) Always Below 1 Ω
      L83-2 (FPC) or A56-18 (FPC) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. *1 Fuel Pump Control ECU - -
    Click here

    PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)


    1. Disconnect the L84 fuel pump control ECU connector.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.


      1. Powertrain > Engine > Active Test
        Tester Display
        Fuel Pump Single Phase Energization




    6. Operate the fuel pump control ECU 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
      L84-2 (FPU) - Body ground U Phase 4.4 to 8.4 V*
      L84-3 (FPV) - Body ground V Phase 4.4 to 8.4 V*
      L84-4 (FPW) - Body ground W Phase 4.4 to 8.4 V*
      Tip:

      • *: This Active Test restricts the fuel pump control ECU output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU will be approximately 50% of the power source voltage measured in a previous step.

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

      Result
      Result Proceed to
      The U phase, V phase and W phase are all normal A
      The U phase, V phase or W phase is abnormal B
      The U phase, V phase and W phase are all abnormal C

  5. Click here

    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
      L84-2 (FPU) - L22-3 (BLPU) Always Below 1 Ω
      L84-3 (FPV) - L22-4 (BLPV) Always Below 1 Ω
      L84-4 (FPW) - L22-2 (BLPW) Always Below 1 Ω
      L84-2 (FPU) or L22-3 (BLPU) - Body ground and other terminals Always 10 kΩ or higher
      L84-3 (FPV) or L22-4 (BLPV) - Body ground and other terminals Always 10 kΩ or higher
      L84-4 (FPW) or L22-2 (BLPW) - Body ground and other terminals Always 10 kΩ or higher
      Tip:

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

      Click here

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    INSPECT ECM (FPC TERMINAL)


    1. Disconnect the fuel pump control ECU connector.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.


      1. Powertrain > Engine > Active Test
        Tester Display
        Fuel Pump Single Phase Energization




    6. Operate the fuel pump control ECU using the Active Test function and measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection GTS Operation Specified Condition
      L83-2 (FPC)- Body ground Before Active Test → During Active Test Before Active Test: Resistance is stable → During Active Test: Resistance fluctuates*
      Tip:

      *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the FPC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF EFI-MAIN NO. 2 RELAY)


    1. B004XU5C01
      *1 No. 2 Luggage Room Relay Block and Junction Block Assembly
      *2 EFI-MAIN NO. 2 Relay

      Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 2 relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

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

  8. Click here

    INSPECT EFI-MAIN NO. 2 RELAY


    1. Inspect the EFI-MAIN NO. 2 relay.

      Click here

      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)


    1. Remove the EFI-MAIN NO. 1 relay and A/F HTR relay from the No. 1 engine room relay block and junction block assembly.

      Tip:

      Remove the A/F HTR relay connected between the checked terminals as the coil inside the relay influences the measurement value.

    2. Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction 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. 1 relay) - 2 (EFI-MAIN NO. 2 relay) Always Below 1 Ω
      3 (EFI-MAIN NO. 1 relay) or 2 (EFI-MAIN NO. 2 relay) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

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


    1. Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction block assembly.

    2. 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) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

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


    1. Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction 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
      5 (EFI-MAIN NO. 2 relay) - L83-1 (+B) Always Below 1 Ω
      5 (EFI-MAIN NO. 2 relay) or L83-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. Click here

    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
      L83-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      GO TO ECM POWER SOURCE CIRCUITClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR