SFI SYSTEM Fuel Pump Control Circuit

DESCRIPTION

The fuel pump circuit consists of the ECM, fuel pump and fuel pump control 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 control ECU. Based on the signal sent from the ECM, the fuel pump control ECU adjust the fuel pump operation speed.

WIRING DIAGRAM

B0046QOE02

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.

    5. Check whether the fuel pump operating sound occurs when performing the Active Test on the GTS.

      Result
      Result Proceed to
      Fuel pump operating sound does not occur A
      Fuel pump operating sound occurs B

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. INSPECT FUEL PUMP


    1. Inspect the fuel pump.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP Click here

    OK

  3. CHECK TERMINAL VOLTAGE (FPC TERMINAL VOLTAGE)


    1. Turn the engine switch on (IG).

      B00459KC03
      *1 ECM *a

      Component with harness connected

      (ECM)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A116-32 (FPC) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT C/OPN RELAY Click here

    OK

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)


    1. B0045XVC02
      *a No. 2 Engine Room Relay Block Assembly
      *b C/OPN Relay Holder

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (C/OPN relay holder) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY - CHARGE WATER COOLER PUMP)


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

    2. Disconnect the K17 fuel suction tube with pump and gauge assembly connector.

    3. Disconnect the A115 charge water cooler pump connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (C/OPN relay holder) - K17-4 Always Below 1 Ω
      3 (C/OPN relay holder) - A115-1 Always Below 1 Ω
      3 (C/OPN relay holder) or K17-4 - Body ground and other terminals Always 10 kΩ or higher
      3 (C/OPN relay holder) or A115-1 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK FUEL SUCTION TUBE ASSEMBLY WITH PUMP AND GAUGE


    1. Disconnect the K17 fuel suction tube with pump and gauge assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K17-4 (B) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE FUEL SUCTION TUBE ASSEMBLY WITH PUMP AND GAUGE Click here

  7. INSPECT C/OPN RELAY


    1. Inspect the C/OPN relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE C/OPN RELAY

    OK

  8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)


    1. B0045XVC02
      *a No. 2 Engine Room Relay Block Assembly
      *b C/OPN Relay Holder

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2 (C/OPN relay holder) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    CHECK ECM POWER SOURCE CIRCUIT Click here