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SFI SYSTEM Fuel Pump Control Circuit

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DTC Code DTC Name
  Fuel Pump Control Circuit
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DESCRIPTION

The FUEL PUMP relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the starter-operating signal (STA) and crankshaft-rotating signal (NE).

The FUEL PUMP relay is turned ON while the engine is idling or operating at low load. This causes current to flow through the fuel pump resistor to the fuel pump. The fuel pump then operates at low speed.

The FUEL PUMP relay is turned OFF while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.

A017G5XE04
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE C/OPN RELAY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG), and turn the tester on.

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

    4. Check the relay operation while operating it using the intelligent tester.

      Standard
      Operating noise can be heard from the relay.

  2. Click here

    INSPECT TERMINAL VOLTAGE (FUEL PMP RELAY TERMINAL)


    1. A017C7NE02

      Remove the FUEL PMP relay from the engine room relay block.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      FUEL PMP relay terminal 2 - Body ground Ignition switch on (IG) 9 to 14 V
      FUEL PMP relay terminal 3 - Body ground Ignition switch on (IG) 9 to 14 V

    4. Reinstall the FUEL PMP relay.


  3. Click here

    INSPECT RELAY (FUEL PMP RELAY)


    1. A017C7Y

      Remove the FUEL PMP relay from the engine room relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 4 When no battery voltage is applied terminals 1 and 2 Below 1 Ω
      3 - 5 When no battery voltage is applied terminals 1 and 2 10 kΩ or higher
      3 - 4 When battery voltage is applied terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied terminals 1 and 2 Below 1 Ω

    3. Reinstall the FUEL PMP relay.


  4. Click here

    INSPECT FUEL PUMP RESISTOR


    1. A017BO8E01

      Disconnect the fuel pump resistor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 0.30 to 0.34 Ω

    3. Reconnect the fuel pump resistor connector.


  5. Click here

    CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PMP RELAY)


    1. A017BZ9E01

      Check the wire harness between the FUEL PMP relay and fuel pump.


      1. Remove the FUEL PMP relay from the engine room relay block.

      2. Disconnect the fuel pump connector.

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

        Standard resistance
        Tester Connection Condition Specified Condition
        FUEL PMP relay terminal 4 - O9-4 Always Below 1 Ω
        FUEL PMP relay terminal 4 or O9-4 - Body ground Always 10 kΩ or higher

  6. Click here

    CHECK HARNESS AND CONNECTOR (FUEL PUP RELAY - FUEL PUMP RESISTOR)


    1. A017FKCE01

      Disconnect the fuel pump resistor connector.

    2. Remove the FUEL PMP relay from the engine room relay block.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      FUEL PMP relay terminal (5) - A35-1 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      FUEL PMP relay terminal (5) or A35-1 - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel pump resistor connector.

    5. Reinstall the FUEL PMP relay.


  7. Click here

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


    1. A017DE3E05

      Disconnect the fuel pump resistor connector.

    2. Disconnect the fuel pump connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A35-2 - O9-4 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A35-2 or O9-4 - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel pump resistor connector.

    5. Reconnect the fuel pump connector.


  8. Click here

    INSPECT FUEL PUMP


    1. A017D3KE01

      Measure the resistance of the fuel pump.


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

        Standard resistance
        Terminal Connections Condition Specified Condition
        4 - 5 20°C (68°F) 0.2 to 0.3 Ω

    2. Check operation of the fuel pump.


      1. Apply battery voltage to both terminals. Check that the pump operates.

        Note:

        • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.

        • Keep the fuel pump as far away from the battery as possible.

        • Always turn ON and OFF the voltage on the battery side, not on the fuel pump side.


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    CHECK ECM POWER SOURCE CIRCUIT

    Tip:

    (Click here).


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    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (C/OPN RELAY)


    1. Inspect the C/OPN relay (Click here).


  11. Click here

    INSPECT ECM (FC VOLTAGE)


    1. A017BQGE20

      Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      D31-10 (FC) - B3-1 (E1) Ignition switch on (IG) 9 to 14 V

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    CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY)


    1. A017FTLE01

      Disconnect the ECM connector.

    2. Remove the engine room junction block assembly.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      D31-10 (FC) - 2D-12 (C/OPN relay terminal) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      D31-10 (FC) or 2D-12 (C/OPN relay terminal) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the engine room junction block assembly.


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    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PMP RELAY - C/OPN RELAY)

  14. Click here

    REPLACE RELAY

  15. Click here

    REPLACE FUEL PUMP RESISTORClick here

  16. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. Click here

    REPLACE FUEL PUMPClick here

  18. Click here

    REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT

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    REPLACE ENGINE ROOM JUNCTION BLOCKClick here

  20. Click here

    REPLACE ECMClick here

  21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - C/OPN RELAY)

  22. Click here

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLYClick here