SFI SYSTEM Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 Click here.

WIRING DIAGRAM

Refer to DTC P0230 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FUEL PUMP OPERATION


    1. Check the fuel pump operation Click here.


    NG

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY) Click here

    OK

  2. INSPECT F/PMP RELAY


    1. A0160W2

      Remove the F/PMP relay from the engine room No. 2 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 applied to terminals 1 and 2 Below 1 Ω
      3 - 4 When battery voltage applied to terminals 1 and 2 10 kΩ or higher

    3. Reinstall the F/PMP relay.


    NG

    REPLACE F/PMP RELAY

    OK

  3. INSPECT FUEL PUMP RESISTOR


    1. A0160DYE01

      Disconnect the fuel pump resister 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 resister connector.


    NG

    REPLACE FUEL PUMP RESISTOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTOR)


    1. A0161NHE07

      Remove the F/PMP relay from the engine room No. 2 relay block.

    2. Disconnect the fuel pump resistor connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F/PMP relay (4) - Fuel pump resistor (A40-2) Always Below 1 Ω
      F/PMP relay (3) - Fuel pump resistor (A40-1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Fuel pump relay (4) or Fuel pump resistor (A40-2) - Body ground Always 10 kΩ or higher
      Fuel pump relay (3) or Fuel pump resistor (A40-1) - Body ground Always 10 kΩ or higher

    4. Reinstall the F/PMP relay.

    5. Reconnect the fuel pump resister connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester ON.

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

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

      OK
      Operating noise can be heard from the relay.

    NG

    INSPECT FUSE (F/PMP FUSE) Click here

    OK

  6. INSPECT FUEL PUMP


    1. A0162IOE01

      Inspect fuel pump resistance.


      1. Remove the fuel pump.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        4 - 5 20°C (68°F) 0.2 to 3.0 Ω

    2. Inspect fuel pump operation.


      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 the voltage on and off on the battery side, not the fuel pump side.

      2. Reinstall the fuel pump.


    NG

    REPLACE FUEL PUMP Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY AND BODY GROUND)


    1. A0161KWE04

      Disconnect the fuel pump connector.

    2. Remove the F/PMP relay from the engine room No. 2 relay block.

    3. Check the harness and the connectors between the fuel pump and the F/PMP relay.


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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        Fuel pump (Q14-4) - F/PMP relay (4) Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        Fuel pump (Q14-4) or F/PMP (4) - Body ground Always 10 kΩ or higher

    4. Check the harness and the connectors between the fuel pump and body ground.


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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        Fuel pump (Q14-5) - Body ground Always 10 kΩ or higher

    5. Reinstall the F/PMP relay to the engine room No. 2 relay block.

    6. Reconnect the fuel pump connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - F/PMP RELAY)


    1. A01632XE01

      Remove the integration relay from the engine room No. 2 relay block.

    2. Remove the F/PMP relay from the engine room No. 2 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
      Integration relay (2B-8) - F/PMP relay (1) Always Below 1 Ω
      Integration relay (2B-8) - F/PMP relay (3) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C/OPN relay (2B-8) or F/PMP relay (1) - Body ground Always 10 kΩ or higher
      C/OPN relay (2B-8) or F/PMP relay (3) - Body ground Always 10 kΩ or higher

    4. Reinstall the relays.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)


    1. A015YTIE01

      Disconnect the fuel pump connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      Fuel pump (Q14-5) - Body ground Always Below 1 Ω

    3. Reconnect the fuel pump connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.

      OK
      No leaks or blockage

    NG

    REPAIR OR REPLACE FUEL LINE

    OK

    REPAIR OR REPLACE FUEL SYSTEM (PRESSURE REGULATOR AND FUEL FILTER)

  11. INSPECT FUSE (F/PMP FUSE)


    1. A015YXDE02

      Remove the F/PMP fuse from the engine room No. 2 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F/PMP fuse Always Below 1 Ω

    3. Reinstall F/PMP the fuse.


    NG

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE (F/PMP FUSE)

    OK

  12. INSPECT INTEGRATION NO.1 RELAY (EFI NO. 2 RELAY)


    1. A015ZGTE05

      Remove the integration relay from the engine room No. 2 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-4 - 2C-1 When no battery voltage applied to terminals 2B-3 and 2B-2 10 kΩ or higher
      2B-4 - 2C-1 When battery voltage applied to terminals 2B-3 and 2B-2 Below 1 Ω

    3. Reinstall the integration relay.


    NG

    REPLACE INTEGRATION NO.1 RELAY Click here

    OK

  13. INSPECT INTEGRATION NO.1 RELAY (C/OPN RELAY)


    1. A015ZGTE05

      Remove the integration relay from the engine room No. 2 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-6 - 2B-8 When no battery voltage applied to terminals 2B-6 and 2B-7 10 kΩ or higher
      2B-6 - 2B-8 When battery voltage applied to terminals 2B-6 and 2B-7 Below 1 Ω

    3. Reinstall the integration relay.


    NG

    REPLACE INTEGRATION NO.1 RELAY Click here

    OK

  14. INSPECT ECM (FC VOLTAGE)


    1. A015Z7TE93

      Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A5-5 (FC) - E6-1 (E1) Engine Switch on (IG) 11 to 14 V

    NG

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

    OK

    REPLACE ECM Click here