SFI SYSTEM (w/ EGR System) Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 Click here.

WIRING DIAGRAM

A01NDQQE08

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following 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 RELAY (F/PMP RELAY)


    1. A01NH82E01

      Remove the F/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 No battery voltage applied to terminals 1 and 2 Below 1 Ω
      3 - 4 Battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 No battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the F/PMP relay.


    NG

    REPLACE RELAY (F/PMP RELAY)

    OK

  3. INSPECT FUEL PUMP RESISTOR


    1. Inspect the fuel pump resistor Click here.


    NG

    REPLACE FUEL PUMP RESISTOR Click here

    OK

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


    1. Remove the F/PMP relay from the engine room 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
      5 (F/PMP relay) - A93-1 Always Below 1 Ω
      4 (F/PMP relay) - A93-2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      5 (Fuel pump relay) or A93-1 - Body ground Always 10 kΩ or higher
      4 (Fuel pump relay) or A93-2 - Body ground Always 10 kΩ or higher

    4. Reinstall the F/PMP relay.

    5. Reconnect the fuel pump resistor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTOR)

    OK

    PROCEED TO NEXT SUSPECTED AREA 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 power switch on (IG) and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / 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 RELAY (C/OPN RELAY) Click here

    OK

  6. INSPECT FUEL PUMP


    1. Inspect the fuel pump Click here.


    NG

    REPLACE FUEL PUMP Click here

    OK

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


    1. Disconnect the fuel pump connector.

    2. Remove the F/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
      j2-4 - 4 (F/PMP relay terminal) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      j2-4 or 4 (F/PMP relay terminal) - Body ground Always 10 kΩ or higher

    4. Reinstall the F/PMP relay.

    5. Reconnect the fuel pump connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - F/PMP RELAY)

    OK

  8. INSPECT ENGINE ROOM RELAY BLOCK (C/OPN RELAY - F/PMP RELAY)


    1. A01NG28E02
      Text in Illustration
      *1 Engine Room Relay Block

      Remove the C/OPN relay from the engine room relay block.

    2. Remove the F/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
      3 (C/OPN relay) - 2 (F/PMP relay terminal) Always Below 1 Ω
      3 (C/OPN relay) - 3 (F/PMP relay terminal) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3 (C/OPN relay) or 2 (F/PMP relay terminal) - Body ground Always 10 kΩ or higher
      3 (C/OPN relay) or 3 (F/PMP relay terminal) - Body ground Always 10 kΩ or higher

    4. Reinstall the C/OPN relay.

    5. Reinstall the F/PMP relay.


    NG

    REPLACE ENGINE ROOM RELAY BLOCK

    OK

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


    1. 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
      j2-5 - Body ground Always Below 1 Ω

    3. Reconnect the fuel pump connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND)

    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 RELAY (C/OPN RELAY)


    1. A01ND26

      Remove the C/OPN 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 - 5 No battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the C/OPN relay.


    NG

    REPLACE RELAY (C/OPN RELAY)

    OK

  12. CHECK HARNESS AND CONNECTOR (C/OPN RELAY VOLTAGE)


    1. A01NETME02
      Text in Illustration
      *1 Engine Room Relay Block

      Remove the C/OPN relay from the engine room relay block.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      5 (C/OPN relay terminal) - Body ground Power switch on (IG) 11 to 14 V
      1 (C/OPN relay terminal) - Body ground Power switch on (IG) 11 to 14 V

    4. Reinstall the C/OPN relay.


    NG

    REPLACE ENGINE ROOM RELAY BLOCK

    OK

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


    1. Remove the C/OPN relay from the engine room relay block.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      2 (C/OPN relay terminal) - A76-8 (FC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      2 (C/OPN relay terminal) or A76-8 (FC) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the C/OPN relay.


    NG

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

    OK

    REPLACE ECM Click here