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Home >> Toyota >> 2007 >> 4Runner Limited, 4.0 U, 4WD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (1GR-FE) >> SFI System >> Fuel Pump Control Circuit >> Inspection Procedure
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Inspection Procedure

  1. CHECK FUEL PUMP OPERATION 
    1. Check if there is pressure in the fuel inlet hose (See ON-VEHICLE INSPECTION ).

      HINT:

      If there is fuel pressure, you will hear the sound of fuel flowing sound.

    OK: Go to step   10

    NG: GO TO NEXT STEP 

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATION OF CIRCUIT OPENING RELAY) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch on and turn the tester on.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP/ SPD.
    4. Check whether operating sounds can be heard while operating the relay using the tester.

      OK: Operating sounds can be heard from the relay. 

    OK:  Go to step  5

    NG: GO TO NEXT STEP 

  3. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the circuit opening relay from the engine room R/B.
    2. Check the circuit opening relay resistance.
      Fig 1: Identifying Circuit Opening Relay
      G04942983Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      3-5 10 kΩ or higher
      3-5 Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the circuit opening relay.

    NG: REPLACE CIRCUIT OPENING RELAY 

    OK: GO TO NEXT STEP 

  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch on.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.
      Fig 2: Identifying E6 And E8 ECM Connectors Terminals
      G04968604Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      PC (E8-10) - E1 (E6-1) 9 to 14 V

    OK: REPLACE ECM 

    NG: CHECK AND REPLACE HARNESS OR CONNECTOR (ECM - IGNITION SWITCH) 

  5. INSPECT ECM POWER SOURCE CIRCUIT 

    HINT:

    Refer to "ECM POWER SOURCE CIRCUIT " .

    NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

    OK: GO TO NEXT STEP 

  6. INSPECT FUEL PUMP RELAY 
    1. Remove the fuel pump relay the engine room R/B.
      Fig 3: Identifying Fuel Pump Relay
      G04829212Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Check the fuel pump relay resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      3-4 Below 1 Ω
      3-5 10 kΩ or higher
      3-4 10 kΩ or higher (when battery voltage applied to terminal 1 and 2)
      3-5 Below 1 Ω (when battery voltage applied to terminal 1 and 2)
    3. Reinstall the fuel pump relay.

    NG: REPLACE FUEL PUMP RELAY 

    OK: GO TO NEXT STEP 

  7. INSPECT FUEL PUMP ASSEMBLY 
    1. Inspect fuel pump resistance.
      1. Disconnect the F14 fuel pump connector.
        Fig 4: Identifying F14 Fuel Pump Connector
        G04968606Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      2. Measure the resistance between terminals 4 and 5.

        Standard resistance: 

        0.2 to 3.0 Ω at 20°C (68°F) 

    2. Inspect fuel pump operation.
      1. Apply battery voltage to both terminals. Check that the fuel 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 switch at the battery side.

    NG: REPLACE FUEL PUMP ASSEMBLY 

    OK: GO TO NEXT STEP 

  8. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY RELAY, FUEL PUMP - BODY GROUND) 
    1. Check the harness and connector between the fuel pump and circuit opening relay.
      1. Disconnect the F14 fuel pump connector.
        Fig 5: Identifying Fuel Pump Connector
        G04968607Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      2. Remove the Fuel pump relay from the engine room R/B.
      3. Measure the resistance between the terminals of the fuel pump relay and fuel pump connector.

        Standard resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump (F14-4) - Fuel pump relay (4) Below 1 Ω

        Standard resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump (F14-4) or Fuel pump relay (4) - Body ground 10 kΩ or higher
      4. Reconnect the fuel pump connector.
      5. Reinstall the engine room junction block.
    2. Check the harness and connector between the fuel pump and body ground.
      1. Disconnect the fuel pump connector.
      2. Measure the resistance between the terminal of the fuel pump connector and body ground.

        Standard resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump (F14-5) - Body ground Below 1 Ω
      3. Reconnect the fuel pump connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY) 
    1. Remove the circuit opening relay from the engine room R/B.
      Fig 6: Identifying Circuit Opening Relay
      G04968608Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Remove the fuel pump relay from the engine room R/B.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      Circuit opening relay (3) - Fuel pump relay (3) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      Circuit opening relay (3) or Fuel pump relay (3) -Body ground 10 kΩ or higher
    4. Reinstall the circuit opening relay.
    5. Reinstall the fuel pump relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPLACE HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 

  10. INSPECT FUEL PUMP RELAY 
    1. Remove the fuel pump relay from the engine room R/B.
      Fig 7: Identifying Fuel Pump Relay
      G04829212Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Check the fuel pump relay resistance.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      3-4 Below 1 Ω
      3-5 10 kΩ or higher
      3-4 10 kΩ or higher (when battery voltage applied to terminal 1 and 2)
      3-5 Below 1 Ω (when battery voltage applied to terminal 1 and 2)
    3. Reinstall the fuel pump relay.

    NG: REPLACE FUEL PUMP RELAY 

    OK: GO TO NEXT STEP 

  11. INSPECT FUEL PUMP RESISTOR (RESISTANCE) 
    1. Inspect the fuel pump resistor resistance.
      Fig 8: Inspecting Fuel Pump Resistor Resistance
      G04968610Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      1. Measure the resistance.

        Standard resistance: 

        0.70 to 0.76 Ω at 20°C (68°F) 

    NG: REPLACE FUEL PUMP RESISTOR 

    OK: GO TO NEXT STEP 

  12. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP) 
    1. Check the harness and connector between the fuel pump relay and fuel pump resistor.
      1. Remove the fuel pump relay from the engine room R/B.
      2. Disconnect the F8 fuel pump resistor connector.
      3. Check the resistance.

        Standard resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump relay (5) - Fuel pump relay resistor (F8-1) Below 1 Ω

        Standard resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump relay (5) - or Fuel pump resistor (F8-1) - Body ground 10 kΩ or higher
      4. Reinstall the fuel pump relay
      5. Reconnect the fuel pump resistor connector.
    2. Check the harness and connector between the fuel pump resistor and fuel pump.
      1. Disconnect the F18 fuel pump resistor connector.
      2. Disconnect the F14 fuel pump connector.
        Fig 9: Identifying F14 Fuel Pump Connector
        G04968611Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      3. Check the resistance.

        Standard resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump resistor (F8-2) - Fuel pump (F14-4) Below 1 Ω

        Standard resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Fuel pump resistor (F8-2) or Fuel pump (F14-4) -Body ground 10 kΩ or higher
      4. Reconnect the fuel pump resistor connector.
      5. Reconnect the fuel pump connector.

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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