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Home › Toyota › 2008 › Camry Solara SLE, 2D Convertible › Repair and Diagnosis › Engine Performance › Engine Control System (3MZ-FE) › SFI System › Fuel Pump Control Circuit › Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY TECHSTREAM (OPERATE C/OPN RELAY) 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch to the ON position, push Techstream or the OBD II scan tool main switch 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 Techstream.

      Standard: 

      Operating noise can be heard from the relay. 

    OK:  Go to step  5

    NG: Go to Next Step 

  2. INSPECT C/OPN RELAY 
    1. Remove the C/OPN relay from the engine room J/B.
    2. Measure the resistance of the C/OPN relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (When battery voltage is applied to terminals 1 and 2)
      Fig 1: Inspecting C/OPN Relay
      G04942983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RELAY 

    OK: Go to Next Step 

  3. CHECK ECM (FC VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage of the ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      FC (E4-10) - E1 (E6-1) 9 to 14 V
      Fig 2: Identifying ECM Connector
      G05128700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

    NG: Go to Next Step 

  4. CHECK WIRE HARNESS (ECM - C/OPN RELAY, C/OPN RELAY - IGNITION) 
    1. Check the wire harness between the ECM and C/OPN relay.
      1. Disconnect the ECM connector.
      2. Remove the C/OPN relay from the engine room J/B.
        3. Fig 3: Identifying C/OPN Relay From Engine Room J/B
        G05587346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance 

        RESISTANCE SPECIFIED CONDITION

        Terminal Connections Specified Condition
        FC (E4-10) - C/OPN relay (2) Below 1 Ω
        FC (E4-10) or C/OPN relay (2) - Body ground 10 kΩ or higher
    2. Check the wire harness between the C/OPN relay and ignition switch.
      1. Check the IG2 fuse.
        • Remove the IG2 fuse from the engine room J/B.
        • Check the resistance of the IG2 fuse.

          Standard resistance: 

          Below 1 Ω 

        • Reinstall the IG2 fuse.
      2. Remove the C/OPN relay from the engine room J/B.
      3. Disconnect the ignition switch connector.
      4. Measure the resistance of the wire harness side connectors.

        Standard resistance 

        RESISTANCE SPECIFIED CONDITION

        Terminal Connections Specified Condition
        J/B C/OPN relay terminal 1 - I15-6 Below 1 Ω
        J/B C/OPN relay terminal 1 or I15-6 -Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

  5. INSPECT FUEL PUMP 
    1. Measure the resistance of the fuel pump.
      Fig 4: Identifying Fuel Pump Connector
      G05128702Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance between terminals 4 and 5.

        Standard resistance 

        RESISTANCE SPECIFIED CONDITION

        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 the fuel pump side.

    NG: REPLACE FUEL PUMP 

    OK: Go to Next Step 

  6. CHECK WIRE HARNESS (C/OPN RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) 
    1. Check the wire harness between the C/OPN relay and fuel pump.
      1. Remove the C/OPN relay from the engine room J/B.
        2. Fig 5: Identifying C/OPN Relay From Engine Room J/B And Fuel Pump Connector
        G05587348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the fuel pump connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        C/OPN relay terminal 3 - F8-4 Below 1 Ω
        C/OPN relay terminal 3 or F8-4 - Body ground 10 kΩ or higher
    2. Check the wire harness between the fuel pump and body ground.
      1. Disconnect the fuel pump connector.
        2. Fig 6: Identifying Fuel Pump Connector
        G05128704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the resistance of the wire harness side connector and body ground.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        F8-5 (Fuel pump) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK ECM 

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