2012 Lexus GX 460FACTORY OEM SERVICE PROCEDURE

Fuel System: Precaution: Precaution

WARNING:
  • Before working on the fuel system, disconnect the cable from the negative (-) battery terminal.
  • Do not smoke or be near an open flame when working on the fuel system.
  • Keep gasoline away from rubber and leather parts.
  1. DISCHARGE FUEL SYSTEM PRESSURE 
    WARNING:
    • Do not disconnect any part of the fuel system until you have discharged the fuel system pressure.
    • After discharging the fuel pressure, place a cloth or equivalent over fittings as you separate them to reduce the risk of fuel spray on yourself or in the engine compartment.
    1. Disconnect the 2 fuel pump ECU connectors.
      Fig 1: Locating Fuel Pump ECU Connectors
      GTY256329Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Start the engine. After the engine stops, turn the engine switch off.

      HINT: 

      DTC P0171/0174 (system too lean) may be stored.

    3. Crank the engine again, and then check that the engine does not start.
    4. Loosen the fuel tank cap, and then discharge the pressure in the fuel tank completely.
    5. Disconnect the cable from the negative (-) battery terminal.
      NOTE:
      • w/ Navigation System:

        After the engine switch is turned off, the display and navigation module display (navigation system) records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

        Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal

        Condition Waiting Time
        Vehicle enrolled in safety connect system 6 minutes
        Vehicle not enrolled in safety connect system 1 minute
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .
    6. Connect the 2 fuel pump ECU connectors.
  2. FUEL SYSTEM 
    1. When disconnecting the high fuel pressure line, a large amount of gasoline will spill out. Follow these procedures.
      1. Perform the "DISCHARGE FUEL SYSTEM PRESSURE" procedures above.
      2. Disconnect the fuel tube.
      3. Drain any fuel remaining inside the fuel tube.
      4. To protect the disconnected fuel tube from damage and contamination, cover it with a plastic bag.
      5. Put a container under the connecting part of the pressure line.
    2. Observe these precautions when removing and installing the injectors.
      Fig 2: Identifying O-Ring, Fuel Delivery Pipe & Precautions
      GTY280432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 O-ring
      *2 Fuel Delivery Pipe
      *a CORRECT
      *b INCORRECT
      NOTE:
      • Never reuse the O-ring.
      • When placing a new O-ring on the injector, do not damage it.
      • Coat a new O-ring with spindle oil or gasoline before installing it.
      • Do not use engine oil, gear oil or brake oil.
    3. Install the injector to the delivery pipe and cylinder head as shown in the illustration.
      Fig 3: Identifying Fuel Injector
      GTY276283Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Fuel Delivery Pipe
      *2 O-ring
      *3 Fuel Injector
      *4 Insulator
      *5 Cylinder Head
      NOTE:

      Before installing the injector, apply spindle oil or gasoline on the place where the delivery pipe contacts the O-ring of the injector.

    4. Observe these precautions when disconnecting the fuel tube connector (for quick type A).
      Fig 4: Identifying Fuel Tube Connector (For Quick Type A)
      GTY284085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Fuel Hose Connector Cover Type:

        Detach the lock claw by lifting up the cover as shown in the illustration.

        TEXT IN ILLUSTRATION

        *1 Fuel Hose Connector Cover
      2. Check for dirt or mud on the pipe and around the connector before disconnection. Clean if necessary.
      3. Pinch the connector and disconnect the connector and pipe.
        Fig 5: Pinching Fuel Pipe Connector
        GTY278055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Retainer
        Pinch
        Pull

        HINT: 

        If the connector and pipe are stuck, pinch the connector, push and pull the pipe to disconnect the pipe and pull it out.

        NOTE:
        • Check for foreign matter in the pipe and around the connector. Clean if necessary. Foreign matter may damage the O-ring or cause leaks in the seal between the pipe and connector.
          Fig 6: Identifying Fuel Tube Connector Components
          GTY271521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Do not use any tools to separate the pipe and connector.
        • Do not forcefully bend or twist the nylon tube.
        • Check for foreign matter on the pipe seal surface. Clean if necessary.
        • Put the pipe and connector ends in plastic bags to prevent damage and foreign matter contamination.
        • If the pipe and connector are stuck together, pinch the connector between your fingers and turn it carefully to disconnect it.
        TEXT IN ILLUSTRATION

        *1 Retainer
        *2 Nylon Tube
        *3 Pipe
        *4 O-ring
        *5 Fuel Tube Connector
      4. Check for dirt or mud on the seal surface of the disconnected pipe. Clean if necessary.
      5. To protect the disconnected pipe and connector from damage and contamination, cover them with a plastic bag.
    5. Observe these precautions when connecting the fuel tube connector (for quick type A).
      1. Before connecting the connector, check that there is no damage or contamination in the connecting part of the pipe.
      2. Align the axis of the connector with the axis of the pipe. Push the pipe into the connector until the connector makes a "click" sound. If the connection is tight, apply a small amount of fresh spindle oil or gasoline to the tip of the pipe.
        Fig 7: Pushing Connector Onto Pipe
        GTY269690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        Push
      3. After connecting the pipe and connector, check that the pipe and connector are securely connected by trying to pull them apart.
        Fig 8: Checking For Secure Connection
        GTY269691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        Pull
      4. Fuel Hose Connector Cover Type:

        Attach the lock claws to the connector by pushing down on the cover.

      5. Check for any fuel leaks.
    6. Observe these precautions when disconnecting the fuel tube connector (for quick type B).
      1. Check that there is no damage or foreign matter on the part of the pipe that contacts the connector.
      2. Detach the 2 claws of the connector retainer. Push the retainer out and disconnect the connector from the pipe.
        Fig 9: Disconnecting Fuel Tube Connector
        GTY225980Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Retainer
        Push
        Push Out
        Pull

        HINT: 

        If the connector and pipe are stuck, pinch the fuel pipe by hand and push and pull the connector to disconnect it.

        Fig 10: Disconnecting Stuck Pipe & Connector
        GTY104528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        Pull
        Push
        NOTE:
        • Check for any dirt and foreign matter contamination in the pipe and around the connector. Clean if necessary. Foreign matter may damage the O-ring or cause leaks in the seal between the pipe and connector.
          Fig 11: Identifying Pipe Connector Components
          GTY262514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Do not use any tools to separate the pipe and connector.
        • Do not allow any scratches or foreign matter on the parts when disconnecting them, as the fuel tube joint contains the O-rings that seal the plug.
        • Check for any dirt and foreign matter on the pipe seal surface. Clean if necessary.
        • Do not forcibly bend, twist or turn the nylon tube.
        • Protect the disconnected part by covering it with a plastic bag and tape after disconnecting the main tube.
        • If the pipe and connector are stuck together, pinch the tube between your fingers and turn it carefully to free it. Then disconnect the main tube.
        TEXT IN ILLUSTRATION

        *1 Pipe
        *2 Retainer
        *3 Nylon Tube
        *4 Connector
        *5 O-ring
      3. Check for foreign matter on the seal surface of the disconnected pipe. Clean if necessary.
      4. To protect the disconnected pipe and connector from damage and foreign matter, cover them with a plastic bag.
    7. Observe these precautions when connecting the fuel tube connector (for quick type B).
      1. Check for foreign matter on the pipe and around the connector before connecting it. Clean if necessary.
      2. Align the axis of the connector with the axis of the pipe. Push the connector onto the pipe, and then push in the retainer.
        Fig 12: Pushing Connector Onto Pipe
        GTY263244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Retainer
        Push In
        Push
        NOTE:
        • Before connecting the tube connectors to the pipes, check if there is any damage or foreign matter in the connectors.
        • After connecting the pipe and connector, check that the pipe and connector are securely connected by trying to pull them apart.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.