Knock Sensor Removal

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

  1. DISCHARGE FUEL SYSTEM PRESSURE

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

  3. REMOVE COOL AIR INTAKE DUCT SEAL

  4. REMOVE ENGINE UNDER COVER

  5. DRAIN ENGINE COOLANT

  6. REMOVE ENGINE ROOM SIDE COVER RH

  7. REMOVE V-BANK COVER

  8. REMOVE NO. 2 VENTILATION HOSE

  9. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE

  10. REMOVE WATER BY-PASS HOSE

  11. DISCONNECT UNION TO CHECK VALVE HOSE

  12. DISCONNECT VENTILATION HOSE

  13. DISCONNECT FUEL MAIN TUBE

  14. REMOVE INTAKE AIR SURGE TANK

  15. REMOVE INTAKE MANIFOLD

  16. REMOVE KNOCK SENSOR

Knock Sensor -- Removal



1. DISCHARGE FUEL SYSTEM PRESSURE
CAUTION:
  1. Do not disconnect any part of the fuel system until you have discharged the fuel system pressure.
  2. Even 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 cable from the negative (-) battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Disconnect the fuel pump connector.

  1. Connect the cable to the negative (-) battery terminal.

  1. Start the engine. After the engine has stopped on its own, turn the engine switch off.

    NOTICE:
    DTC P0171/P0172 (system too lean) may be set.

  1. Crank the engine again, then check that the engine does not start.

  1. Loosen the fuel tank cap, then discharge the pressure in the fuel tank completely.

  1. Connect the fuel pump connector.



2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.


3. REMOVE COOL AIR INTAKE DUCT SEAL


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Remove the 7 clips and duct seal.



4. REMOVE ENGINE UNDER COVER


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Using a clip remover, remove the 3 clips.

  1. Remove the 10 screws and under cover.



5. DRAIN ENGINE COOLANT
CAUTION:
Do not remove the radiator cap while the engine and radiator are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

  1. Remove the radiator cap and reservoir cap.



  1. Loosen the radiator drain cock plug and 2 cylinder block drain cock plugs. Then drain the coolant.

    HINT:
    Collect the coolant in a container and dispose of it according to the regulations in your area.


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal



6. REMOVE ENGINE ROOM SIDE COVER RH


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Loosen the nut and remove the 2 clips and side cover.



7. REMOVE V-BANK COVER


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Remove the 2 nuts and V-bank cover.



8. REMOVE NO. 2 VENTILATION HOSE


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the ventilation hose from the cylinder head cover.

  1. Disconnect the clamp from the air cleaner.



9. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the MAF meter connector.

  1. Disconnect the clamp from the air cleaner.



    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the VSV (for EVAP).



    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the 4 clamps.

  1. Remove the hose clamp and air cleaner cap with air cleaner hose.



10. REMOVE WATER BY-PASS HOSE


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the 2 water by-pass hoses from the throttle body.



11. DISCONNECT UNION TO CHECK VALVE HOSE

  1. Disconnect the hose from the surge tank.



12. DISCONNECT VENTILATION HOSE


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the ventilation hose from the ventilation valve.



13. DISCONNECT FUEL MAIN TUBE


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Remove the fuel pipe clamp.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Pinch and pull the fuel hose's connector to disconnect it from the fuel pipe.

    NOTICE:

    1. Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal
      Check for foreign matter in the fuel hose and around the fuel hose's connector. Clean if necessary. Foreign matter can affect the O-ring's ability to seal the connector and fuel pipe.
    2. Do not use any tools to separate the connector and fuel pipe.
    3. Do not forcefully bend or twist the hose.
    4. Keep the connector and pipe free from foreign matter.

    5. Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal
      Put the connector in a plastic bag to prevent damage and contamination.
    6. If the connector and fuel pipe are stuck together, pinch the connector and turn it carefully to disconnect it.


14. REMOVE INTAKE AIR SURGE TANK


Lexus Gs430, Gs300. Uzs190 Grs190

  1. Disconnect the throttle motor connector.

  1. Disconnect the IACV connector.

  1. Remove the 3 wire harness clamps.

  1. For Chinese specification:
    Remove the bolt and disconnect the water hose joint.

  1. For except Chinese specification:
    Remove the bolt and disconnect the water by-pass pipe.

  1. Remove the 4 bolts and 2 surge tank stays.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Using a 5 mm hexagon socket wrench, remove the 4 bolts, 2 nuts, surge tank and gasket.

    HINT:
    Cover the intake manifold port to prevent foreign matter from entering it.


15. REMOVE INTAKE MANIFOLD


    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Remove the bolt and fuel hose from the cylinder head.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Remove the 6 bolts, 4 nuts, intake manifold and 2 gaskets.



16. REMOVE KNOCK SENSOR


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System.Knock Sensor Removal

  1. Disconnect the 2 knock sensor connectors.

  1. Remove the 2 bolts and 2 knock sensors.