Knock Sensor Removal

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

  1. DISCHARGE FUEL SYSTEM PRESSURE

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

  3. DRAIN ENGINE COOLANT

  4. REMOVE INTAKE MANIFOLD ASSEMBLY

  5. REMOVE KNOCK SENSOR

Knock Sensor -- Removal



1. DISCHARGE FUEL SYSTEM PRESSURE
NOTICE:
  1. Perform the following procedures to prevent fuel from spilling out before removing any fuel system parts.
  1. Pressure will still remain in the fuel line even after performing the following procedures. When disconnecting the fuel line, cover it with a shop rag or a piece of cloth to prevent fuel from spraying.

  1. Remove the F/PMP fuse.

    1. Remove the engine room No. 2 relay block cover upper.

    2. Remove the F/PMP fuse.

    3. Start the engine.

    4. After the engine has stopped, turn the engine switch off.

      HINT:
      DTC P0171/25 (fuel problem) and/or P0191/49 (fuel pressure sensor signal error) may be detected.

    5. Crank the engine again. Check that the engine does not start.

    6. Remove the fuel tank cap to discharge pressure from the fuel tank.

    7. Reinstall the F/PMP fuse.

  1. Disconnect the fuel pump connector.

    1. Remove the rear seat cushion.

    2. Remove the rear floor service hole cover.

    3. Disconnect the fuel pump connector.

    4. Start the engine.

    5. After the engine has stopped, turn the engine switch off.

      HINT:
      DTC P0171/25 (fuel problem) and/or P0191/49 (fuel pressure sensor signal error) may be detected.

    6. Crank the engine again. Check that the engine does not start.

    7. Remove the fuel tank cap to discharge pressure from the fuel tank.

    8. Reconnect the fuel pump connector.

    9. Install the rear floor service hole cover.

    10. Install the rear seat.



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. 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 vent plug.



  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 Grs190.3Uz-Fe Engine Control System.Sfi System.Knock Sensor Removal



4. REMOVE INTAKE MANIFOLD ASSEMBLY

  1. Perform removal procedure (Click here).



5. REMOVE KNOCK SENSOR


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

  1. Disconnect the 2 knock sensor connectors.

  1. Remove the 2 nuts and 2 knock sensors.