2009 Lexus GS 350 AWDFACTORY OEM SERVICE PROCEDURE

Knock Sensor: Removal: Removal

WARNING:

Do not allow fuel to spray when removing the pipe between the high pressure side fuel pump and the fuel injectors. The fuel in the pipe is highly pressurized.



  1. DISCHARGE FUEL SYSTEM PRESSURE  . Refer to REMOVAL - Step 2
  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    WARNING:

    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  . Refer to REPLACEMENT - Step 5
  4. REMOVE COOL AIR INTAKE DUCT SEAL  . Refer to REMOVAL - Step 15
  5. REMOVE ENGINE ROOM SIDE COVER RH  . Refer to REMOVAL - Step 16
  6. REMOVE ENGINE ROOM SIDE COVER LH  . Refer to REMOVAL - Step 17
  7. REMOVE V-BANK COVER  . Refer to REMOVAL - Step 18
  8. REMOVE FRONT UPPER FENDER PROTECTOR LH  . Refer to REMOVAL - Step 4
  9. REMOVE FRONT UPPER FENDER PROTECTOR RH  . Refer to REMOVAL - Step 5
  10. REMOVE FRONT FENDER TO COWL SIDE SEAL LH  . Refer to REMOVAL - Step 8
  11. REMOVE FRONT FENDER TO COWL SIDE SEAL RH  . Refer to REMOVAL - Step 9
  12. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY LH  . Refer to REMOVAL - Step 6
  13. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY RH  . Refer to REMOVAL - Step 7
  14. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY  . Refer to REMOVAL - Step 10
  15. DISCONNECT NO. 2 VENTILATION HOSE  See step  7
  16. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE  See step  8
  17. REMOVE THROTTLE BODY  See step  9
  18. REMOVE INTAKE AIR SURGE TANK  . Refer to REMOVAL - Step 19
  19. REMOVE INTAKE MANIFOLD  . Refer to REMOVAL - Step 20
  20. DISCONNECT WATER HOSE JOINT  . Refer to REMOVAL - Step 21
  21. REMOVE FUEL PRESSURE PULSATION DAMPER  . Refer to REMOVAL - Step 17
  22. REMOVE NO. 1 FUEL PIPE  . Refer to REMOVAL - Step 23
  23. DISCONNECT NO. 2 FUEL PIPE  . Refer to REMOVAL - Step 26
  24. REMOVE FUEL PUMP ASSEMBLY  . Refer to REMOVAL - Step 24
  25. REMOVE NO. 2 FUEL PIPE  . Refer to REMOVAL - Step 26
  26. REMOVE NO. 3 FUEL PIPE  . Refer to REMOVAL - Step 27
  27. REMOVE NO. 2 FUEL DELIVERY PIPE  . Refer to REMOVAL - Step 28
  28. REMOVE NO. 1 FUEL DELIVERY PIPE  . Refer to REMOVAL - Step 29
  29. REMOVE FUEL INJECTOR ASSEMBLY  . Refer to REMOVAL - Step 30
  30. REMOVE FUEL INJECTOR SEAL  . Refer to REMOVAL - Step 31
  31. REMOVE KNOCK SENSOR 
    1. Disconnect the 2 knock sensor connectors.
      Fig 1: Identifying Knock Sensor
      GTY104594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 bolts and 2 knock sensors.
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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.

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