2004 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Knock Sensor: Inspection

  1. REMOVE ENGINE COVER 

    Remove the 4 nuts and engine cover.

  2. REMOVE PS PUMP REAR STAY 
  3. REMOVE KNOCK SENSOR 1 
    Fig 1: Removing Knock Sensor
    G00894005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the knock sensor connector.
    2. Using SST, remove the knock sensor.
      1. SST 09816-30010
  4. REMOVE OIL DIPSTICK AND GUIDE FOR A/T (See  REMOVAL  ) 
  5. REMOVE STARTER (See  REMOVAL & INSTALLATION  ) 
  6. REMOVE KNOCK SENSOR 2 (See step 2) 
  7. INSPECT KNOCK SENSORS 

    Using an ohmmeter, check that there is no continuity between the terminal and body.

    If there is continuity, replace the sensor.

  8. Fig 2: Inspecting Knock Sensors
    G00894006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REINSTALL KNOCK SENSORS 
    1. Using SST, install the knock sensor.
      1. SST 09816-30010
      2. Torque: 44 N.m (450 kgf.cm, 33 ft.lbf) 
    2. Connect the knock sensor connector.
  10. REEINSTALL STARTER (See  REMOVAL & INSTALLATION  ) 
  11. REINSTALL OIL DIPSTICK AND GUIDE FOR A/T 

    HINT:

    Use a new O-ring.

  12. REINSTALL PS PUMP REAR STAY 
    1. Torque: 39.2 N.m (400 kgf.cm, 29 ft.lbf) 
  13. REINSTALL ENGINE COVER 

    Reinstall the engine cover with the 4 nuts.

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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.