2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Knock Sensor: Replacement

  1. DRAIN ENGINE COOLANT (See  ENGINE COOLANT  ) 
  2. WORK FOR PREVENTING GASOLINE FROM SPILLING OUT (See  PRECAUTION  ) 
  3. REMOVE V-BANK COVER 
  4. REMOVE INTAKE AIR CONNECTOR PIPE 
  5. REMOVE THROTTLE BODY ASSY (See  REPLACEMENT  ) 
  6. REMOVE INTAKE MANIFOLD ASSY 
    1. Disconnect the fuel pipe sub-assy No. 2 from the fuel main tube (See PRECAUTION ).
    2. Disconnect the VSV connector for EVAP.
    3. Disconnect the EVAP hose from the VSV for EVAP.
    4. Remove the bolt, disconnect the VSV for EVAP from the upper intake manifold.
    5. Remove the bolt and V-bank cover bracket No. 2.
    6. Remove the bolt and V-bank cover bracket No. 3.
      Fig 1: Removing Intake Manifold Assy Components (1 Of 3)
      G01049394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Disconnect the VSV connector for IAC Valve.
    8. Remove the bolt and V-bank cover bracket No. 1.
    9. Remove the bolt and V-bank cover bracket No. 4.
      Fig 2: Removing Intake Manifold Assy Components (2 Of 3)
      G01049395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Remove the 4 bolts, and disconnect the engine wire protector (LH side) from upper intake manifold and camshaft bearing cap.
    11. Disconnect the 2 wire clamps on the engine wire (RH side) from the brackets on the RH delivery pipe.
    12. Remove the 2 bolts, and disconnect the engine wire protector (rear side) from the rear water by-pass joint and RH cylinder head.
      Fig 3: Removing Intake Manifold Assy Components (3 Of 3)
      G01049396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. Disconnect the 8 injector connectors.
    14. Remove the 6 bolts, 4 nuts, the upper and lower intake manifolds assembly and 2 gaskets.
      Fig 4: Removing Upper And Lower Intake Manifolds Assembly Bolts And Nuts
      G01049397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE KNOCK SENSOR 
    1. Disconnect the 2 knock sensor connectors.
    2. Remove the 2 nuts and 2 knock sensors.
      Fig 5: Removing Knock Sensor
      G01049398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSTALL KNOCK SENSOR 
    1. Install the 2 knock sensors with the 2 nuts, as shown in the illustration.

      Torque: 20 N.m (204 kgf.cm, 15 ft.lbf) 

    2. Connect the 2 knock sensor connectors.
      Fig 6: Installing Knock Sensor
      G01049399Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSTALL INTAKE MANIFOLD ASSY 
    1. Place 2 new gaskets on the cylinder heads with the white mark facing outward.
      NOTE: Be careful of the installation direction.
Factory Service Tools

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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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