2006 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. DISCONNECT BATTERY NEGATIVE TERMINAL 
  4. REMOVE V-BANK COVER 
  5. REMOVE INTAKE AIR CONNECTOR PIPE 
  6. REMOVE THROTTLE BODY ASSY (See  REPLACEMENT   ) 
  7. REMOVE INTAKE MANIFOLD ASSY 
    Fig 1: Disconnecting VSV Connector For EVAP
    G02998075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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.
    7. Disconnect the VSV connector for IAC Valve.
      Fig 2: Disconnecting VSV Connector For IAC Valve
      G02998076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Remove the bolt and V-bank cover bracket No. 1.
    9. Remove the bolt and V-bank cover bracket No. 4.
    10. Remove the 4 bolts, and disconnect the engine wire protector (LH side) from upper intake manifold and camshaft bearing cap.
      Fig 3: Removing Bolts And Disconnecting Engine Wire Protector
      G02998077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 bypass joint and RH cylinder head.
    13. Disconnect the 8 injector connectors.
      Fig 4: Identifying Bolts
      G02998078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. Remove the 6 bolts, 4 nuts, the upper and lower intake manifolds assembly and 2 gaskets.
  8. REMOVE KNOCK SENSOR 
    Fig 5: Removing Knock Sensor
    G02998079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2 knock sensor connectors.
    2. Remove the 2 nuts and 2 knock sensors.
  9. INSTALL KNOCK SENSOR 
    Fig 6: Installing Knock Sensor
    G02998080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Install the 2 knock sensors with the 2 nuts, as shown in the illustration.
      1. Torque: 20 N.m (204 kgf.cm, 15 ft,lbf) 
    2. Connect the 2 knock sensor connectors.
  10. INSTALL INTAKE MANIFOLD ASSY 
    Fig 7: Installing Intake Manifold Assy
    G02998081Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Place 2 new gaskets on the cylinder heads with the white mark facing outward.
      NOTE: Be careful of the installation direction.
    2. Install the upper and lower intake manifolds assembly with the 6 bolts and 4 nuts.
      Fig 8: Installing Upper And Lower Intake Manifolds Assembly
      G02998082Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Torque: 18 N.m (185 kgf.cm, 13 ft.lbf) 
    3. Connect the 8 injector connectors.
    4. Install the engine wire protector (rear side) with the 2 bolts.
      Fig 9: Identifying Wire Clamps
      G02998083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Install the engine wire protector (LH side) with the 4 bolts.
    6. Install the 2 wire clamps on the engine wire (RH side) to the brackets on the RH delivery pipe.
    7. Install the V-bank cover bracket No. 4 with bolt.
      Fig 10: Connecting VSV Connector For IAC Valve
      G02998084Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Torque: 7.5 N.m (76.5 kgf.cm, 66 in..lbf) 
    8. Install the V-bank cover bracket No. 1 with bolt.
      1. Torque: 7.5 N.m (76.5 kgf.cm, 66 in..lbf) 
    9. Connect the VSV connector for IAC Valve.
    10. Install the V-bank cover bracket No. 3 with bolt.
      Fig 11: Connecting VSV Connector For EVAP
      G02998085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Torque: 7.5 N.m (76.5 kgf.cm, 66 in..lbf) 
    11. Install the V-bank cover bracket No. 2 with bolt.
      1. Torque: 7.5 N.m (76.5 kgf.cm, 66 in..lbf) 
    12. Install the VSV for EVAP to the intake manifold with the bolt.
      1. Torque: 7.5 N.m (76.5 kgf.cm, 66 in..lbf) 
    13. Connect the EVAP hose to the VSV for EVAP.
    14. Connect the VSV connector for EVAP.
  11. INSTALL THROTTLE BODY ASSY (See  REPLACEMENT   ) 
  12. INSTALL INTAKE AIR CONNECTOR PIPE 
  13. INSPECT FUEL PUMP OPERATION AND CHECK FOR FUEL LEAKS (See  ON-VEHICLE INSPECTION  ) 
  14. INSTALL V-BANK COVER 
    1. Torque: 5.0 N.m (51 kgf.cm, 44 in..lbf) 
  15. CONNECT BATTERY NEGATIVE TERMINAL 
    NOTE: When disconnecting the negative (-) battery terminal, initialize the following systems(s) after the terminal is reconnected (see INITIALIZATION ).
  16. REFILL ENGINE COOLANT (See  ENGINE COOLANT  ) 
  17. CHECK FOR ENGINE COOLANT LEAKS (See  ON-VEHICLE INSPECTION  ) 
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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