2006 Toyota PriusFACTORY OEM SERVICE PROCEDURE

Knock Sensor: Removal

  1. 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.
  2. REMOVE RADIATOR SUPPORT OPENING COVER (See  REMOVAL   ) 
  3. REMOVE ENGINE UNDER COVER LH 
  4. DRAIN ENGINE COOLANT (See  COOLANT  ) 
  5. REMOVE AIR CLEANER ASSEMBLY (See  REMOVAL   ) 
  6. REMOVE OIL DIPSTICK GUIDE 
    1. Remove the dipstick.
    2. Disconnect the wire harness clamp.
    3. Remove the bolt and dipstick guide.
      Fig 1: Removing Bolt And Dipstick Guide
      G04472333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE INTAKE MANIFOLD SUB-ASSEMBLY 
    1. Disconnect the ventilation hose from the throttle with motor body.
    2. Disconnect the No. 2 ventilation hose.
    3. Disconnect the No. 1 fuel vapor feed hose.
      Fig 2: Disconnecting No. 1 Fuel Vapor Feed Hose
      G04472334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the water by-pass hose.
    5. Disconnect the No. 2 water by-pass hose.
      Fig 3: Disconnecting Water By-Pass Hose
      G04472335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Disconnect the throttle control motor connector.
    7. Disconnect the throttle position sensor connector.
      Fig 4: Disconnecting Throttle Position Sensor Connector
      G04472336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Disconnect the 3 wire harness clamps.
    9. Disconnect the connector clamp.
    10. Remove the bolt and harness clamp bracket.
      Fig 5: Disconnecting Connector Clamp
      G04472337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. Remove the No. 1 fuel vapor feed hose from the hose clamp.
    12. Remove the 3 bolts, 2 nuts and intake manifold.
      Fig 6: Removing Fuel Vapor Feed Hose From The Hose Clamp
      G04472338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. Remove the gasket from the cylinder head.
      Fig 7: Removing Gasket From Cylinder Head
      G04472339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE KNOCK SENSOR 
    1. Disconnect the knock sensor connector.
    2. Remove the nut and sensor.
      Fig 8: Removing Knock Sensor Connector
      G04472340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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