Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM (1NZ-FE)KNOCK SENSORREMOVAL

2009 Toyota Yaris S, 4D Hatchback

Knock Sensor: Removal

2009 Toyota Yaris S, 4D HatchbackSECTION Removal

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
DRAIN ENGINE COOLANT (See REPLACEMENT )
REMOVE CYLINDER HEAD COVER NO. 2 (See REMOVAL )
REMOVE AIR CLEANER CAP SUB-ASSEMBLY WITH AIR CLEANER HOSE NO. 1 (See REMOVAL )
DISCONNECT WATER BY-PASS HOSE (See REMOVAL )
DISCONNECT WATER BY-PASS HOSE NO. 2 (See REMOVAL )
REMOVE THROTTLE WITH MOTOR BODY ASSEMBLY (See REMOVAL )
REMOVE INTAKE MANIFOLD
1. Separate the engine wire harness from the intake manifold.
  
  Fig 1: Identifying Engine Wire Harness And Intake Manifold
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Separate water by-pass hose No. 2.
  
  Fig 2: Identifying Water By-Pass Hose No. 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the ventilation hose.
  
  Fig 3: Locating Ventilation Hose
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Disconnect the union to connector tube hose.
  
  Fig 4: Locating Connector Tube Hose
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Remove the 3 bolts and 2 nuts and remove the intake manifold.
6. Remove the gasket from the intake manifold.
  
  Fig 5: Locating Intake Manifold, Bolt And Nut
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE KNOCK SENSOR
1. Disconnect the knock sensor connector.
2. Remove the nut and remove the knock sensor.
  
  Fig 6: Locating Knock Sensor Connector And Nut
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RENDER: 1.0x

NO RELATED

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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.