Sienna 1998-1999

Variable Valve Timing Sensor

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Location



Specific to:

Toyota Sienna 1998-2005



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Fig. VVT sensor location -3.3L engine

Operation



Specific to:

Toyota Sienna 1998-2005

The Variable Valve Timing (VVT) system includes the ECM, the Oil Control Valve (OCV) and the VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is based on engine operating conditions such as intake air volume, throttle position and engine coolant temperature.

Removal & Installation



Specific to:

Toyota Sienna 1998-2005

  1. Remove air cleaner.
  2.  
  3. Disconnect the 2 VVT sensor connectors.
  4.  
  5. Remove the 2 bolts and the 2 VVT sensors.
  6.  

To install:

  1. Installation is the reverse of removal.
  2.  
  3. Apply a light coat of engine oil to the O-ring on the VVT sensor.
  4.  
  5. Install the 2 VVT sensors with the 2 bolts and tighten to 71 inch lbs. (8 Nm).
  6.  

Testing



Connection & Wiring Diagnosis

Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following tests:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF. Using a suitable the scan tool, observe the component operation.
     
    With the engine running, move the related connectors and wiring while monitoring component operation.
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary.
     

  2.  
  3. Test the connector terminal pins and/or wiring by performing the following tests:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.
     
    Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
     

  4.  

 
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