9-3 1999

Air Bypass Valve

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Location





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Fig. ABV sensor location-1999-2002 2.0L engine



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Fig. ABV sensor location-2003-2005 2.0L engine



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Fig. ABV sensor location-2.3L engine



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Fig. ABV sensor location-3.0L engine

Operation



The turbo pressure in the inlet manifold depends mainly on the engine speed and load. However, at higher loads, the turbo pressure is limited by the air bypass valve.

The air bypass valve is a flap valve that closes and opens a bypass duct in parallel with the turbine wheel. The flap valve is actuated by a rod connected to a diaphragm in a housing located near the compressor housing. There is a spring in the diaphragm housing that closes the flap valve.

The air bypass valve for the turbo pressure is closed at low and normal engine loads. As the load increases and the turbo pressure approaches its maximum value, the load that the spring exerts on the diaphragm is balanced and then exceeded and the air bypass valve opens the bypass duct. This causes the turbo rpm to drop and the pressure is reduced.

The air flow from the turbo compressor is controlled by a solenoid valve which controls the air bypass valve pneumatically. The engine control module (ECM) ensures that the current air mass/combustion complies with that requested and sends PWM signals to control the solenoid valve.

Removal & Installation



2.0L Engine
  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Disconnect the vacuum hose from the charge air bypass valve.
  4.  
  5. Remove the hose clamps and release the valve from the turbo pipes.

    Click image to see an enlarged view

    Fig. ABV sensor location

  6.  

To install:

  1. Installation is the reverse of removal.
  2.  

2.3L Engine
  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Disconnect the vacuum hose from the charge air bypass valve.
  4.  
  5. Remove the hose clamps and release the valve from the turbo pipes.

    Click image to see an enlarged view

    Fig. ABV sensor location

  6.  

To install:

  1. Installation is the reverse of removal.
  2.  

Testing



2.0L Engine
  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Disconnect the vacuum hose from the charge air bypass valve.
  4.  
  5. Connect the pressure/vacuum pump, 30 14 883 Pressure/vacuum pump, and build negative pressure in the valve.

    Click image to see an enlarged view

    Fig. Testing the ABV sensor

  6.  
  7. Check that the diaphragm is intact. If the diaphragm is damaged, no vacuum can be created.
  8.  
  9. Repeat the tests again pumping up the pressure.
  10.  
  11. Replace the valve as necessary.
  12.  

2.3L Engine
  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Disconnect the vacuum hose from the charge air bypass valve.
  4.  
  5. Connect the pressure/vacuum pump, 30 14 883 Pressure/vacuum pump, and build negative pressure in the valve.

    Click image to see an enlarged view

    Fig. Testing the ABV sensor

  6.  
  7. Check that the diaphragm is intact. If the diaphragm is damaged, no vacuum can be created.
  8.  
  9. Repeat the tests again pumping up the pressure.
  10.  
  11. Replace the valve as necessary.
  12.  

 
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