Question about 2000 Subaru Legacy

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HAVE A 2000 LEGACY 250T. SOMETIMES VDC OFF LIGHT AND CHECK ENGINE COMES ON WHEN FIRST STARTED

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VDC is Vehicle Dynamics Control VDC is composed of 2 main systems: VTD plus VDC full time 4 wheel traction and engine management. VDC is traction control that senses vehicle direction and uses brake, throttle and engine management to help maintain stability. The components of the VDC system are: all wheel drive using the VTD system. When the wheels are spinning without traction or the vehicle is not going in the direction it is being steered, the VDC system kicks in. Direction: uses brakes to slow down wheels to reduce spin and help control vehicle direction. Skidding: yaw and steering wheel sensors use brakes to slow down spinning wheels and re-direct power to the wheel(s) with the best traction to re-gain control. Engine power use engine output to slow spinning by reducing spark to cylinders to cut back power and help re-gain control.


You may have a problem with the traction circuit itself or a sensor. I would have a diagnostic test done to verify if it is faulty and needs to be replaced. Do check tranny and transfer case fluids and filter and check any wiring to the system to make sure it is not brittle or broken

Posted on May 13, 2010

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