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Turbocharger/Supercharger Boost Control (B) Circuit

The turbocharger has nozzle vane which opens and closes to control the volume of the exhaust gas flowing into the turbine. This, in turn, controls the boost pressure, when the nozzle vane moves towards the closing direction, the pressure increases. When the vane moves towards the opening direction, the pressure decreases.

Faulty boost pressure/ turbocharger position sensor
Boost pressure/ turbocharger position sensor harness is open or shorted
Boost pressure/ turbocharger position sensor circuit poor electrical connection
Faulty turbocharger/supercharger

Check engine light

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