Supercharger Control Valve, Bypass
The task of the supercharger control valve is to use a PWM signal (12V) from the Engine Control Module (ECM), to regulate the proportion of air that is routed into the supercharger. This is done using an electronically controlled throttle disc.
The unit consists of a round throttle disc on a spindle. The spindle is driven by a DC motor (supercharger control motor) and gear wheel.
By changing the polarity of the power supply, the DC motor can be run in both directions. At one limit position all air is routed in through the supercharger, at the other all air is routed past the supercharger.
The throttle disc's shaft is mechanically connected to a position sensor (potentiometer). The position sensor is supplied with power (5V) from the Engine Control Module (ECM) and provides information about the throttle disc's position to the control module in the form of an analogue signal.
For information about electrical connection, see wiring diagram. For sensor characteristics and normal values, see signal specification and component specification.
The supercharger control valve is located on the engine's intake pipe between the mass air flow sensor and the supercharger. In the event of a fault, the supercharger control valve must be replaced as a single unit.
The supercharger control can be diagnosed by the Engine Control Module (ECM) and signals for engine and position sensors can be read out.