Boost Pressure Sensor (After Supercharger)
The boost pressure sensor measures the air pressure in the intake, after the compressor ahead of the turbo. The information is used to regulate compressor and turbo control, as well as to control other air pressure sensors in certain positions.
The sensor, which is an Piezo resistive resistor, is grounded in the control module and supplied with power (5 V) from the control module.
Depending on the pressure, the silicone membrane in the sensor moves which changes the resistance, and thus varies the voltage level of the analogue signal to the control module.
For information about electrical connection, see wiring diagram. For sensor characteristics and normal values, see signal specification and component specification.
The pressure sensor can be diagnosed by the Engine Control Module (ECM) and the sensor signal can be read off.