Turbo Boost Sensor: Description and Operation

Boost Pressure Sensor:

The boost pressure sensor is mounted to the charge air pipe. The sensor allows the ECM to monitor intake air down stream of the turbocharger.

When the intake manifold pressure is low (high vacuum) sensor voltage output is 0.25-1.8 volts at the ECM. When the intake manifold pressure is high due to turbo boost, sensor voltage output is 2.0-4.7 volts. The sensor receives a 5-volts reference from the ECM. Sensor ground is also provides by the ECM. The ECM uses boost pressure combined with intake air temperature to determine the volume of air entering the engine.