Boost (BARO) Sensor

Boost (BARO) Sensor:

The boost sensor measures the changes in the intake manifold pressure. The boost sensor converts the pressure into voltage output.

The PCM sends a 5 Volt reference signal to the boost sensor. As the manifold pressure changes, the electrical resistance of the boost sensor also changes. By monitoring the sensor output voltage, the PCM detects the boost pressure. A high pressure (high voltage) requires more fuel. A lower pressure (low voltage) requires less fuel. The control module uses the boost pressure signal in order to control the fuel delivery.

The boost sensor is also used for BARO readings on vehicles that are not equipped with an EGR. The sensor reads the Barometric Pressure (BARO) under certain conditions, allowing the PCM to automatically adjust for different altitudes.