Brake Vacuum Sensor
The sensor is a linear pressure sensor of analogue type and measures the vacuum pressure in the brake booster. Engine Control Module (ECM) monitors the signal from the sensor by reading in the voltage level from the sensor's output signal and converting it to a corresponding pressure. The brake vacuum sensor is supplied with voltage 5 V and is grounded in the Engine Control Module (ECM).
If Engine Control Module (ECM) registers a too low vacuum pressure during driving, activation of the function for automatic start/stop of engine will not be permitted (blocked autostop). If Engine Control Module (ECM) registers a too low vacuum pressure during the time that the function for automatic start/stop of engine is active (vehicle in autostop), then the function is cancelled and the engine is started automatically (system-requested autostart).
The brake vacuum sensor is located on the brake booster.
The Engine Control Module (ECM) can diagnose the brake vacuum sensor.