• BAP
• MAP
• EBP
• EFP
• EOP
Variable capacitance sensors measure pressure. The pressure measured is applied to a ceramic material.
The pressure forces the ceramic material closer to a thin metal disk. This action changes the capacitance of the sensor.
The sensor is connected to the ECM by three wires:
• VREF
• Signal return
• Signal ground
The sensor receives the VREF and returns an analog signal voltage to the ECM. The ECM compares the
voltage with pre-programmed values to determine pressure.
The operational range of a variable capacitance sensor is linked to the thickness of the ceramic disk.
The thicker the ceramic disk the more pressure the sensor can measure.
