Manifold Pressure/Vacuum Sensor: Description and Operation

GF07.04-P-6062MCC Component Description For The Intake Manifold Pressure Sensor


Shown on engine 132.910







B28 Intake manifold pressure sensor

Location
The intake manifold pressure sensor is located on the intake manifold.

Task
The intake manifold pressure sensor detects the pressure and the air temperature in the intake manifold downstream of the throttle valve and passes this information on in the form of voltage signals to the ME-SFI [ME] control unit (N3/10).

Function pressure measurement
The pressure applied to the pressure gauge connection distorts a membrane which acts on a piezoresistor. In this way the piezoresistor changes its resistance value and transmits an appropriate voltage signal to the ME-SFI [ME] control unit.

Function temperature measurement
There is an additional NTC resistor integrated in the intake manifold pressure sensor. This alters its electrical Resistor according to the air temperature in the intake manifold. The ME control unit applies a sensor voltage and evaluates the air temperature in accordance with the signal voltage.