Air Conditioning sonsor

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Air Conditioning (A/C) Pressure Sensor

The A/C pressure sensor is installed on the high-pressure side of the A/C (air conditioning). The A/C pressure sensor sends a continuous analogue signal to the PCM, which describes the pressure status in the A/C high pressure line. More accurate fan control is possible thanks to this linear signal profile. The input voltage is 5V, the output voltage is between 0.5V and 4.5V depending on the cryogenic fluid pressure. When the cryogenic fluid pressure is low, the output voltage is also low.
The signal is also used to turn the A/C compressor on or off via the A/C clutch relay at certain pressure values.


Air conditioning clutch relay

The A/C clutch relay is located in the BJB at slot R3.
The A/C clutch relay switches the A/C compressor on and off. It is actuated by the PCM. The driver's wishes are communicated to the PCM from the climate control operating panel via the CAN databus.
If a fault occurs due to the pressure conditions in the A/C circuit, the A/C compressor is turned off via the A/C clutch relay. The PCM also turns off the A/C clutch relay for a short time under certain conditions (high engine load, when accelerating, high coolant temperature).
 

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