High Pressure Sensor, Function

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Where equipped, the High Pressure Sensor -G65- transmits a square wave signal to Coolant Fan Control (FC) Module -J293- at a rate which varies according to the refrigerant system pressure.

The signal from High Pressure Sensor -G65- is processed as follows:

Based on the pulse rate transmitted by the High Pressure Sensor -G65-, the Coolant Fan Control (FC) Module -J293- determines the A/C refrigerant system pressure and controls the function of the A/C Clutch -N25- and Coolant Fans accordingly. For example:

Switches the Coolant Fan -V7- to the next higher speed when pressure in the refrigerant circuit increases.
Switches off A/C Clutch -N25- when pressure is excessive (for example when engine cooling is insufficient).
Switches off A/C Clutch -N25- off when pressure is too low (for example with low/no refrigerant).

The signal generated by High Pressure Sensor -G65- is also provided as an input to the Motronic Engine Control Module (ECM). As the amount of torque needed to drive the A/C compressor varies according to the refrigerant system pressure, the ECM processes this signal in order to enhance engine performance.