Touareg V10-5.0L DSL Turbo (BKW) (2004)
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High Pressure Sensor / Switch: Description and Operation
High Pressure Sensor -G65-
The signal generated by -G65- is provided as an input to the Climatronic Control Module -J255- and Motronic Engine Control Module (ECM) -J220-.
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.
High pressure sensor -G65- -B-, transmits a square wave signal to -J255- and -J220- at a rate which varies according to the refrigerant system pressure.
-J255- reacts to the pulse rate of the signal from -G65 as follows:
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If the refrigerant system pressure rises, -J255- provides an appropriate signal to the Engine Control Module (ECM) -J220- via the Powertrain CAN
Bus for radiator fan(s) speed control (radiator fan speed increases).
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Where excessive or insufficient refrigerant system pressure is present (E.g.: insufficient air flow over condenser or when overcharged), compressor
output is regulated via -J255- control of A/C Compressor Regulator Valve -N280- (no or very little load is applied).
