Passat Sedan 4Motion W8-4.0L (BDP) (2002)
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High Pressure Sensor / Switch: Description and Operation
High Pressure Sensor -G65-
High Pressure Sensor -G65-
Where applicable, high pressure sensor -G65- -B- is used instead of A/C pressure switch -F129- -G65- transmits a square wave signal to the Climatronic
control module -J255- at a rate which varies according to the refrigerant system pressure. - J255- processes the signal/pulse rate from -G65- as follows:
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Confirms refrigerant system pressure is sufficient for A/C compressor regulator valve -N280- to be energized, and that compressor output
regulation via -N280- can begin.
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Where excessive or insufficient refrigerant system pressure is present (E.g.: insufficient air flow over condenser or when overcharged), A/C
compressor regulator valve -N280- will idle compressor internally.
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When the refrigerant system pressure rises, the radiator fan(s) are switched to the second speed.
Where applicable, the signal generated by -G65- may also be 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.
NOTE: Always confirm system use of-G65- described above by referring to model specific Training (SSP) information, and confirm applicable
wiring circuit using applicable "Engine" and "Climatronic" wiring diagrams.
