High Pressure Sensor -G65-

High pressure sensor -G65-
Where applicable, high pressure sensor - G65- -B-, transmits a square wave signal to Coolant Fan Control (FC) Module -J293- at a rate which varies according to the refrigerant system pressure. -J293 reacts to the pulse rate of the signal from -G65 as follows:
- If the refrigerant system pressure rises, -J293- switches the radiator fan(s) to the second speed.
- Where excessive or insufficient refrigerant system pressure is present (E.g.: insufficient air flow over condenser or when overcharged), -J293- switches A/C clutch -N25- off (-N25- controlled by - J293-).
- On Climatronic equipped models it informs the A/C control head -E87- that the pressure in the refrigerant system is OK and that A/C clutch -N25- can be switched on (-N25- controlled by -J293-).

On applicable engines, the signal generated by -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.


NOTE:
- The presence of -G65- is engine dependant. Where -G65- is not used, A/C pressure switch -F129- is used instead.
- Where -G65- is used, it's wiring circuit varies according to engine application (E.g.: some are connected to the ECM, some are not).
- Always confirm system use of -G65- and applicable wiring circuit using applicable "Engine" and "Air conditioning" wiring diagrams.