High Pressure Sensor G65

High Pressure Sensor G65






Where applicable, High Pressure Sensor G65 transmits a square wave signal to Coolant Fan Control (FC) Control 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), Coolant Fan Control (FC) Control Module J293 switches the A/C Clutch N25.
- On Climatronic equipped models it informs the A/C Display Control Head E87 that the pressure in the refrigerant system is OK and that A/C Clutch N25 can be switched on via 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, its 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.