HIGH PRESSURE SENSOR, FUNCTION
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.
Scheme 149
- Contact 1: Ground (GND)
- Contact 2: Square wave signal (output) to Coolant Fan Control (FC) Module -J293- and Motronic Engine Control Module (ECM) -J220
- Contact 3: Terminal 15 (ignition on)
Note. A/C Clutch -N25- is switched off when connector -B- is disconnected