Air Conditioning Operation

The A/C control assembly receives various signals, I.E., the engine RPM from the engine control module, out side air temperature signal from the ambient temp. sensor and coolant temperature from the engine control module, etc. When the engine is started and the A/C SW (A/C control assembly) is on, a signal is sent to the engine control module.

As a result, the ground circuit in the engine control module is closed and current flows from the ECU-IG fuse to TERMINAL 1 of the MG/C relay then out TERMINAL 2 to TERMINAL MGC of the engine control module, turning the MG/C relay on, so that the magnetic clutch turns on. At the same time, the A/C control assembly detects that the magnetic clutch is on and the A/C compressor operates.

If the A/C control assembly detects any of the following conditions, it stops the air conditioner:

* Evaporator outlet air is too low.

* There is a marked difference between the compressor speed and the engine speed.

* The refrigerant pressure is abnormally high or abnormally low.

* The engine speed is too low.

* Rapid acceleration occurs.