System Outline

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

As a result, current flows from the HTR fuse to TERMINAL 2 of the MG CLT relay and out TERMINAL 1 to TERMINAL MGC of the integration control and panel to GROUND, turning the MG CLT relay on, so that the magnetic clutch comes on and the A/C compressor operates.

If the integration control and panel detects the following conditions, it stops the air conditioning:

* The 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.