MANUAL AIR CONDITIONER CONTROL SYSTEM

id074000101000

Block Diagram

• The function of center panel has been included into the PCM.

• The evaporator temperature sensor sends a evaporator temperature signal to the PCM.

• The A/C switch and fan switch send an A/C signal to the PCM via the refrigerant pressure switch (HI and LO pressure).

• The refrigerant pressure switch (medium pressure) sends an idle-up signal to PCM.

• When the PCM receives those signals, it sends operating signals to the A/C relay and IAC valve based on A/C cut control and idle air control.

Outline of Control System

• Manual air conditioner defroster control and A/C compressor control.


Control name	Control part
A/C compressor control	Center panel

A/C Compressor Control

• The function of the center panel has been included into the PCM.

• When the PCM receives those signals, it sends operating signals to the A/C relay and IAC valve based on A/C cut control and idle air control.

A/C signal on/off control

• The PCM turns the A/C signal (magnetic clutch) on and off based on the temperature of the air passing through the evaporator when the A/C and fan switches are on. This keeps the evaporator surface temperature within the specified range, preventing the evaporator from freezing while the fan switch and A/C switch are turned on.