#
MANUAL AIR CONDITIONER CONTROL SYSTEM

id074000101000

## Block Diagram

• The function of A/C amplifier 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 (middle 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 A/C amplifier 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.