Shadow Convertible L4-135 2.2L SOHC VIN D FI (1992)
A/C Signal: Description and Operation
Purpose
The Control Module monitors engine load and A/C system pressure, and cycles the A/C compressor clutch accordingly.
Operation
When the A/C or defrost switch is ON, and the A/C high and low pressure switches are closed, the PCM receives an "A/C SELECTED SIGNAL".
^ PCM engages A/C compressor clutch (by grounding clutch relay).
^ PCM cycles compressor clutch depending on engine load and A/C system pressure.
^ PCM maintains correct engine idle speed, through the Idle Air Control (IAC) Motor.
