Daytona IROC R/T L4-135 2213cc 2.2L DOHC Turbo VIN A FI (1993)
A/C Signal: Description and Operation
PURPOSE
Powertrain Control Module (PCM) 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.
