J2000/Sunbird V6-191 3.1L (1992)
A/C Signal: Description and Operation
A/C On Signal, Pressure Sensor And Clutch Control Relay
PURPOSE:
This signal indicates that the A/C control switch is turned "ON" and the pressure switch is closed.
OPERATION:
The ECM uses this signal to adjust the idle speed, and on some models engages the A/C compressor clutch. If this signal is not available to the
ECM, the engine idle may be rough when the A/C compressor cycles. In some cases the A/C compressor will be inoperative.
