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A/C Signal|Testing and Inspection > < Engine Control Module - ECM
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A/C Signal: Description and Operation
Powertrain Control Module - PCM

A/C Circuit

PURPOSE:

This signal indicates that the A/C control switch is turned "ON" and the pressure switch is closed. The control module uses this signal to adjust the
idle speed.

A/C Signal|Testing and Inspection > < Engine Control Module - ECM