Operation CHARM
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Pontiac
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1993
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Lemans FWD L4-98 1.6L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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A/C Signal
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Description and Operation
A/C Signal: Description and Operation
This signal indicates that the A/C control switch is turned "ON" and the pressure switch is closed. The computer uses this signal to adjust the idle speed, and on some models engages the A/C compressor clutch.