Operation CHARM
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Mercury
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1994
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Cougar/XR7 V8-281 4.6L SOHC
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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
PURPOSE
The
Powertrain Control Module
(PCM)
monitors A/C clutch apply signal. The PCM uses this signal for adjustment of the Idle Air Control
(IAC)
valve to maintain the proper
idle speed
.