Operation CHARM
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Ford
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2009
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Focus L4-2.0L
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Cooling System
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Engine - Coolant Temperature Sensor/Switch
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Engine Temperature Sensor
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Description and Operation
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Electronic Engine Controls
Electronic Engine Controls
Electronic Engine Controls
The CHT sensor:
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sends the PCM a signal indicating cylinder head temperature.
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resistance decreases as coolant temperature increases.