Operation CHARM
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Pontiac
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1999
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Grand Prix V6-3.8L VIN K
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Repair and Diagnosis
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Powertrain Management
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Relays and Modules - Powertrain Management
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Relays and Modules - Computers and Control Systems
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Engine Control Module
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Description and Operation
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PCM Controlled Warning Lamps
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Hot Lamp
Hot Lamp
The
PCM
commands the Hot lamp ON when the engine coolant temperature exceeds
124°C (255°F)
. The PCM commands the Hot lamp OFF when the engine coolant temperature falls below
121°C (248°F)
.