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Mercury Truck
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1999
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Mountaineer 2WD V6-4.0L VIN E
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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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Malfunction Indicator Lamp
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Description and Operation
Malfunction Indicator Lamp: Description and Operation
The CHECK ENGINE/Malfunction Indicator Lamp
(
MIL
)
is illuminated when a Diagnostic Trouble Code
(DTC)
or malfunction is sensed in the closed loop by the Powertrain Control Module
(PCM)
.