Sable V6-3.0L VIN U (1999)
Engine Control Module: Description and Operation
Powertrain Control Module (PCM)
The Powertrain Control Module (PCM) performs the following functions:
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The PCM accepts input from various engine sensors to compute the required fuel flow rate necessary to maintain a prescribed air/fuel ratio
throughout the entire engine operational range.
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Then the PCM outputs a command to the fuel injectors to meter the appropriate quantity of fuel.
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The PCM determines and compensates for the age of the vehicle and its uniqueness, also automatically senses and compensates for changes in
altitude (i.e. from sea level to mountains).