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Home >> Chevrolet >> 2002 >> Cavalier L4-2.2L VIN 4 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Engine Control Module >> Description and Operation >> Electronic Ignition (EI) System Description
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Electronic Ignition (EI) System Description

The PCM controls all ignition system functions, and constantly corrects the spark timing. The PCM monitors information from various sensor inputs that include the following:
^ The Powertrain Control Module (PCM)
^ The Throttle Position (TP) sensor
^ The Engine Coolant Temperature (ECT) sensor
^ The Mass Airflow (MAF) sensor
^ The Intake Air Temperature (IAT) sensor
^ The Vehicle Speed Sensor (VSS)
^ The transmission gear position or range information sensors
^ The engine Knock Sensors (KS)
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