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Home >> Saturn >> 2007 >> Ion Red Line >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Controls (Introduction)) >> Description and Operation >> Electronic Ignition (EI) System Description >> Electronic Ignition (EI) System Operation

Electronic Ignition (EI) System Operation

WARNING: This page is about a different car, the 2004 Saturn Ion Red Line. However, it is still accessible from the selected car via links, so may be relevant.

The electronic ignition (EI) system produces and controls the high energy secondary spark. This spark ignites the compressed air/fuel mixture at precisely the correct time, providing optimal performance, fuel economy, and control of exhaust emissions. The powertrain control module (PCM) primarily collects information from the crankshaft position (CKP) and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark.

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