Electronic Ignition (EI) System Description: Notes

The electronic ignition (EI) system produces and controls a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time. This provides optimal performance, fuel economy, and control of exhaust emissions. This ignition system uses a ignition control module (ICM) for each bank. The ICMs consist of a controller and ignition coils. The ICMs are mounted in the center of each camshaft cover, with short boots connecting the coils to the spark plugs. The engine control module (ECM) primarily uses engine speed and position information from the crankshaft (CKP) and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark.