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 an individual coil for each cylinder. The ignition coils and the driver modules are contained within two assemblies, one for each cylinder bank. The assemblies are mounted in the center of each camshaft cover with short boots connecting coils to the spark plugs. The driver modules within each ignition coil are commanded ON/OFF by the engine control module (ECM). The ECM primarily uses engine speed and position information from the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor. This controls the sequence, dwell, and timing of the spark. The EI system consists of the components listed below.