Electronic Ignition (EI) System Description: Notes

The electronic ignition (EI) system is responsible for producing and controlling 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 per cylinder. The ignition coils are mounted above each cylinder on the rocker cover with short integrated boots connecting the 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 information from the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor to control sequence, dwell, and timing of the spark. The EI system consists of the following components: