Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
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General Information
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 consists of a separate
ignition coil connected to each
spark plug by a short secondary wire. The driver modules within each coil assembly are commanded ON/OFF by the Powertrain Control Module (
PCM). The PCM primarily uses engine speed and position information from the crankshaft and Camshaft Position (
CMP) sensors to control the sequence, dwell, and timing of the spark. The EI system consists of the following components: