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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Ignition System: Description and Operation

- Receives CKP signals from the CKP sensor and generates an internal target signal based upon engine speed, load, temperature, knock detection, and other sensor information.
- The target signal is used to command the firing of the coils. When the coils are fired a kickback voltage occurs and is used by the PCM to generate an IDM signal which is used to determine if an ignition failure mode should be recorded.