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)

Or, hide this message: temporarily or permanently

Ignition Diagnostic Monitor (IDM)

Electronic Diagnostic Monitor (EDM)

The Electronic Diagnostic Monitor (EDM) is a function of the EDIS module. The EDIS module sends information on system failures to the EEC-IV, which stores the information for diagnostic self tests. The EDM signal is also used to drive the vehicle instrument tachometer and.or test tachometer for diagnosis.