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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Transmission Control Systems: Description and Operation

The transmission control module (TCM) receives inputs from switches. sensors and the electronic control module (ECM) and controls the functions of mode the transaxle. The transmission control module (TCM) also controls the manual and economy indicator lights and allows for diagnostic testing through the transmission control module (TCM) diagnostic connector.