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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Engine Control Module: Description and Operation

The ECU, located behind the passenger side instrument panel, converts sensor input data into digital signals to control output signals of the Motronic system. A fixed-value memory or ROM-IC is used to store the engines operational characteristics. An operating data memory or RAM stores delivered data until the processor requires the information or updates it.