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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Signal Usage

The Engine Speed Signal is connected to pin 67 of the Motronic control module, the signal is directional OUT only (PIN 67 - OUTPUT ONLY).

The engine speed signal is produced from information supplied to the Motronic control module by the engine speed sensor. This signal is used as engine speed information by the automatic transmission control module (TCM).

NOTE: This signal is simultaneously used by the tachometer for display of engine speed in rpm's.