Operation CHARM: Car repair manuals for everyone.
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 Timing Control

DESCRIPTION
On the basis of the engine speed and load signals, the Digital Motor Electronic (DME) control unit determines the ignition angle (ignition timing) which is output via the ignition output stage. This function also takes into consideration other input signals such as the engine temperature, intake air temperature, throttle position and signals from the Electronic Throttle Control (EML), Automatic Stability Control (ASC), Engine Drag Torque control (MSR) and from the Electronic Transmission Control (EGS).