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

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General System Description

Fig. 1 Bosch Motronic Electronic Engine Control System:






This system, Fig. 1, incorporates fuel injection and ignition system control functions into one electronic controller. This data collection center or ECU processes sensor input signals and calculates the optimum values for ignition advance, fuel injection and emissions control by use of programmed data and correction fields.