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)

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Alternator Field Sense

The engine controller constantly monitors the alternator field output (alternator output). The signal that the engine controller receives is an indication of what voltage levels are being supplied to the injectors and the ignition coil. The engine controller adjusts the alternator field and injector pulse width based upon the alternator field sense input.