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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Adaptive Memory Control


When in closed loop operation, the ECU monitors output voltage signal from exhaust oxygen sensor and stores in a Random Access Memory (RAM) the mean values of feedback gain. The last mean values are always stored.
When in open loop operation, the fixed pre-set fuel delivery time is modified by the ECU with the mean values of feedback gain to improve emission performance.