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 logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

Fuel Trim Cell

Range 0 - 22 Cell.
22 separate cells contain MAP and RPM values from a range of engine operating conditions. Each cell determines fuel requirements for a specific operating condition that the engine is running within. Examples would be idling, accelerations, road load cruise, or decelerations.