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

Engine Control Module: Description and Operation

The electronic control unit is designed to constantly adjust the air/fuel mixture based on the signal from the oxygen sensor. The ECU does this by sending a signal to the frequency valve, which alters the control pressure at the fuel distributor.