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

Main Relay (Computer/Fuel System): Description and Operation

MFI CONTROL RELAY
When the ignition switch is on, battery power is supplied to the ECM, the injectors, the mass air flow sensor, etc. While the ignition switch is turned on, current flows from the ignition switch through the current relay coil to ground.