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)
Or, hide this message:
temporarily or
permanently
Engine Control Module: Description and Operation
ECMThe ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine.
ECM POWER SUPPLYBattery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory the air-fuel ratio feedback compensation value memory the idle air volume learning value memory etc.
