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
Circuit Description
Circuit OperationThe engine or
powertrain control module (ECM or
PCM) receives inputs from the engine sensors and switches, controlling the functions of the engine. The ECM or PCM also turns on the "CHECK ENGINE" malfunction indicator light whenever a malfunction or abnormal engine performance is detected, and allows for diagnostic testing through the data link connector (DLC).