Operation CHARM: Car repair manuals for everyone.
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 Operation

A Scan Tool can be connected to the Data Link Connector (DLC), this allows the Scan Tool to communicate with the Diesel Powertrain Control Module (PCM), Gasoline Vehicle Control Module (VCM), the Inflatable Restraint Control Module, or the Electronic Brake Control Module. System operations can then be monitored for diagnostic purposes.