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

Scan Tool Testing and Procedures


The state display function enables the technician to view conditions as they exist at the signal level. When main menu is displayed, selecting state displays option (pressing enter when arrows are pointing to correct function) will change display to systems which are supported in the state display mode.
Selection of the Engine option (pressing enter when arrows are pointing to correct function) will change display to systems which are supported in the engine state display mode. This is the level to check individual sensors, relays, air & coolant temperatures, battery voltage & injector pulse width.