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

Inspection/Maintenance (I/M) Diagnostics

I/M ready status means a flag for each emission test has been set in the ECM. I/M ready status indicates that the vehicles on-board emissions diagnostics have been run. The status flag does not display passed or failed, only that the on-board diagnostic test was completed. The I/M ready status is used for tests that are not run continuously during a drive cycle but are only run once per trip.