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

Malfunction Indicator Lamp: Description and Operation

PURPOSE/OPERATION
The check engine/malfunction indicator lamp provides a visual signal to the operator when a critical system is not working as it should. The check engine/malfunction indicator lamp can also be used by the technician to read the diagnostic trouble codes.