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

Output Diagnostic Test Mode (DTM)

1989 Audi models with CIS-MOTRONIC engine control system do not have "output check" capability. Self diagnostic functions are limited to storing and displaying fault codes. Attempting to initiate output checks, as on other models, will simply re-start fault memory display.