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

Air System Enable Criteria




^ Traction control is not active
^ Battery voltage is between 11 and 18 volts
^ ECT is between 4 and 79°C (40 and 174°F)
^ TAT is greater than 0°C (32°F)
^ Engine speed is less than 3200 rpm
^ MAP is greater than 20 kPa
^ Calculated engine airflow is less than 30 g/s