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

Emission Control Systems


EGR valve vacuum signal less than 250 mmHg (10 inHg)
Canister purge TVS coolant temperature opening 46~C (115~F)
THERMAC temperature sensor:
Below 30~C (86~F) damper door closed to outside air
Above 55~C (131~F) damper door open to outside air
THERMAC vacuum motor 175 mmHg (7 inHg)