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

System Testing










1. Disconnect the vacuum hose (red stripes) from the throttle body and connect it to a hand vacuum pump.
2. Plug the nipple from which the vacuum hose is disconnected.
3. Under the engine conditions shown below, check by applying vacuum from a hand vacuum pump.





When engine is cold-engine coolant temperature:
60°C (140°F) or less




When engine is hot-engine coolant temperature:
70°C (158°F) or higher