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

Idle Up Control Valve: Description and Operation




Supplementary Air Valve
An additional throttle bypass device is used to supplement the air necessary to support the engine idle speed when the air conditioning system is in use. This device is a solenoid operated valve which supplies supplementary air to the engine