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

IAC Valve Opening






The IAC VALVE OPENING can be varied from 0% (closed) to 100% (wide open) by pressing number keys, 3 through 8, to set the desired value. Engine rpm, Mass Air Flow (MAF) sensor voltage, and Engine Coolant Temperature (ECT) sensor temperature are displayed. When this test is completed, press CANCEL to return to the ACTIVE COMMAND MODES menu (Screen Display J).