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

Calculated IAC Air Flow

The calculated IAC air flow is the volume of air the PCM determines is necessary to maintain the desired Air/Fuel mixture of 14.7 to 1. The PCM is using information from the TP sensor, the MAF sensor flow, and the Engine Speed in order to calculate the desired IAC air flow. The scan tool displays the volume of air in Liters per minute (L/Min) or Cubic Feet per minute (FT3/Min).