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 logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

Start Up IAT

The scan tool displays -40 to +151°C, -40 to +304°F. This indicates the IAT at the time that the vehicle was started. The IAT is used by the HO2S diagnostic to determine if the last startup was a cold start.