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

Non-Turbo


The Inlet Air Temperature Switch provides the ECM with a signal related to the temperature of air entering the engine. The signal prevents the ECM from setting trouble code 44 (lean oxygen sensor indication) when the temperature is 0°C (32°F) or below. It is an "ON/OFF" bimetal switch that has continuity at the specified temperature.