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)

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Idle Air Control

IDLE AIR CONTROL




The ECM controls the electronic control throttle based on signals from the crankshaft position sensor, engine coolant temperature sensor, air flow sensor, manifold absolute pressure sensor and A/C switch so that the proper idle speed for each engine load is achieved.