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
If it fails: lemon-manuals.org.ua

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Desired Idle Speed

The scan tool range is 0-3187 RPM. The PCM commands the desired idle speed. The PCM compensates for various engine loads based on engine coolant temperature in order to keep the engine at the desired speed.