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/Throttle Speed Control Unit: Adjustments

Tachometer Connections:




Adjusting Idle Speed:






1. Run engine until operating temperature is reached.
2. Turn all accessories "OFF."
3. Connect a tachometer to the IG terminal in the diagnostic connector.
4. Adjust idle speed by turning the adjusting screw. Refer to SPECIFICATIONS for proper value.