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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Throttle Full Close Switch: Description and Operation

The idle switch signals the ECU when the throttle is closed, indicating a deceleration or idle condition (the ECU decides which condition is present by comparing the idle switch indication with the engine speed). This is a normally open spring loaded switch. The throttle lever closes the switch when in the idle position.