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:
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lemon-manuals.org.ua
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Vacuum Switch: Description and Operation
Vacuum Switch System:
The
Vacuum Switch is a contact type switch that is operated by intake manifold vacuum. When the throttle valve closes, the intake manifold vacuum acts on the vacuum switch to close its contact. By this action, the voltage on the ECU side is grounded and the ECU senses that the throttle valve opening is near idle.
