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 Check Valve: Description and Operation
OPERATION Solenoid--energized by the ECM during cold engine operation--blocks ported vacuum to the
EGR valve.
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When engine temperature is at or above the value programmed into the ECM, the module de-energizes the
solenoid, which then directs ported vacuum to the
EGR valve, activating the EGR system.