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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EGR Control Solenoid: Description and Operation

The EGR solenoid is energized by the logic module when engine temperature is below 70° F. This closes the solenoid and prevents ported vacuum from reaching the EGR valve. When engine temperature exceeds 70° F, the solenoid is de-energized and ported vacuum from the throttle body will pass through to the EGR valve. At idle and wide open throttle the solenoid is energized, preventing EGR operation.