CPC Valve Duty Ratio (%) Subaru

Description

Canister Purge Control (CPC) solenoid valve duty ratio

Usage Notes

The charcoal carbon canister is part of the vehicle's Evaporative Emission Control System and is purged by a vacuum operated purge valve. The ECM controls vacuum to this valve through the Canister Purge Solenoid. This data field displays the percentage of time the canister is being purged over a predetermined time interval. On most vehicles the purge solenoid is energized to inhibit purging and de-energized to permit purging of the charcoal canister. This solenoid is energized during a cold engine condition and is de-energized after warm-up when the engine is above a specified RPM. Canister purge allows collected fuel vapors in the canister to be drawn into the intake manifold for burning. Canister purge on some vehicles is controlled through a combined EFE/EGR/Canister Purge solenoid unit.

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