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CPC Valve Duty Ratio (%)
Posted:
Fri Jan 06, 2006 6:55 pmby west_minist
Anyone know what this is?
Re: CPC Valve Duty Ratio (%)
Posted:
Sat Jan 07, 2006 1:01 amby crispyduck
west_minist wrote:Anyone know what this is?
It is the
Canister Purge Control (CPC) solenoid valve duty ratio.
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.
Information source: Project Transam
In summary, it appears this is part of the emmision control system thus not an interesting parameter to be tuning - no performance gain!
-Steve.
Posted:
Sat Jan 07, 2006 7:25 amby west_minist
All sounds wonderful, but how does nit affect the engine?
Can it be fault?
Posted:
Sun Jul 15, 2007 5:02 amby haha
My ECU is throwing a code for this
P0485 or P0458 - I forget which one
but my rom doesnt allow me to "disable" it
how do I go about solving this ?
Help !
Posted:
Sun Jul 15, 2007 8:44 amby Freon
It won't hurt anything if it doesn't work right. It is just evaporative emissions stuff.
west: Not sure how to explain how it does not affect engine operation. I don't think the burden of proof is to explain how something does not affect engine operation.
crispy: why can't you disable it? And you really need to know exactly which code you're getting.
Posted:
Sun Jul 15, 2007 12:49 pmby crispyduck
I think Freon means 'haha'
Posted:
Wed Aug 15, 2007 6:38 pmby west_minist
Freon wrote:It won't hurt anything if it doesn't work right. It is just evaporative emissions stuff.
west: Not sure how to explain how it does not affect engine operation. I don't think the burden of proof is to explain how something does not affect engine operation.
crispy: why can't you disable it? And you really need to know exactly which code you're getting.
Thanks Freon and everyone.
Posted:
Sun Nov 11, 2007 7:19 amby thejean
Is it normal for a cpc valve duty ratio to ossicllate if te AFRs are oscillating?
Posted:
Sun Nov 11, 2007 8:17 amby Freon
I don't think the two are necessarily connected.
Posted:
Sun Nov 11, 2007 4:01 pmby Dougnutz
I'm pretty sure Freon is right about them not being related.
Most cars cycle the cpc during cruise conditions and it normally oscillates when it is on.