I have a 02 dakota 2wd an have been getting code p0442 or 441..- purge valve incorrect .. an tried changing oit the solonoid an replacing cannister an hoses an checked gas cap too.but still getting code .
Any ideas what to test?
How do you test these LDT pumps..?
Is there also a way to test the purge solonoid?​​​

 

I wouldn't focus on the LDT pump or the purge solenoid.

P0442 - EVAP monitor medium leak detected.

You likely do have a leak. It could be the gas cap, it could be the filler neck, or a line to the tank. The usual means to check is to smoke test the system.

 

I'm sorry I think it was p0441
I've cleared it ..but I remember --incorrect purge flow code

How do I test it an the leak detector?

 

First thing to do is check all the lines leading to and from the evap system components (and everywhere in between). That means check lines going to charcoal canister, purge valve and leak detection pump. Pull them off and squeeze the ends to see if there are any splits. If you find any, cut off an inch or so and reconnect.

 

Already have done that .

I'm gonna pu​t one from junkyard on an see if it changes anything..gonna try LDT part 1st..
Then solonoid.

-----Would really love to do a test on them if I can though..----
It is getting correct voltage also.
When I replaced old charcoal canister there were loose pellets in it but I used compressed air to clear lines..

 

Voltage to the purge solenoid won't help. It isn't just on/off, it cycles. The PCM controls how fast.

 

The pump and solenoid are shared among many Chrysler vehicles. I just swapped my LDP with one from a 2009 PT Cruiser in the junkyard. You can use ebay to look up parts and view all vehicles that they fit. PT Cruiser and dodge ram from a wide range of years, if I recall correctly.

 

I would double check the hoses again. I hd codes for a long time that i could never find, when i removed my battery tray and put the battery in the bed, magically I found a couple of broken hoses under the tray. replaced those and codes went away.