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flyboy 10-22-2011 05:43 PM

EVAP code P0443
:confused: 2001 WJ larado with 4.0L. Hi, can anyone help me with a little trouble shooting on this. the purge solenoid does not work unles I run power directly to it. My tech seems to think that there might be an open in the circut to it. he says he checked all the relays and fuses. Any one got any Ideas? The manual I have dosen't really address the problem. Need ideas fast these techs love to crank up the time on electrical problems.

Thanks flyboy

2005JGC 10-23-2011 04:07 AM

Ill check to see if I can find for sure tomorrow, I am fairly certain there is a pcm update for this concern.

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Frango100 10-23-2011 07:41 AM

Re: EVAP code P0443
Fuse 21 (10A) on the junction block under the steering wheel is feeding the EVAP/PURGE solenoid. The ground is switched by the PCM. So check out this fuse first.

flyboy 10-31-2011 10:00 PM

Re: EVAP code P0443
Checked the 21 fuse, its good. I got power to the fuse but no power to the purge valve from the fuse. PCM indicating almost 14 volts output, too high. Looking to purchase a new PCM. any Ideas or is there possibly an update for this problem?

Frango100 11-01-2011 03:07 AM

Re: EVAP code P0443
There should be constantly battery power on point 1 of the EVAP solenoid connector. If not, you have a wire breakage in between the fuse 21 and the purge solenoid. Point 2 of the connector goes to the PCM and the PCM will switch (pulse) it to ground depending on some other inputs.

flyboy 11-01-2011 09:01 PM

Re: EVAP code P0443
I will check it out and let you know

2005JGC 11-01-2011 11:22 PM

Re: EVAP code P0443
I finally looked, no pcm update, must be newer wj (i remember it also being a 4.7l) anyway, possible suggestions would be if the purge solenoid was mouted upside down, there should be an arrow indicating up. Also if you (or the gas attendant here in OR) overfills your fuel tank you can get raw fuel into your evap system and cause issues like this.

flyboy 11-03-2011 02:24 AM

Re: EVAP code P0443
Re checked the #21 fuse, found it burnt out so I replaced it. Also found an AC clutch fuse and an AC relay was bad, replaced them. When I turned the car off and restarted it the engine warning light was gone. hasen't come back. I think the mechanic at the shop had a slight vision problem, couldn't see well enough to complet the job corectly.
any way thanks Frango 100 and 2005JGC for the help.

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