post #1 of Old 12-05-2013, 03:37 PM Thread Starter
wsmm
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2000 XJ Cherokee 
 
Join Date: Feb 2007
Location: michigan
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Question Request for Diagram for 2002 Grand Cherokee EVAP System

Looking for a good diagram, with explanation , if possible, of the EVAP system on a 2002 Grand Cherokee and my codes went away, P0442 and P0455. Getting a P0455 error once again, have replaced some of the hoses so far. Last smoke test, I received some smoke out of the Vent that was part of an earlier recall. I believe that it was called the orvr valve, I know it is a vent to the atmosphere, but I don't know if it is open to the system all the tme or opened and closed by some part of the system. Ages ago when I got started in Jeeping, I had a dealer and club that I could go to and get most if not all of my information. Not so now a dyas. Also the older manauls seemed to explain all of the systems much better.
Thanks,
Bill

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post #2 of Old 12-07-2013, 05:51 PM
JGCIndy
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2003 WJ 
 
Join Date: Dec 2013
Location: Indianapolis
Posts: 2
Here is what I found.

Mine is giving the same two codes. I found 3 different split hoses, which I replaced, but the code keeps coming back.
It still ran fine until I overfilled the gas tank and it wouldn't start, so I waited a bit, and pumped the peddle repeatedly and it finally started.
Since then, it will intermittently die...either while idling or even while driving down the highway.
A couple of times so far I couldn't get it to start after several tries. I let it set for a few hours and then it'll start right up.
I'm almost thinking my PCM is going out.

The first diagram has the parts identified here... http://www.factorychryslerparts.com/...ssembly=630873
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post #3 of Old 12-07-2013, 09:16 PM
kc2mrg
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subscribed, this is a great picture, i need to fix mine, been too lazy to try and diagnose tho lol

2004 Grand Cherokee Laredo 4.0
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post #4 of Old 12-12-2013, 10:06 PM
JGCIndy
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2003 WJ 
 
Join Date: Dec 2013
Location: Indianapolis
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I solved my problem by doing two things...
1 was by cutting the split end off of one of the hoses connected to the charcoal canister and reconnecting it and the other was to replace the crankshaft position sensor.
Now, the check engine light has stayed off for over 100 miles and it hasn't died on me a single time.
The sensor only cost me $34 at O'Reilly Auto Parts.
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post #5 of Old 12-13-2013, 04:57 AM
Prickett10
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2000 WJ 
 
Join Date: Jan 2013
Location: Montgomery
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Quote:
Originally Posted by JGCIndy View Post
Here is what I found.



Since then, it will intermittently die...either while idling or even while driving down the highway.
A couple of times so far I couldn't get it to start after several tries. I let it set for a few hours and then it'll start right up.
I'm almost thinking my PCM is going out.
this sounds exactly the same as my problem, I have yet to figure out why the codes happening but I was able to keep it from dying by disconnecting the hose that runs from the purge solenoid to the throttle body. And no its not the solenoid, that's been replaced repeatedly trying to solve this problem.

Colorado Jeep Club Member #271 2000 4.7L WJ
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