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Unread 01-03-2012, 09:35 AM   #1
cvisinho
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2005 TJ Wrangler 
 
Join Date: May 2008
Location: Warwick, RI
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Cherokee issues/occasionally starts

It is a 2000 cherokee 4.0, he is an older gentleman with minimal mechanical skills.

I scanned the computer and received 2 codes.
P0340 – which is the CPS
P0305 – cylinder 5 missfire

It will start 1 out of 7 days.

I tried starting it and sounded fine except it wouldn’t fire up.
I checked all connections looking for disconnected wires etc, all looks fine and the battery is currently on a charger to freshen it up, there is gas in it as well.
It has been sitting since Sept for the most part except the occasional start.

I am going to change the spark plugs for him and swap in a new CPS to see if that works.


Any help/suggestions are appreciated

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Unread 01-03-2012, 10:14 AM   #2
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,414
P0340 is no cam signal at PCM.

My first thought is that this is a camshaft position sensor issue. However, it is still possible that the crank sensor is involved, but usually when the crank sensor is involved, it will set an additional code (along with the P0340) like a P0320.

I would look to the cam sensor first. They can be tested with a manual and a meter and I'd certainly test it.

Here are a couple of links on the P0340 that you should check out......

http://www.justanswer.com/jeep/33mij...-no-spark.html

http://www.obd-codes.com/p0340

Good luck and let us know how this is resolved!
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Unread 01-03-2012, 10:34 AM   #3
buildin1XJ
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1999 XJ Cherokee 
 
Join Date: Oct 2011
Location: Knoxville, Tn.
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Trouble codes

Also go through all of your grounds and scrape any debris from them,pay special attention to the grounds down an the block next to the oil dipstick tube and ground that attaches from the back left corner of the block to the body, I'm not certain on the 2000 model where others are located since the newest jeep I own is a 1999 with distributor and you have coil packs and from my understanding your CPS is attached to the top of the oil pump drive. Remove onlu the CPS and not the OP drive. The CPS probably is the cause for #5 misfire. Also have a good strong battery that has good clean and tight connections. Hope this helps since all the true XJ gurus are probably at work right now.
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Unread 01-03-2012, 10:37 AM   #4
buildin1XJ
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Listen to Tj

He is one of the better XJ gurus on this forum
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Unread 01-03-2012, 11:07 AM   #5
cvisinho
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Thanks guys, Ill keep you posted.
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Unread 01-04-2012, 06:50 AM   #6
cvisinho
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changed plugs but battery was reading only 5V so i left it on the charger overnight.
CPS should be in tomorrow so ill swap that in when i put the battery back in.
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Unread 01-09-2012, 08:15 AM   #7
cvisinho
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battery fully charged, new CPS installed = Still no start
Suggestions?

Not sure whats next. It might end up going to the shop as he is trying to sell it relatively soon and i can only get at it on the weekend for the most part
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