Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 06-20-2011, 01:37 PM
New Member
 
Join Date: Jun 2011
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
bajan is on a distinguished road
Albert

I installed a new pcm in 4.7 cheroke and it worked fine for 3 weeks, then it gave a no start condition on two occasions finally not starting again.
Pcm not communicating on bus and Skim is showing warning light with a line through it.

I had it scanned and the tool is not communicating with the pcm
the skim is showing SKIS failure and the bus is showing 2 open circuits

i need your help
__________________

__________________
Reply With Quote
  #2  
Old 06-20-2011, 01:49 PM
cheapjeep's Avatar
Amber Instigator
My Jeep: 1997 2.5L TJ
 
Join Date: Sep 2010
Location: Vintondale Pa.
Posts: 3,119
Thanks: 98
Thanked 70 Times in 65 Posts
Rep Power: 331977
cheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond reputecheapjeep has a reputation beyond repute
Garage
Re: Albert

I'd check all o your pcm connection first.One might have a bad connection.Also I'm sure you already know that you have to have the pcm flashed or your key.
__________________

__________________
Dave'04 Overland,I don't even remember what I did to it anymore.

Quote:
Originally Posted by TJXJWJ View Post
OK, fine...I'll admit...some amber lamps are good, and necessary.
Reply With Quote
  #3  
Old 06-20-2011, 05:23 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,065
Thanks: 9
Thanked 105 Times in 98 Posts
Rep Power: 526057
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: Albert

For which reason did you have to change the PCM?
The PCM most probably was flashed with the SKIS info, otherwise it would have never worked from the start.
As cheapjeep mentioned, remove/check/connect all PCM connectors and pay special attention that no connector pins are pushed back.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #4  
Old 06-22-2011, 02:38 AM
2005JGC's Avatar
Senior Member


My Jeep: 2005 4.7L WK
 
Join Date: Nov 2010
Location: Portland, OR
Posts: 2,751
Thanks: 51
Thanked 69 Times in 58 Posts
Rep Power: 1653012
2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute
Move your coolant reservoir and get to your pcm connectors. I like to put my multi meter on my 5 volt supply on the easily assessable map sensor. Key on I am guessing you will have nothing. Now one at a time grab the pcm connectors and jiggle... Just a hunch but one of them I'm guessing you will see your 5v come to life at which point your rig will start. I have had a couple recently where the connector is clean with no corrosion and a pcm cured the concern... Both with dieout issues no communication and skim codes. My best guess is apoor solder in the pcm.

Interestingly enough they were 4.7 wj's
Sent from my SCH-I500 using Tapatalk
__________________
2005 Jeep Grand Cherokee - Gone but not forgotten!

Reply With Quote
  #5  
Old 06-23-2011, 12:00 AM
Member
My Jeep: 1999 4.7L WJ
 
Join Date: May 2011
Location: Sunny Colorado
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1721
bacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond reputebacernate has a reputation beyond repute
Re: Albert

Haven't seen this on a wj but replaced alot of pcm's on dakotas and durangos. They are dropping like flies. A shorted cam or crank sensor can also take the network down. Unplug them one at a time and see if the pcm comes to life. I assume your check engine light is also out koeo when it won't start, that's a dead give away the pcm is down.
__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:17 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.