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2017 Pacifica CAN hi / low

  • BLEE
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24 Aug 2019 18:00 #33104 by BLEE
2017 Pacifica CAN hi / low was created by BLEE
2017 Chrysler Pacifica CAN hi / low good waveforms and then randomly bad waveforms...troubleshooting drivability issues...any inputs greatly appreciated! Thanks.
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24 Aug 2019 21:57 #33109 by Cheryl
Replied by Cheryl on topic 2017 Pacifica CAN hi / low
Any codes? Any symptoms?? Those waveforms look bad

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25 Aug 2019 11:55 #33119 by Tyler
Replied by Tyler on topic 2017 Pacifica CAN hi / low
Are you at the DLC, or one of the CAN C modules?

I'd suspect a bad module ground, since the bias is going above 2.5V in the bad captures.

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26 Aug 2019 13:36 #33144 by BLEE
Replied by BLEE on topic 2017 Pacifica CAN hi / low
There are 37 modules on this van and once the car acts up I get around 20 "U" codes on various modules not communicating with each other. It is very intermittent when the van does act up. It will run fine and my oscillospoce shows good CAN hi and CAN low waveforms but once it acts up, I get bad CAN hi and CAN low waveforms. The problem is it only acts up every few days only for 15 minutes or so. When it does act up everything is going crazy and I cannot shift the vehicle out of park either. The pictures of the bad waveform seem to be the 2.5vdc idle (rececessive state voltage) that is going crazy. I am at the DLC with a breakout box doing my scope work. Any help is greatly appreciated.

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26 Aug 2019 18:29 #33152 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2017 Pacifica CAN hi / low
can you post a wiring diagram of the network?? i dont think all 37 of those modules would be on the high speed network.

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26 Aug 2019 21:59 - 26 Aug 2019 22:15 #33157 by Chad
Replied by Chad on topic 2017 Pacifica CAN hi / low

cheryl hartkorn wrote: can you post a wiring diagram of the network?? i dont think all 37 of those modules would be on the high speed network.


It is 7 pages. :woohoo: That would be 14 screenshots and uploads (the way I, usually, post diagrams)

Trying something new...

File Attachment:

File Name: PacificaComNet_1.pdf
File Size:962 KB



Well,...that didn't turn out so well. :( Converting to .pdf lost the color. :dry:

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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Last edit: 26 Aug 2019 22:15 by Chad.

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27 Aug 2019 10:13 #33170 by BLEE
Replied by BLEE on topic 2017 Pacifica CAN hi / low
Here is the CAN "C" bus wire diagram...I wonder if these issues is a software issue perhaps?
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27 Aug 2019 10:17 - 27 Aug 2019 10:19 #33171 by BLEE
Replied by BLEE on topic 2017 Pacifica CAN hi / low
The issues only seem to be on the CAN "C" Bus and not the CAN "IHS" Bus.
Last edit: 27 Aug 2019 10:19 by BLEE.

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27 Aug 2019 18:32 #33181 by Cheryl
Replied by Cheryl on topic 2017 Pacifica CAN hi / low
So we’re not worried about the pins 6 and 14?? It’s possibly can c part of the network??

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28 Aug 2019 13:56 #33223 by BLEE
Replied by BLEE on topic 2017 Pacifica CAN hi / low
I am measuring off of pins 6 and 14 for CAN hi and CAN low; that is where I am getting my data.

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28 Aug 2019 18:26 #33238 by Chad
Replied by Chad on topic 2017 Pacifica CAN hi / low

Tyler wrote: I'd suspect a bad module ground, since the bias is going above 2.5V in the bad captures.


I agree with Tyler. If you find the "Start Connector", you can remove modules, 1 by 1, from the network.

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

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28 Aug 2019 18:50 #33239 by BLEE
Replied by BLEE on topic 2017 Pacifica CAN hi / low
I can get to the star connector, but the problem is that it is very intermittent and when it does act up it only does it for about 5-7 minutes each time and then it goes back to normal.

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05 Sep 2019 16:31 #33433 by BLEE
Replied by BLEE on topic 2017 Pacifica CAN hi / low
I found the problem. It was a loose connection at the star connector.

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