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Old 11-24-2021, 07:47 AM   #11
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All those things could create problems, even change the resistance some, but not likely to give me those results

Mounting causing board flex, I am sure this board has spent a great deal of time going through extensive dynamics testing. I would suspect that they even use HALT (temp and vibration) in their design process. There could be a crack, but it would be manufacturing flaw.

These connectors are rock solid, I have inspected and cleaned. I went down a path of thinking water was causing an issue with one connector specifically.

A wire harness issue would also be a possible issue, highly unlike that it would show up as just this resistance issue.

The 42 ohms that I am reading in some ways defines possible issues. The termination for the circuit is suppose to be 120 in the PCM and 120 at the communication module. If we read the two 120 ohm resister in parallel we should get 60 ohms. (Bus should be between 54 to 66 ohm). If you were to add a second module with 120 ohm termination resister, with parallel resistance you would come in around 40 ohms. This is where MG's idea of finding the module and pulling off the resister comes from. I have been discussing issue with MG offline, initial thought was that an additional module was terminated on the bus.

Being that the PCM being isolated shows that the 60 ohm value is coming from it. Not really sure how it is laid out, but it is possible they use a split termination scheme ( 60 to 60 ohm in series with a cap to gnd in the middle). One could surmise that one of the resisters is shorted as a possibility.


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Old 11-24-2021, 08:03 AM   #12
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Along those same lines, we purchased a Jeep 4xe and while we havenít had any problems, many have reported electrical related issues on the forums that shuts the vehicle down and lights up the dash, seems to stem from the wiring harness and faulty or bent pin connections during assembly

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Old 11-24-2021, 11:04 AM   #13
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Originally Posted by REF View Post
...seems to stem from the wiring harness and faulty or bent pin connections during assembly
Ah yes... the faulty or bent pin hypothesis.

I finally resolved an intermittent error code in the Allison trans in the Cummins van that seems to have been caused by poorly connected TCM terminals. I probed all of the female terminals in the connector and found that five (out of 85) pins were loose or very loose fitting (barely making a connection) with the mating terminal. two of the five pins happened to be related to a sensor that would fault and throw the code.

So yes...faulty or bent pins can cause problems. I haven't had the error since the connector repair.
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Old 11-24-2021, 12:24 PM   #14
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All possibilities, I don't want to think of the hours of my life lost to hunting down bent pins in sockets. backplanes cables you name it. This goes from mainframes to servers, I've probably installed more processors and memory in a motherboard in one day, than most people will do in a lifetime. Ok maybe slightly exaggerated, in a couple of days.

I did give all the cable connection a good lookover, if my eyes were twenty years younger I'd feel more confident.


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