Went to check the resistance again with the battery disconnected and still got between 41-41.5. Not really sure what that is telling me since it should be either 60 or 120. Any suggestions? Thanks again for all the help you given

 

You're right the resistance readings should be 60 ohms if the CAN bus is ok. The resistance readings you're getting confirmed what I was thinking with the voltages you posted. Your CAN bus is slightly shorting together. If you had an oscilloscope that could be proved 100%, but I'm going to work on you not having one. Since you have so many codes about the lack of coms with the ABS module I would say with the battery disconnected and the ABS module unplugged take the ohm readings at 6 and 14 again. See if it goes to 120 ohms. The ABS module is one of the terminating resistors. If it does go to 120 then the issue in the ABS module. If it does not then take a look at the transfer case module behind the battery. That is a pass through to the ABS and it does get corroded pretty often.

 

Thank you little green giant. You’re right I do not have a scope. I will go back and unhook the ABS and re-pin 6&14 with the battery disconnected. I have had the TCCM out several times and it looked good. I didn’t see any corrosion. I also opened it up and saw nothing that looked burnt under a magnifier. Once I get it checked again I will let you know what I find. Thanks again.

 

Well… I went back and checked Pins 6&14 with the battery disconnected and the ABS disconnected and I still got a 41.1 resistance. I checked the TCM for corrosion and saw nothing. I’m at a loss and don’t know where to go now. Was really hoping it was the ABS module. Any advise? Thank you again.

 

Ok time for some advanced diag . This is a bit tedious and painstaking but we will get to the bottom of it. I will walk you through as much as I can.

Take off the panel at the bottom of the A pillar by the hood release and access connecter C0223. Split that with the battery still disconnected, but the ABS module still plugged in. Take the resistance reading from the OBD connector at 6 and 14 again. If you still have 41 ohms then the issue is in the area of the steering angle sensor or the instrument cluster. Get to those and disconnect them and see if that reading changes. If one does then that module is the issue.

If you have 120 ohms (which is a good reading with how the truck is at the time of testing then you need to go to the female pins of C0223 and take the readings ohming from pin 9 to pin 10. If you have the 40ish ohms on that side let me know and I will give you another easy to access connector to split in half and do the same thing so we can isolate down where in the truck the cause is.

 

Ok. I sure am glad you are helping me. Your Knowledge is amazing!! It’s currently still sitting outside at the Indy mechanic and I would like to get it home to make it easier and especially now with your knowledge I feel very confident we will get it figured out. They are calling for storm’s tomorrow so I may not be able to get out there but looks nice for Monday. I will still try tomorrow if I can. Also if I’m able to trailer it home it will be much easier for me to check things out. Thanks so much again and stay tuned for the next update.

 

I was able to get out just for a minute before the storm cut loose. I took a couple of poor photos in the rain, but hoping you can identify which one of these is 223. I plan to go back tom after work to do the diagnostic tests. Thanks again.

 

Ok. I went to the passenger side and popped off the panel and it looks like that’s where I need to be. See attached photo of the passenger side plug that I unhooked. I unhooked the plug and rechecked 6&14, still 41. I then unhooked the steering angle sensor (I think) under the drivers side steering column close to the brake switch. Still got a 41. I didn’t have the right wrench and torx bit to take out the cluster. Will unplug that next and see. Sounds like everything is pointing towards the cluster. Let me know your thoughts. Thanks for the help.

 

 

This is Little Green Giant, they approved my name change!! Ok we confirmed it is on the other side of the circuit. Reconnect everything you disconnected except the battery. Take out the battery and disconnect C2365 / C2366. Take a resistance reading across pins 4 and 5 on each side of that split connector. See which side has 120 ohms and which side has 41 ohms and send

me a picture of the face of the connector with 41 ohms. That will show me which side has the issue and we can continue splitting it from there.