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Thank you very much. I will try to troubleshoot and post my findings. With my old controller I had no ABS light so it comes on everytime I put the replacement. So I decided to just stay with my old one.The ABS fault disappearing when CTIS is unplugged indicates to me that it is probably a programming conflict. The CTIS is connected to the ABS, trans and engine controllers via the J1939 and J1587 data busses. I don’t think there is any actual or planned interaction with CTIS, they simply did it so it was one stop shopping for any programming, access and diagnosis...
If the ABS fault appeared when you plugged in CTIS, then it is probably a version or programming incompatibility, or there is a fault in that CTIS.
If it all of a sudden popped the ABS fault without you doing anything with CTIS, then perhaps it is some failure in the CTIS effecting comms on one of the data busses that the ABS controller is sensitive to.
You need to read the codes to see exactly what it is...
Or, you could disconnect the data buss connections in the CTIS connector and go on with your life as the CTIS operates independently other than receiving a speed signal and driving the overspeed warning light, which it accomplishes directly with hardwired signals with out need of the data busses...
Many ABS systems will complain if they see differing wheel speeds and the codes will typically self clear. It could be the case on these as well. We have that problem a lot at my shop working on vehicles when we run them on a lift and wheel speeds are all over the place so the controller just freaks out and throws codes. Usually you drive them on the street a bit and they will self clear or we sometimes reset them manually before we return the car to the owner.Paging @Ronmar : Reviving this thread to ask a different question. I have a 2003 M1078A1. Today I was backing up a steep icy driveway with chains on the rear wheels in “mode” (locked differential). There was a little bit of wheel slip and when I got to the top I noticed my ABS light was on. I was parking my rig for the night so I didn’t have a chance to see if the light cleared on its own. I did check all the rear airlines to see if I could see any signs of the chains interfering with the airlines or sensor wires and they all looked pristine. Could it just be that the ABS system was picking up the wheel slippage and will self clear in the future?
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