Dover T4 Fault 16

Hey everyone

3 car group, Dover T4s. Car 2 is having fault code 16 on every run. Reads group dispatch error. I’ve checked all my power supplies. All running at bit under 25v. (24.76) Car was getting this code about once a month. Then once a week now it’s once a run. Any help is appreciated.

Power everything down one at a time, and restart with a laptop hooked up. It should so a system confidence test. See if it says all is ok.

We were getting this fault code often . Oddly enough group of three and it was car number two. Ours would drop the calls and passengers would think they were stuck. It would restart on its own after about 30 seconds. Check communication wiring and shields. We were leaning to the CPU board, and of course you have to replace the CPU board in all three. One day the power supply failed on car number two, we replaced it and along with the DSP back up battery (on all three)and we have not had the complaint or the fault show up yet. That was about two months ago. Might just be coincidence,....and I am holding my breath now that I am typing this.

Did you check the ripple on the PS1 power supply? Replace it if there is more than .010 vac. If all your confidence tests are a GO and you’ve already cleaned your card connections, try unplugging the load weigher J4.

Make sure your wiring looks like this:

https://www.dropbox.com/s/10jcfhw7ofvvyd0/Group%20Comm%20Wiring.pdf?dl=0

Thanks for the replies and the wiring diagram as well, heading to the job now. Solid that sounds exactly like what is going on with our job, to the T. I will let you guys know how it turns out. Thanks for the info. Ill check the confidence tests and the PS1 power supply today, Ill keep you posted. Thanks everyone

This issue has started to come back up again. We replaced the PS1 and it ran fine for one month. Started right back again. I am confident that it is a PS issue as if we adjust the voltage a little low, this code pops up on a constant basis. We can adjust it higher (12.6 and 5.6) and it will run for a few days and comes back. The only thing PS1 feeds is the DSP. The input voltage feeds all the other Power supplies. So I do not think it is a noise issue on the input side. We did put a surge protector on just the PS1 and that did not help. Unless someone has another idea, I believe we are going to send the DSP off for repair.

Does this car with the 16 error problem have a separate group controller or integrated group control?

The CPU and I think the PMI cards use that 5v supply too. Make sure the card cage fan is working and ALL of your contactors have suppressors.

It has integrated group control, will check suppressors.

Can put this one to bed. Voltage Monitor contacts 11 and 14 feed all four power supplies. Replaced Voltage Monitor and problem as not come back. Luckily we were there and the monitor was dropping in and out on us.