hughesjm21 wrote:
I had 02 Horizon with strange gage readings. Before replacing gages I called freightliner tech support. They had me replace a computer module (I cannot remember what it was called) in back of the coach. This solved the problem. It was not the gages. I suggest you call chassis manufacturer tech support and discuss problem with them.
I agree. Call the freightliner help desk ( 1 800 ftl help) and have the last 6 digits of your vin number available. Ask for the troubleshooting document for your gauges. The way your air pressure gauges work is two air lines going to the VDU (vehicle data unit), with resulting electronic signals being placed on the common chassis bus for the instruments.
Also, there were some solder issues on the VDU unit. There is a document on IRV2 forum that outlines how to repair. On IRV2, find the files section, go to electrical,and look for VDU/VDC repair.
I hope this helps.
Fred