Quote:
Originally Posted by Martind4
If it's on a Freightliner Chassis, call 1-800-FTL-HELP. Have the last 6 digits of you VIN# ready and they can tell you exactly what's wrong.
They have a great reputation for solving these kinds of problems.
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I agree.
I didn't jump in because my 2000 model sounds like the Odometer setup is different from yours.
Chassis in my model year range have all of the instruments driven off of a Controller Area Network (CAN) bus. What this means is that a single pair of wires carries all of the gauge data from the engine area to the front where a "spider harness" re-distributes it to the individual gauges. Each gauge is able to recognize its own data on the bus so you can do things like swap the cables between the speedo and the tack and both gauges continue to work normally.
My odometer went out (it would just freeze at a point for many miles) but that was because the road speed data which is fed from the Allison transmission to the Cummins ECM was getting corrupted. If yours had a similar setup, I'd figure that it had to be something in the display head itself because all my odometer is is a multiple position set of lights. The actual numbers are generated in the electronics and transmitted via the CAN. When my odometer failed, the speedo was failing, too. I have VMSpc, a pc program that reads the CAN messages and I could see that speed data was not on the CAN buss. I found a loose connector in the road speed data feed circuit right before it went to the Cummins ECM. I got no error message for that, just a check engine light and a "road speed invalid" message on the bus.
I'm not sure that any of this would be much help to you. BTW, I worked with Freightliner support on my speedo problem and after I fixed it, they wanted to hire me. I learned more about how the CAN works on their chassis than many of their techs knew. I can assure you that I didn't want to know that much about it.