Western Star Gauge Problem-This is Bizarre!
Discussion in 'Western Star Forum' started by 04 LowMax, Feb 16, 2014.
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We had one of thos rx modules sent to us by mistake when we ordered the ecc that the freightliner dealer said controlled the gauges, but they're not much help around here, we replaced the old rx module with our new one and still no gauges, ill try and see if we can get our hands on a speedo
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I don't have any technical info on the Stars but most data bus setups have a terminating resistor on each end. When the resistors go bad it can cause some real screwy stuff to happen.
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I looked up your age of truck and made one mistake, your rx and speedo connect to the 1587 data bus separately, the speedo picks up what the rx sends out on the main bus, and gets the rest of it's info from the main bus. I'm use to newer trucks where the rx is connected to the 1939 data bus and then the speedo is connected to the rx module directly using their own special 1587 bus and the speedo, and thus the gauges get all their data from the rx.
The difference now is that everything the speedo displays is picked up from the 1587 bus and not all of that gets transmitted by the rx (rpm, oil pressure, etc). You've already replaced the rx since you were sent one so we know that's not the problem.
Do you have a datastar in the dash? If so and its working fine then I'd point the finger at the speedometer.
I think it unlikely the issue is with a terminating resistor simply because if the main buss was missing one, or had some other issue, you should notice other issues, and I'd think the gauges would act weird instead of doing nothing at all.
One other thing to check I just remembered is the daisy chain wiring between all the gauges themselves. they all have the same connector on the back, and the speedo has one too. If the one connected at the speedo has a bad wire in it then none of the others will get a signal, you can move the connectors to different gauges so I'd try changing which one is connected to the speedo. I've seen that before.
I also don't think its a ground issue because there is a common ground in the speedo that everything uses and the gauges illuminate.
If your still having an issue with this I can get you wiring schematics if you give me the last 6 of your vin.Cummins Fanboy Thanks this. -
Thank you for the info Mythandar, i did not have a chance to work on the truck today but i can answer a few of the things you pointed out. It does have a datastar in the dash and it was not working at first, it kept saying no data available, now it started showing temps only(coolant, diffs, and battery voltage) we did not do anything it just randomly showed up one time we turned the key on and it is showing every time now. The truck also runs perfect with none of the gauges working. A wiring schematic would help a great deal, we can only seem to find ones for newer trucks. The last 6 of the vin is W75554. I will try switching the connectors on the daisy chain tomorrow and see what happens there.
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Attached Files:
Cummins Fanboy Thanks this. -
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Just a quick update we found the issue. The people that painted the truck took the plug to the data link on the firewall and plugged it into the marker lights on the side mounted air box. I appreciate the help Mythandar
04 LowMax and QUALITYTRUCK Thank this. -
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