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Vref Error
I have 2 reports of Vref Errors and they are reading right around 5V, which is normal, what can cause this? The picture below was taken from a video of one of the customers machines. the other codes are sensors that are picking up and dropping from what i am assuming is the root of the Vref Error.
Customer support service by UserEcho
If the value differs only a little bit, the error will come up. It might have been a little spike or dip in the voltage...
It would be helpful to know when this happens, during startup or when starting an engine.
Are there sensors hooked up to 12V but are they said to be on VREF in the software?
The picture was taken from a video where the errors were constantly flashing (1-6). The machine did not need to be running.
Until now I did not know there was a setting for sensors that are hooked up to the VREF in the software. One of the reports has only one sensor hooked up and is on the VREF setting correctly. This one is reading occationally 5.2.
Is the VREF error enough to cause a No Contact Error?
Check your negative or reference 0 volt chassis wires.
We just had an interesting case of Vref errors appearing only when cranking over the engine on a 24VDC system with an MD4 and XC43. The Vref error was usually on the XC43, but occasionally on the MD4 as well. After tracing power/ground supply wires and checking all connections and testing for voltage drop during cranking (thinking there was a voltage dip while cranking causing the errors), we found that the +Vrefs from each module had mistakenly been tied together. Disconnected the +Vrefs and that solved the errors.
Easy fix, but not exactly the way I would've expected the errors to behave with this wiring issue. I would have expected the errors to trip more often than only while cranking, but I suppose the slight supply voltage dip must've been causing some fluctuation on the Vrefs that was different between the MD4 and XC43 enough that it tripped the error.