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ECU Reading vs Odometer

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ecu odometer
8K views 15 replies 8 participants last post by  v6alfa 
#1 · (Edited)
I am just wondering why my Odometer says 85010, but when i read off the ECU its says 81000, which 4000 miles out :confused:

Is this normal to be so out between the two or is there a reasonable explanation for this like its faulty etc....
 
#6 ·
Both the ECU and the speedo work it out independantly (and slightly differently) ... basically both take the integral of the speed, but because one is hardware and the other is software there will be rounding errors ... as long as they're withing 10% you should be happy :thumbs:
 
G
#7 ·
If reading the ECU value with FiatEcuScan, better ask the question in the forum there. It looks like there are certain corrections which need to be applied to the ECU values. Not sure how that would work out on mine, as both Odometer values in FES show zero. :)
 
#13 ·
A speedo and odemeter will always be more inacurate by design no car manufacturer makes the speedo acurate due to the danger of it under reading rather than over reading and the law suits that would follow from drivers who had been done for speeding
If that makes any sence at all lol i know what i mean
 
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