E38 Speedometer Correction
Has anyone figured out the amount you can adjust the speedometer where you wont get an ABS code on E38 trucks? What is the best way to correct the speedometer with EFI Live? If I have a tech II can I correct the speedometer stuff in the ABS module without the tech II being online if its up to date?
anyone
no is correcting speedometers out there?
I'm not sure what the problem is. we don't have any E38 trucks in OZ, but cars have gone from 3:07:1 diff gears to 3.9:1 with no issues. From memory, you may need to alter both the TCM and ECM settings though ( for auto models ). I haven't done one for a while now.
Simon
Simon, I hear of this problem on the Diesel trucks too, it's something to do with once the tire size goes over a certain figure the ABS throws a code, I am sure TechII is the only solution.
I no longer monitor the forum, please either post your question or create a support ticket.
Ahh, is this a rear tyre vs front tyre discrepancy? So the actual wheel speeds would be significantly different between the front and rear wheel? I can see this as causing big ABS issues. Or it might just be an ABS rational check that assumes that at a certain speed, the ABS sensors should be giving a certain number of pulses. Fitting larger wheels may make the ABS module think the wheels are sliding as the pulses ar too slow for the given road speed.
This is some info that I have for the diesel trucks, but I would think that all the trucks would suffer the same issue.
http://www.duramaxdiesels.com/forum/...=ABS+Tire+Size
Originally Posted by turbo_bu
Thanks!
Thats exactly what I was looking for. I knew it had to be in the 34 or 35 inch range just from past experience but I wanted to see what others had found.
So you cant adjust the speedometer at all?
Yes you can but at some point (as shown in that thread) the ABS module becomes a problem.
I no longer monitor the forum, please either post your question or create a support ticket.
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