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U need to program the abs ecu which is say good fking luck hehehe
The engine ecu reads road speed from the abs ecu
It might be easy fix it might be hard
But finding if it's going to be hard or easy well this is the hard bit
So unless u put a scanner on it and read abs trac etc live data
While your driving then u got nothing to go by
On the Holden's my scanner will show me the wheel speed for each
Wheel and then I compare that to the actual wheel speed
But for now forget about engine ecu until u get abs ecu reading correct
Figures then maybe u can look at reprogramming engine ecu