I swapped engines from a 01 gm b7 170 hp to a 02 gm b7 190 hp with a bad engine and ecm . I tried a 190hp ecm off of a 99 and 2000 runs fine but the speedometer and odometer is wacky. I do not see a speed sensor buffer like the 99 b7 has . I thing the speedometer must be calibrated in the ecm. can the 2000 or 99 ecm be repogrammed to operate the speedometer. or do i reprogram the 2001 170 hp ecm that makes the speedometer work to 190 hp and recalibrate the tire size and gear ratio. would a tech 2 scan tool do the speedometer part .
Tech2 won't do anything but ABS brakes on a GMCV with a CAT. I would check into getting the correct calibration for that engine serial number, CAT should be able to bench flash it from the dead one. Do you have CAT software?
“The good thing about science is that it's true whether or not you believe in it.” Neil deGrasse Tyson
i do not have cat software. took the 170 ecm and 190ecm to cat to get a bench flash $190 and $500 for the 190hp up grade . works good now. thanks for the qwick response.
02 gm b7 3126 ecm
Posted - 06/27/2013 : 11:04:54 AM
