Read about the Great Fleets Across America
Subscribe

School Bus Fleet Magazine Forums
School Bus Fleet Magazine Forums
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Professional Garage
 Enter Forum: Professional Garage
 02 gm b7 3126 ecm
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

wocobus
Active Member

United States
17 Posts

Posted - 06/27/2013 :  11:04:54 AM  Show Profile  Visit wocobus's Homepage  Reply with Quote
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 .

Wolf0r
Top Member

USA
2179 Posts

Posted - 06/27/2013 :  1:30:48 PM  Show Profile  Reply with Quote
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
Go to Top of Page

wocobus
Active Member

United States
17 Posts

Posted - 07/01/2013 :  06:40:31 AM  Show Profile  Visit wocobus's Homepage  Reply with Quote
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.
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
 


School Bus Fleet Magazine Forums © 2013 School Bus Fleet Magazine Go To Top Of Page
This page was generated in 0.16 seconds. Snitz Forums 2000