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View Full Version : lt1 flashing not going to happen?



rytari
10-05-2015, 08:24 PM
Hi

i have 94 caprice wagon with lt1

i tried to adjsut my speedometer because i was a bit off, (shows 70 mph when gps is 52) i found some spreadsheet what to use for calculation and download orginal bin file from the car using C.A.T.S flash program, first i had some difficulties to get connection, some error came but i reboot my computer and it helped.

went to tunerpro and change those 3 values for speedometer, save file wihth new name and opened flash program again...

then i tried to reprogram my ecu, program connected, started to erasing flash memory but suddenly i got error message about some violation and writing stopped and canceled...

now i cannot get connection back again and my fault light is on in dash...

been trying few things, reboots, resets, but no luck at all.. what to try next

lionelhutz
10-05-2015, 11:23 PM
The PCM is most likely bricked. The only way to fix it is to take it apart, unsolder the flash chips off the board and use a programmer to program them.

rytari
10-06-2015, 05:20 PM
Any more info how to do that

lionelhutz
10-07-2015, 07:09 AM
I don't have any links at hand but there is lots of info around. Begin your search for something like socketing a 8051 PCM or socketing a LT1 PCM and go from there.

kur4o
10-07-2015, 12:52 PM
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?4588-LT1-ECM-16188051-repair-source

Here is recent link with detail explanation what to do.

EDZIP
10-08-2015, 04:25 AM
rytari

This thread is related:

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1160-64K-bootable-image-for-95-LT1-PCM&p=53539#post53539


If you need any help..send me a PM