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85ChevyC20
05-23-2021, 07:07 AM
Hey guys


A little new to the forum but I need some help. So I got a PCM and a wiring harness from a 1998 Tahoe and I want to reprogram it. Ive seen bench harnesses online for LS1's and stuff but how do you make one for the vortec style pcms with the four connectors? any recommendations?

thanks
Fast355
05-23-2021, 07:20 AM
Hey guys


A little new to the forum but I need some help. So I got a PCM and a wiring harness from a 1998 Tahoe and I want to reprogram it. Ive seen bench harnesses online for LS1's and stuff but how do you make one for the vortec style pcms with the four connectors? any recommendations?

thanks

LT1 swap page for the wiring diagram. Need power and ground as well as serial data. From memory only uses one of the 4 connectors to flash it. I have one I made years ago but have not used it in several years. My L31 based engine runs on a 2005 Blue/Green 1 meg PCM.
85ChevyC20
05-23-2021, 07:38 AM
wow thanks! do you possible have the link to the page? im dumb and cant find it xD
Fast355
05-23-2021, 08:00 AM
lt1swap.com
dave w
05-23-2021, 06:43 PM
The attached document was sourced from the Free Version of EFI Live V7.5

dave w
85ChevyC20
05-24-2021, 06:53 AM
Thankyou very mcuh