Ecm swap

[k1500 97]

So i decided to try somthing. My obd2 dosent work so i took a ecm from a 97 tahoe and put it in my 97 pick up. Now realistically it shouldn't work cause its not flashed for my truck. But it works in the truck even better then the one originally in it. Im still having no luck on the obd2 connecting. How hard is it to replace the obd2 harness. Thank yall

 

[99xcss4]

I do not know about changing the obd2 harness you may need to change the whole cab harness to do so also you can put any pcm from a 96 or a 97 in your truck as long as it is from a truck tahoe/yukon or suburban that has a 350 and 4l60e 96-97 black box pcms 5 plugs have anti theft 98+ black box pcms 4 plugs have VATS/paslock you can not use one of these with out having the anti theft disabled by tuning and you will need to re-pin the harness I think that is why when people want to swap pcms in a 96 or 97 they skip the 98+ black box and go right to the 0411 swap

 

[k1500 97]

I do not know about changing the obd2 harness you may need to change the whole cab harness to do so also you can put any pcm from a 96 or a 97 in your truck as long as it is from a truck tahoe/yukon or suburban that has a 350 and 4l60e 96-97 black box pcms 5 plugs have anti theft 98+ black box pcms 4 plugs have VATS/paslock you can not use one of these with out having the anti theft disabled by tuning and you will need to re-pin the harness I think that is why when people want to swap pcms in a 96 or 97 they skip the 98+ black box and go right to the 0411 swap

Oh ok. I really dont wanna do a cab harness swap. I really dont have the knowledge either im 16 just about out of highschool. Only vehicle i have so i cant park it to work on it. Its for sure a daily driver. Its moving every day.. idk saving for another truck so we will see the outcome.

 

[99xcss4]

yeah changing a cab harness is not simple I think I am going to have to do it on frank'n truck I was only speculating you might be able to change obd2 part with out changing the whole cab/under dash harness hopefully one of the more experienced members will chime in

 

[k1500 97]

yeah changing a cab harness is not simple I think I am going to have to do it on frank'n truck I was only speculating you might be able to change obd2 part with out changing the whole cab/under dash harness hopefully one of the more experienced members will chime in

Yea cause the port has power i think its between the ecm and the port thats messed up somewhere. But for me harnesses are like staring into the human brain.

 

[99xcss4]

agree there 90s and older is not too bad but once you get into the 2000s+ I do not understand it at all

 

[Schurkey]

the port has power

Has power. Does it have ground on both pin 4 and 5?
www.makeuseof.com/tag/obd-ii-port-used/

What Is the OBD-II Port and What Is It Used For?

If you purchased a car built after 1996, it probably has an OBD-II port. But what is it for, and how do you diagnose errors with it?

www.makeuseof.com