New computer need guidance already bricked one

[Tody'shop]

Blindsquirrel and Edmond-11 has helped me on this car and just want to reach out and make sure i don't brick another pcm. I bricked my e38 on my 1980 camaro with a LS2 and a 4l80. I used everything from a 2007 corvette and bricked the last computer and want to make sure i do it right. I ordered a pcm from sparecm and they used my vin number and i just want to make sure i do everything right and not brick another pcm. I have a t42 tcm but not sure which car it came from. My quistion is what to do first and then is it ok to try and crank.

[gtstorey]

You need to explain what you are wanting to do, or at least link to your other threads as a reminder. These all blend together.

[Tody'shop]

Sorry about that, i need to disable the vats and the downstream 02's and get it started. How can i link the other thread?

[gtstorey]

Copy the link and paste;
https://forum.hptuners.com/showthrea...233#post763233

[Tody'shop]

https://forum.hptuners.com/showthrea...ol-need-advice

[Tody'shop]

https://forum.hptuners.com/showthrea...-and-need-help

Here are the two discussions we had and i did what Blindsquirrel said was best option and ordered a computer that was programmed to my vin. I just wanted to make sure i did everything in order and could use the t42 i had with the ecm i have. Also when i do the vats patch do i do it alone or do i do it when i kill the dtc's i need too or can i just write the old programm i was trying to use or do i need something entirely differant?

[Alvin]

The only way to brick them is try to WRITE Entire a calibration that wasn't arleady on the ECM. Since you got it pre programmed with a vin you should be good to go.

[gtstorey]

What I would do.

Read the new ECM. All changes should be made to the new read (after saving the new read in several locations). Make changes to the VATS and write entire the VATS by itself. Then change the dtc's with write calibration. If you have changes in your old file you want in the new file, make those changes in the new file and write calibration.

[Tody'shop]

Ok thats what i was thinking just wanted to make sure first. Been trying to get going for a few years now and done screwed up one computer and redone the harness 3 times not counting the tearing down of the vette and all the mechanical stuff that goes along with everything. I'm just double checking. Thanks for yalls insight and help.

[gtstorey]

In general, there doesn't seem to be a limit of how often you can write calibration or write entire to a ECM. I'm sure I wrote to my E69 many hundreds of times before I had to replace it because of a burned up o2 driver within it. So you can make changes gradually.

[TheMechanic]

I do a lot of SPS/Techline Connect programming on new, refurb'd, and junkyard ECM/PCM/BCM,ABS, etc. etc.
There are several OS updates that also REQUIRE updating the TCM. Just did an E38 on a pre runner that requires the OS for the TCM to be updated or mucho problemo.

[Tody'shop]

When i done the first read it took a few times and wouldn't complete the read so i unhooked the gmlan to the tcm and still timed out so i then unhooked the t42 from the transmission harness and still timed out. I then unhooked the 12 volts to it which also was a source for 2 pink wires and ot read complete pcm. So could it be the tcm needs another 12 volt source or the tcm is not liking the 07 vette stuff? I had some say any tcm and some say a t42 won't work so i'm not sure. I'm also wondering if thats what got the first pcm?

[Tody'shop]

Also i am assuming i will have to liscense the new pcm if that is correct can i do it alone and crank or add the tcm first and liscence together or does it matter?

[edcmat-l1]

It sounds to me like the ECM OS and the TCM OS don't get along. This is why I always try to get my customers to buy both from the same vehicle.

If you had a bench harness you could read the ECM separate from the TCM and possibly figure it out.

Do you have a service number for the TCM? Any chance you have an HPT read of it?

[blindsquirrel]

IIRC, it's like a 2013 T42 (4L60E) or something. The physical hardware is OK (all T42s can be programmed with any other T42 OS) but it's programmed with an OS that will not ever communicate with a 2007 ECM. The TCM will have to use an OS from something pre-2009.

That should not make it interfere with the ECM and talking to the DLC though. I suspect there are still CAN wiring errors somewhere in the harness.

[blindsquirrel]

Pick one and copy (or verify it matches)
GMLAN inline simplified.png GMLAN Y simplified.png

[Tody'shop]

Ok i just remembered that when i tried the escalade pcm i had too swap two wires on the gas pedal do you think that may have been the culprit? Everything i have read in this car except the bricked pcm i have unhooked the tcm to read. I think the 09 Impala read them together can't remember for sure though. So does the tcm need the same type SPS flash or can hp do the swap if its done seperatly? Here is the t42.Z28 T42 controller.hpt

[edcmat-l1]

Sounds like they both need to be SPS flashed together.

[Tody'shop]

ok I don't have a 120 ohm resister in my line. I know i need to add that then.

[Tody'shop]

Pick one and copy (or verify it matches)
GMLAN inline simplified.png GMLAN Y simplified.png

So i should have 240 ohms a the dtc if i'm reading this correctly? Or is it 60 ohms i get backwards on reading ohms.