No ALDL connection with 93 LT1 $DA3

[orr89rocz]

Wondering if the ecm is bad at the pin or somewhere else internally? Or if the adx file on this site needs edited to work? I have searched around and it seems there can be issues connecting to these computers.

Car is a 93 fbody lt1. Has mild cam and full exhaust so it needs a tune. It did have a hypertech stage 2 chip in it and did seem to run ok but rich at cold start. I was able to burn a chip using a slightly modified bin from the $DA3 thread here, i believe a BDZL bin. Car runs on it so ecm seems fine but i cannot get the aldl to work to log using tunerpro rt and moates cable.

first off this isnt my first time, i have tuned many tpi cars, some tbi trucks and other 94-95 lt1’s as well as 96-97’s using jet dst. My cable connects fine to other cars. I have a spare tpi 730 ecm here i hooked to battery and connected fine to verify my cable works last night.

we tested the aldl port wiring all way to ecm connector and it is fine. I pulled ecm and put it on the bench with battery connected to the power and ground pins and pinned my cable to the aldl stream pin. Tried everything i could and nothing connects. I let it try the $da3 adx for 5 min and never gets thru. I tried tunerpro version 4 with a $da2 ads and nothing.

what else can i do? Thanks

[NomakeWan]

Have you tried running DataCat, even as a trial version, to see if it would connect successfully? That'd be my first thought, if you don't have another scan tool around to test connectivity with.

[orr89rocz]

I just downloaded and attempted. Never used this before so browsed thru it for 15 min and i think i set it up right and tried to connect but i dont think it did. I tried grabbing dtc using the get dtc operation and it said operation failed. So i dont think it worked either

[NomakeWan]

That points to a problem with this particular car, unfortunately. DataCat should absolutely connect to a $DA3 or $DA2 car without any issues. If it's not the program and it's not the cable, there's something up with this particular car. Unfortunately as I don't personally own a $DA2 or $DA3 car I can't help with any more in-depth diagnostics.

[orr89rocz]

I’ll try it again to be sure but the ecm is out of the car right now on my table with power and grounds connected. Nothing with the car is associated with this so its an ecm problem if not any of my doing with this DataCat or tunerpro rt

[WASyL]

had same issues with DA2/DA3 ECM's, even Snap-on and Tech2 had issues. It was swap engine. For me solution was to add extra grounds and fix issue with one ECM Ignition swithed +12V.

best regards