1994 Z28/M6

i just got my aldl cable in today, and have been tryin to read the pcm using datamaster. The error im getting is when i test comm its is saying the aldl adapter is working, but no PCM was detected.

ANyone have an idea what could be cuasing this, or what i need to do to figure this out??

 

Did you set up the correct COM port in Datamaster? The cable should have came with a CD that includes the USB drivers for the software that will emulate the USB port as COM3.

Also, the key needs to be in the ON position (assuming you know that already).

 

i downloaded the driver, yes the key was in the on positon, but im thinking i have a ground problem. do you know how many grounds there are by the icm/coil, i know there is a ground wire that goes to the frame right there but i only have one other wire going there but have seen a pic of the harness on shbox n theres 2 going to it

 

this is the picture i was looking at http://shbox.com/1/harness7.jpg

i just cant figure out what those grounds go to.

 

Grounds go to ground.

Seriously though, the two terminals bolt to the coil bracket stud.

 

i know they go to ground , other then the end that is phyiscal grounded, what is the wires going to

 

i only have 1 terminal (plus the ground strap that goes to the frame) that goes to that coil bracket stud, that picture shows 2 terminals im just trying to see what im missing

 

Which one are you missing? There is a single black wire ring terminal and a double terminal with tan and white.

 

I don't have my wiring schematics with me but I think the 94s have a single connector there. Rob would be able to tell you...

 

Two rings from the engine harness. One ring has a black wire for the ICM ground. The other ring has two tan/white wires that are PCM grounds. The other ground is the braided strap that goes to the LH frame rail.

 

ok i have one that has a black and two tanish/white wires together, plus one ring which is the strap, should i split up those three wires on the one ring?. so i would have one ring with black, and the other ring with the tan/white two wires?

 

No, it makes no difference.

 

ok i checked all the grounds and everything is good, i also checked for for continuity to rule out a bad wire between the diagnostic port and the pcm. now am i possiby doing something wrong with the software.

what i did was download datamaster, made sure i did the one for 1994 lt1 fbody. and then i downloaded the drvier for the usb. now when i try to connect to the pcm it still says the the usb is working but it can not detect a pcm.