Obdx Pro Template (my own Tool)

[modzer321]

aldl on a v6 commodore usig OBDX Pro gt

[Tazzi]

Ok, so what is the ALDL command to read the VIN? And on what vehicle?

Every single GM ECU that supports ALDL will support different commands, it differs between them all.

Its not like a GM CAN command where all ECUs respond to the same commands.

[modzer321]

vy and vz ecu

[antus]

what you'll need to do it run something that can monitor an ALDL bus, and use tech2win or a hardware scan tool that can pull the vin from the computer and log the ALDL. Then look at that and convert the hex to ascii and find the request or requests for the vin. Then write a tool to replay the request and rebuild the vin. In OBD2 it's 3 requests. In ALDL it might be in 1 since most ALDL requests are longer, but could still be 3. It'll be interesting to see how close to OBD2 it is, as ALDL on those models is often called OBD 1.5 even though that is not an official designation, but a lot of the packet format did end up in OBD2, and GM was producing OBD2 cars at the same time as this older generation of ECU was still in production around the turn of the century.

[modzer321]

nothing can monitor this