The connector is usually located under the dash on the drivers side of left-hand drive (LHD) vehicles, though this location was not standardized.ĭiagnostic Connector There were at least four different connectors used with ALDL. This system was only vaguely standardized and suffered from the fact that specifications for the communications link varied from one model to the next.ĪLDL was largely used by manufacturers for diagnostics at their dealerships and official maintenance facilities. Most of which can be found by a simple search on the internet. I have found this to be the case with some PCs or laptops which is why I use this design.

Or the power supply may be too noisy for stable communications. Most laptops running on battery power may not have enough internal power for the adapter. I use the one above personally and it works great on OBDI LT1, TBI, and TPI vehicles. NOTE: OBDII Vehicles are not currently supported by every editor. The ALDL cables start at 50 or you can build your own for less than 20. The best (in my opinion) You will also need an EPROM programmer andor UV eraser.įor those of you using the 94 and later LT1 engines with the flashable PCMs, you will only require software from TunerCat or LT1edit as well as an interface cable. To reprogram most GM OBD-1 chips, you will require appropriate tuning software. Should you be one of those hands-on type of people, or your powertrain is constantly changing or being upgraded, then doing your own programming would probably be the least-expensive alternative.īelow are a couple of links of good technical articles that explain the basics of tuning a vehicle computer as well as what special tools and equipment are required to do the job. If you dont plan on making any other changes to your vehicle, it would probably be less expensive to let someone program your computer or chip.

Aldl gm software reprogram