MDI (TECH 3)
We’re now arguably beyond the realm of the home mechanic, simply because online communications have developed to the point GM can restrict you from using standalone, single-purchase equipment without the company getting a regular piece of your wallet. Like many software providers, GM now requires you to pay a subscription fee to access its programs, which are hosted remotely and accessed by plugging a Multiple Diagnostics Interface (MDI) with WiFi into your car before connecting the device into an internet-connected laptop.
The MDI hardware still has to be bought, but it’s pretty much useless without the subscription. “When combined with Global TIS, GDS2 and Tech2Win software, MDI provides full dealer-level diagnostic and programming abilities for all Vauxhalls covered by Tech 2, as well as those beyond the scope of the older unit. Astra J and Insignia, for example, run more sophisticated fuel management computers than the models before them. Both cars are covered by MDI,” confirms Marc.
Like Tech2, beware of Chinese knock-offs and their questionably assembled PCB boards, which have the ability to seriously damage your car. You have been warned!