So if you believe as I do you must conclude that every self contained scan tool since then is a clone. The Monitor 85 was a co-operative joint venture between GM electrical engineers and OTC. So now was the MPSI the first and original scan tool or was the Monitor 85? I believe the OTC Monitor 85 was as it was extremely advanced over the primitive MPSI. This new system was so advanced over the old system that GM opted to change tool manufacturer relationships and the Otawanna Tool Company (OTC) Monitor 85 with better and more complete parameter selections was introduced and became the new dealer required essential tool. This was later renamed the Assembly Line Communications Link or (ALCL) and it was included in every vehicle until the 1995 model year. The next model year GM introduced the Assembly Line Diagnostics Link (ALDL) 12 pin connector.
The required dealer essential tool was a scan tool from MPSI, with a rotating switch to view different parameters on a single line LED readout. That system had a very simple 5 pin molded connector under the dash. In 1980 GM introduced its first onboard diagnostics system, capable of easily transmitting data. Let’s use some history of scan tools as they were introduced by General Motors through the dealer service tool channel, since they were one of the early adopters of onboard diagnostics. Sometimes this is easy to decide other times it is extremely vague. I personally define a “clone tool” as one that was not the original. Let us examine what a clone scan tool is and see if it really makes a difference. In this article we will cover clones and in a future article I will offer some suggestions for novices. After the article “ Scan Tools Which One Is Right For You” was posted on our site we received a lot of questions about “Clone” scan tools and many novices wanted to know how they should choose a tool and what accessories they should have.
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