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Not sure where your information has come from regarding "diagnostic technique" as attach below Giallo's up to date news information from their website regarding the latest diagnostic equipment available from Maserati
"Latest
Maserati Tester
New Maserati System Diagnostic Tester
We are lucky and proud to annouce we have purchased the new Maserati System Diagnosi Tester. This new tester was only made available to the independent market in May this year and we have become the first company to receive it, in Europe possibly, and activate it. Being laptop based and using blue tooth, this equipment now gives us the facility to carry extensive diagnostic tests on Maserati vehicles. The range is from old Quattroporte to current Gran Turismo and includes Ghibli, 3200GT and 4200GT and Gransport. With the function facility we can operate items independent of the vehicle controls, which aids repairs and diagnostics. This equipment also gets updated weekly and this is to ensure any programming and procedures to be adhered to are up to date. Included in the kit is an oscilloscope that helps monitor faulty components, this displays a digital signal on the laptop for us to check and compare to a good signal. An oscilloscope will also be used to check clutch balance values, driveshaft balance and engine compressions."