ISAT, the Intelligent Saab Tester, is an earlier Saab diagnostic instrument. Saab's 1995 service manual for the 900 and 9000 describes fault-code diagnosis, measurement functions and software updates. It describes ISAT II as an updated, functionally compatible version of ISAT. Saab 900/9000 ISAT service manual, 1995.
Adapters and transition
Saab describes the SDA II diagnostic adapter and ISAT-SIM interface module as accessories for particular communications and measurement tasks. Their presence and capability depend on the instrument and procedure; they are not the same as the later GM Tech 2. Saab ISAT manual.
A January 1997 Saab bulletin discusses both ISAT status and Tech 2 coverage for 1994–1997 Saab 900 and 9000 systems, including specific exceptions. The overlap means that a blanket claim that all vehicles from one particular model year use only one of the tools would be misleading. Saab Tech 2 compatibility and ISAT status bulletin. See Saab diagnostic systems.