In the earliest US models (1990 model year), the diagnostic system covers the engine and automatic transmission, as well as the airbags. However, the airbags have their own connector located directly near the airbag control unit. In the future, I would like to see that the Climatronic and ABS systems are also capable of being diagnosed.
However, this is the wrong forum for this question, as the V8 was a gasoline engine.