this is the answer of
Interactive user screen appears
Details of car type are entered
Questions about engine problems are asked/on-board computer connected to
expert system
Answers to questions/engine problems are typed in
Inference engine searches
Searches the Knowledge base
using the Rules (base)
Suggested probabilities of faults are output
In the form of a report to the mechanic/on screen output
did u got it
tell me yes or no