First, sorry for the late response. I've been busy designing and programming the system.
*sir bambino and gillian - thank you for the suggestion sir!
*sir nickriingen - I'm taking BS IT sir. Uhm, I'll try to do what you were suggesting since it is somehow difficult for me right now to have that kind of resources since I'm still an undergraduate student. For now, I'll just go for the common car problems that can occur in different cars regardless of their manufacturers/models.
*sir 4JGtootsie - yup I'll try. But for now, I'll just talk with a car technician, since what I'm developing is like an expert system already.
Anyways, here is a beta version of the system. For now, it does not have any troubleshoot function of the system that will ask the user some troubleshooting questions. The information are not yet complete and I guess you should expect bugs.
The system should work fine in s60/Java phones with CLDC-1.1 and MIDP-2.0 features with a 240x320 resolution. Tested on my N82.