QUESTION- How can I best prepare my senior/advanced students for post-secondary apprenticeships and college training with regards to electronic automobile systems diagnosis and repair?

RATIONALE- My own personal background is as an automotive technician. Most people call us mechanics. This is not a correct term. People in the trade know the difference between the two. We consider a person to be a mechanic when he is good at repairing and replacing parts and doing other basic tasks such as oil changes, tires, brake repairs, cooling system repairs, and some basic tune-up work. A person is considered to be a technician when he can diagnose problems. He must also have the ability to repair problems. We become mechanics first so this is a given for any automotive technician. Automobiles have become so complicated that you must have a good understanding of electrical systems and circuits, and even more important of electronic systems. Most components today have a module to monitor and control the system, even something as basic as lubrication (oil) systems. These systems now have oil life monitors for levels and pressure and oil use. They actually monitor how you drive, how far per trip, and even how you accelerate. To be successful and at the top of the game you must learn about these systems and how they control the cars’ performance, fuel economy, and pollution to the environment.
So from the previous paragraph you can get an idea of the difference between the two designations. In the working world the technician is at the top of the pay scale, and is in the most demand. You are in a position to dictate your own employment terms when you have learned and mastered these type of diagnostic skills. When I left my place of employment to become a teacher my boss searched for six months to replace me and finally gave up. He ended up hiring an apprentice. Five years have now passed and I have still not been replaced. There is a great need for technicians today.
I feel that if I can give my students a head start in this area that it will greatly help them to be successful and help them to move from OIL CHANGER to something more desirable in a much shorter timeframe. They will also have be better prepared when going to college for their training. I have seen apprentices struggle in the shop environment because of poor background training.
The regular curriculum does not focus on this type of training. At the same time I am constantly asked to check cars that have CHECK ENGINE, AIR BAG (SIR), and ABS lights on. I have the equipment to at least scan the car and have some idea of what is wrong. I also have information for most cars to attempt a repair. My big problem with this is that I have a policy in my Autoshop that goes like this- if the students can not be involved with the repair and service of customers autos then I will not accept the work. I see no value in booking work that only I can repair. I am now the teacher, not the student.
If I can successfully teach one or two of my seniors the basics of diagnosing and repairing electronic problems then this is all worth it to me. We are having a hard time keeping people in the auto repair trade and I feel that I would be doing my little part to help the trade, but mostly to have a positive and lasting effect on the students who intend to pursue this trade beyond their own garage at home.