Jeff Taylor boasts a 34-year career in the automotive industry with Eccles Auto Service in Dundas, Ontario, as a fully licensed professional lead technician. While continuing to be “on the bench” every day, Jeff is also heavily involved in government focus groups, serves as an accomplished technical writer and has competed in international diagnostic competitions as well as providing his expertise as an automotive technical instructor for a major aftermarket parts retailer.
Many technicians start to feel uncomfortable about a diagnostic situation if the scanner only shows U-codes, but if the scanner powers up but will not communicate, that uncomfortable feeling intensifies.
Today’s modern ignition system normally will use a single ignition coil per cylinder, mounted directly or very close to the spark plug: the Coil On Plug (COP) design. Some systems use an individual coil and a small ignition wire in a Coil Near Plug (CNP) setup because the location of the spark plug in the cylinder head won’t allow enough room to directly mount a coil on the spark plug, I consider this a version of COP.
Automotive technicians all have their own individual style and approach to diagnostics and education. But most techs will tell you that if they understand how the system is supposed to work and the components involved, the diagnostic repair journey is usually easier. Automotive technology is constantly changing, it never seems to stop, but keeping up with this constant change is a demanding task.
Diagnostics can seem tricky and daunting at times. Just the sight of a “U” based code can be intimidating to even the best diagnostic technicians, but if a U0028:00 MOST bus code is set and you are dealing with the complaint of no center stack or no radio operation on a GM car or truck, where do you even start and what the heck is the MOST bus?