We’ll examine the elimination of a few of the system’s earlier trouble-areas, explain how to read and understand the built-in fault-codes and explore some of the more common problems with the later systems.
As the carmakers include more features and new kinds of driveability and emissions controls into their cars, scanner manufacturers have to follow the lead of the carmakers and make their tools fit the cars on the road.
While the four-valve cylinder does have the advantages of high rpm for racing and other high-speed purposes, that’s not what they’re for in most of the ordinary cars we see in the shop.
In important and unexpected ways, the information in wiring diagrams is our most valuable diagnostic tool; so most good mechanics use them frequently for just such troubleshooting.