Logical electronic diagnosis, old school, beyond the scan-tool

[Ace-Garageguy]

Scan tools are usually necessary to diagnose and repair today's cars that rely heavily on electronics. But the scan-tool can only tell you so much. Old-school knowledge and skills are often required to get to the root cause of a problem, and not all "technicians" have them.

This car was torn apart by a chimp who just didn't understand the basics, and was repaired by someone who did.