Final answer:
A scan tool is typically used to aid in troubleshooting on vehicles with self-diagnostic systems.
Step-by-step explanation:
On most vehicles with self-diagnostic systems, you can connect a scan tool to the vehicle to aid in troubleshooting.
A scan tool is a handheld device that communicates with the vehicle's diagnostic system to retrieve and interpret error codes and data. It provides technicians with valuable information to identify and diagnose problems.
Using a scan tool can help pinpoint specific issues, saving time and effort in the troubleshooting process.