Final answer:
A technician will use a scan tool to retrieve trouble codes for a four-wheel drive electronic component and then use a multimeter or specialized diagnostic equipment to diagnose and interpret these codes.
Step-by-step explanation:
When testing a four-wheel drive electronic component, the technician will use a scan tool to pull codes, and then a multimeter or sometimes more specialized diagnostic equipment to diagnose any codes found. The scan tool is used to read trouble codes from the computer inside the vehicle which could indicate where potential problems lie.
However, interpreting these trouble codes and pinpointing the exact issue often requires further troubleshooting with tools like a multimeter, which can measure voltage, current, and resistance. These measurements help the technician figure out if electrical components are functioning within the required specifications. It's essential for the technician to have a solid understanding of the vehicle's electrical system to correctly interpret the readings from the multimeter and make the appropriate repairs.