Interpret diagnostic trouble codes (DTCs) and scan tool data related to the emissions control systems; determine the needed action.

Interpretation should include

• using a scan tool
• using diagnostic troubleshooting charts
• comparing test results to service materials and manufacturer guidelines.

Process/Skill Questions:

• What is the function of a charcoal canister?
• What is the function of a purge solenoid?
• How can data be saved while driving?