What does a complete EVAP system test indicate?

A complete EVAP (Evaporative Emission Control System) test is designed primarily to assess the integrity of the system. This means checking for leaks and ensuring that all components are functioning as they should in order to contain fuel vapors and prevent them from entering the atmosphere. The test typically involves pressurizing the system and monitoring it for any drops in pressure, which would indicate a leak.

While fuel efficiency and emission levels are important aspects of vehicle performance and environmental impact, they are not the primary focus of an EVAP system test. Fuel efficiency is more directly related to how effectively an engine uses fuel, while emission levels can be influenced by multiple systems within a vehicle, not just the EVAP system. Thus, option A accurately reflects the main purpose of the complete EVAP system test, which is to verify that the system is intact and operational without leaks.