Answer :
Final answer:
The EVAP system is tested for leaks using the Leak Detection Pump or EVAP System Leak Test where a vacuum or pressure is applied to the system and responses are monitored. A slow change in pressure indicates a small leak, while a quick change suggests a gross leak. An EVAP monitor is used in OBD II vehicles to log any malfunctions.
Explanation:
The EVAP system is tested for small and gross leaks through a process known as the Leak Detection Pump (LDP) test or EVAP System Leak Test. This test involves the system applying a vacuum or pressure to the system and monitoring the response.
If the pressure drops or rises beyond an acceptable level, it signifies a leak in the system. For instance, a small leak will allow the pressure to change slowly, while a gross leak will cause a quick change in pressure. On OBD II (On-Board Diagnostics II) vehicles, a special EVAP monitor observes and logs any malfunctions in the system.
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