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How are EVAP system leaks detected by the ECU?

I am curious which sensor(s) detects an EVAP leak and throw error codes, for example: P0442 - EVAP System Leak Detected (small leak) P0455 - EVAP System Leak Detected (large leak) My car is a 2003 ...
6
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1answer
601 views

Check engine light with code P0455 comes on when fuel tank is below 3/4 full

In my 2001 Mazda Miata, the check engine light comes on when the fuel tank is at the 3/4 full mark. The code is DTC P0455 - Evap System Large Leak Detected I have replaced the fuel cap already. What ...