This is the sensor to detect the fuel tank leakage in way which it measures the differential pressure between inside and outside fuel tank.
Check to look that fuel level is over 15%. If not, this inspection is not available.
The vehicle must be in turn-on and at idle. Don't forget it.
Prepare a voltmeter and connect it to FTP pins as shown.
After 20 min. idling, inspect the voltage.
Max. 4.5 V, Min. 0.5 V
At idle, inspect that voltage fluctuates up to accelerate rpm up and down.
If voltage is not within spec as procedures, there is leakage and inspect the fuel tank and hoses toward canister and fuel neck. Then repair or replace relevant parts.