HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Sfi System: Evaporative Emission Pressure Switching Valve Stuck OFF (P2420)
DTC SUMMARY DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic P2420 Vent valve stuck open (vent) Following condition met during key-off EVAP monitor: EVAP pressure change when vent valve closed (ON) less than 0.3 kPa-g (2.25 mmHg-g) Canister pump m ...
