Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

P2450: FUEL VAPOR-CONTAINMENT VALVE STUCK OPEN

Either of the following conditions is met when fuel tank pressure is higher than -2 kPa(gauge) [-0.29 psi(gauge)], and less than 3 kPa(gauge) [0.44 psi(gauge)]	Condition 1 or 2
1. Fuel tank pressure change when vacuum introduction for canister	Higher than 0.5 kPa(gauge) [0.07 psi(gauge)]
2. Canister pressure when vacuum introduction for canister was complete	Higher than [third reference pressure x 0.2]

P2451: FUEL VAPOR-CONTAINMENT VALVE STUCK CLOSE

Either of the following conditions is met	Condition 1 or 2
1. Both of the conditions below are met	Condition (a) and (b)
(a) Fuel tank pressure	Higher than -2 kPa(gauge) [-0.29 psi(gauge)], and less than 3 kPa(gauge) [0.44 psi(gauge)]
(b) Fuel tank pressure change when vacuum introduction for fuel tank	Less than 0.5 kPa(gauge) [0.07 psi(gauge)]
2. Both of the conditions below are met	Condition (a) and (b)
(a) Fuel tank pressure	-2 kPa(gauge) [-0.29 psi(gauge)] or less, or 3 kPa(gauge) [0.44 psi(gauge)] or higher
(b) Canister pressure change when fuel vapor-containment valve is open	Less than 0.9 kPa(gauge) [0.13 psi(gauge)]