Monitor Description

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

P2450: Fuel vapor-containment valve stuck open
During sequence C, the leak detection pump creates vacuum in the EVAP system. If the pressure in the fuel tank drops, the ECM determines that the fuel vapor-containment valve is stuck open. The ECM then illuminates the MIL and stores the DTC (2 trip detection logic).
P2451: Fuel vapor-containment valve stuck closed (vent)
During sequence I, the fuel vapor-containment valve opens to allow atmospheric pressure into the fuel tank. If there is no change in fuel tank pressure, the ECM determines that the fuel vapor-containment valve is stuck closed. The ECM then illuminates the MIL and stores the DTC (2 trip detection logic).

During sequence G, the fuel vapor-containment valve opens to allow vacuum pressure generated by the leak detection pump into the fuel tank. If the pressure in the fuel tank does not drop, the ECM determines that the fuel vapor-containment valve is stuck closed. The ECM then illuminates the MIL and stores the DTC (2 trip detection logic).

Fig 1: Fuel Vapor-containment Valve (1 Of 2)

Fig 2: Fuel Vapor-containment Valve (2 Of 2)