P2451

2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2450,P2451: Fuel Vapor-containment Valve Stuck Open
P2451 - Fuel Vapor-containment Valve Stuck Close

DTC SUMMARY





DESCRIPTION

Refer to the EVAP System EVAP System.

MONITOR DESCRIPTION

1. Fuel vapor-containment valve (FVCV) stuck open

During sequence C, the leak detection pump creates vacuum pressure in the EVAP system. If the pressure in the fuel tank drops, the ECM determines that the tank close valve is stuck open. The ECM then illuminates the MIL and sets the DTC. (This DTC is set according to 2 trip detection logic.)

2. Fuel vapor-containment valve (FVCV) stuck closed (vent)

During sequence G, the tank close 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 tank close valve is stuck closed. The ECM then illuminates the MIL and sets the DTC. (This DTC is set according to 2 trip detection logic.)

During sequence I, the tank close valve opens to allow atmospheric pressure into the fuel tank. If there is no change in fuel tank pressure, the ECM determines that the tank close valve is stuck closed. The ECM then illuminates the MIL and sets the DTC. (This DTC is set according to 2 trip detection logic.)





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





Key-off monitor sequence 1 to 15

1. Atmospheric pressure measurement





2. First reference pressure measurement





3. Vent valve stuck closed check





4. Vacuum introduction for canister





5. Purge VSV stuck closed check





6. Second reference pressure measurement





7. Canister leak





8. Fuel vapor-containment valve (FVCV stuck closed check)





9. Vacuum introduction for fuel tank





10. FVCV stuck closed check





11. FTP sensor stuck check





12 Third reference pressure measurement





13. Fuel tank leak check





14. FTP sensor stuck check





15. Atmospheric pressure measurement





HINT
"Saturated" indicates that the EVAP pressure change in less than 0.12 kPa (0.9 mmHg) in 30 seconds.

TYPICAL MALFUNCTION THRESHOLDS

1. P2450: Fuel vapor-containment valve stuck open





2. P2451: Fuel vapor-containment valve stuck close





MONITOR RESULT

Refer to the CHECKING MONITOR STATUS Mode 6 Data.

WIRING DIAGRAM

Refer to the EVAP System EVAP System.

INSPECTION PROCEDURE

Refer to the EVAP System EVAP System.