P2451

3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2450: Fuel Vapor-containment Valve Stuck Open

DTC P2450 - Fuel Vapor-containment Valve Stuck Open

DTC P2451 - Fuel Vapor-containment Valve Stuck Close

DTC SUMMARY





DESCRIPTION

Refer to the EVAP system EVAP System.

MONITOR DESCRIPTION

1 P2450: Fuel vapor-containment valve (FVCV) stuck open
During sequence C, the vacuum pump creates vacuum pressure in the EVAP system. If the pressure in the fuel tank drops, the ECM (Included in HV control ECU) 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 2trip detection logic.)
2 P2451: Fuel vapor-containment valve (FVCV) stuck closed (vent)
During sequence G, the tank close valve opens to allow vacuum pressure generated by the vacuum 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 2trip 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 (Included in HV control ECU) 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 2trip detection logic.)





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





Example of restart time





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. EVAP 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





TYPICAL MALFUNCTION THRESHOLDS

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa (2.14 mmHg) in 60 seconds.

1. P2450: Fuel vapor-containment valve stuck open





2. P2451: Fuel vapor-containment valve stuck close





MONITOR RESULT

Refer to the EVAP system EVAP System.

INSPECTION PROCEDURE

Refer to the EVAP system EVAP System.