P2420

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420: Evaporative Emission System Switching Valve Control Circuit High
P2420 - Evaporative Emission System Switching Valve Control Circuit High

DTC SUMMARY





DESCRIPTION

The description can be found in EVAP (Evaporative Emission) System Component Tests and General Diagnostics.

INSPECTION PROCEDURE

Refer to EVAP System Component Tests and General Diagnostics.

MONITOR DESCRIPTION

Vent valve stuck open (vent)

In operation C, the vent valve turns ON (closes) and the EVAP system pressure is then measured by the ECM (included in the hybrid vehicle control ECU), using the canister pressure sensor, to conduct an EVAP leak check. If the pressure does not increase when the vent valve is opened, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and sets the DTC.





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. 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





TYPICAL MALFUNCTION THRESHOLDS

Vent valve stuck closed





MONITOR RESULT

Refer to CHECKING MONITOR STATUS Mode 6 Data.