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
Example of restart time:
Key-off monitor sequence 1 to 15
1. Atmospheric pressure measurement
1. Atmospheric pressure measurement:
2. First reference pressure measurement
2. First reference pressure measurement:
3. Vent valve stuck closed check
3. Vent valve stuck closed check:
4. Vacuum introduction for canister
4. Vacuum introduction for canister:
5. Purge VSV stuck closed check
5. Purge VSV stuck closed check:
6. Second reference pressure measurement
6. Second reference pressure measurement:
7. Canister leak
7. Canister leak:
8. Fuel vapor-containment valve (FVCV stuck closed check)
8. Fuel vapor-containment valve (FVCV stuck closed check):
9. Vacuum introduction for fuel tank
9. Vacuum introduction for fuel tank:
10. FVCV stuck closed check
10. FVCV stuck closed check:
11. FTP sensor stuck check
11. FTP sensor stuck check:
12 Third reference pressure measurement
12 Third reference pressure measurement:
13. Fuel tank leak check
13. Fuel tank leak check:
14. FTP sensor stuck check
14. FTP sensor stuck check:
15. Atmospheric pressure measurement
15. Atmospheric pressure measurement:
TYPICAL MALFUNCTION THRESHOLDS
Vent valve stuck closed
Vent valve stuck closed:
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data.