P2419

3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2419: Evaporative Emission System Switching Valve Control Circuit Low

DTC P2419 - Evaporative Emission System Switching Valve Control Circuit Low

DTC P2420 - Evaporative Emission System Switching Valve Control Circuit High

DTC SUMMARY





DESCRIPTION

Refer to the EVAP system EVAP System.

MONITOR DESCRIPTION

1 P2419: Vent valve stuck closed
In operation B, the vacuum pump creates negative pressure (vacuum) through the 0.02 inch orifice. The EVAP (Evaporative Emission) system pressure is then measured by the ECM (included in the HV control ECU) using the pressure sensor to determine the 0.02 inch leak pressure standard. If the pressure exceeds -1.06 kPa (-7.95 mmHg)* 4 seconds after the vacuum pump is turned ON, the ECM interprets this as the vent valve being stuck closed. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
*: The threshold varies according to the atmospheric pressure measured in operation A. The value described above is based on an atmospheric pressure of 100 kPa (750.1 mmHg): absolute pressure.
2 P2420: Vent valve stuck open (vent)
In operation C, the vent valve turns ON (closes) and the EVAP (Evaporative Emission) system pressure is then measured by the ECM (included in the HV control ECU) using the pressure sensor to conduct an EVAP leak check. If pressure does not increase when the vent valve is open, 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. 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 P2419: Vent valve stuck closed






2 P2420: Vent valve stuck open (vent)






MONITOR RESULT

Refer to the EVAP system EVAP System.

INSPECTION PROCEDURE

Refer to the EVAP system EVAP System.