P2420

2GR-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

HINT
The vent valve is built into the canister pump module.

DESCRIPTION

The circuit description can be found in the EVAP (evaporative emission) System Component Tests and General Diagnostics.

INSPECTION PROCEDURE

Refer to the 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, 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

Key-off monitor sequence 1 to 15

1. Atmospheric pressure measurement

2. First reference pressure measurement

3. Vent valve close stuck check

4. Vacuum introduction for canister

5. Purge VSV stuck closed check

6. Second reference pressure measurement

7. Canister leak check

8. Fuel tank closed valve (TCV) stuck closed check

9. Vacuum introduction for fuel tank

10. TCV stuck closed check

11. Fuel tank pressure sensor stuck check

12 Third reference pressure measurement

13. Fuel tank leak check

14. Fuel tank pressure sensor stuck check

15. Atmospheric pressure measurement

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

CONFIRMATION DRIVING PATTERN

NOTICE:
* The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
* Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
* Do not run the engine during this operation.
* When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the ignition switch off.

5. Turn the ignition switch to ON and turn the Techstream on.

6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode [A].

7. After the Evaporative System Check is completed, check for DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

8. Read the Pending DTC [B].

HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.

9. After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

10. Input the DTC: P2420.

11. Check the DTC judgment result [B].

HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or UNKNOWN, perform step [A] again.

12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

13. Check the judgment result.

HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.

14. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.