Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141
TYPICAL MALFUNCTION THRESHOLDS
DTC P2420 Evaporative Emission System Switching Valve Control Circuit High |
DTC SUMMARY
| DTC No. | Monitoring Item | Malfunction Detection Condition | Trouble Area | Detection Timing | Detection Logic |
| P2420 | Vent valve stuck open (vent) | Following condition met during key-off EVAP monitor:
|
| While ignition switch off | 2 trip |
- HINT:
- The vent valve is built into the canister pump module.
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System (COROLLA_ZRE142 RM0000011IO03GX_07.html).MONITOR DESCRIPTION
5 hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.- HINT:
- *: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.
| Sequence | Operation | Description | Duration |
| - | ECM activation | The key-off monitor is activated by soak timer 5, 7 or 9.5 hours after ignition switch turned off. | - |
| A | Atmospheric pressure measurement | Vent valve is turned OFF (vent) and the EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 kPa(abs) and 110 kPa(abs) [525 mmHg(abs) and 825 mmHg(abs)], the ECM cancels EVAP system monitor. | 60 seconds |
| B | First reference pressure measurement | In order to determine reference pressure, the leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if the leak detection pump and vent valve operate normally. | 60 seconds |
| C | EVAP system pressure measurement | Vent valve turned ON (closed) to shut the EVAP system. Negative pressure (vacuum) created in the EVAP system, and EVAP system pressure then measured. The measured value is memorized as it will be used in the leak check. If the EVAP pressure does not stabilize within 15 minutes, the ECM cancels EVAP system monitor. | 15 minutes* |
| D | Purge VSV monitor | Purge VSV is opened and then the EVAP system pressure is measured by the ECM. A large increase indicates normality. | 10 seconds |
| E | Second reference pressure measurement | After a second reference pressure measurement, the leak check is performed by comparing the first and second reference pressure. If stabilized system pressure is higher than second the reference pressure, the ECM determines that the EVAP system is leaking. | 60 seconds |
| - | Final check | Atmospheric pressure is measured and then the monitor result is recorded by the ECM. | - |
P2420: Vent valve stuck open (vent)
In operation C, the vent valve turns on (closed) 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 open, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
| Required Sensors/Components | Purge VSV and canister pump module |
| Frequency of Operation | Once per driving cycle |
| Duration | Within 3 minutes (varies with amount of fuel in tank) |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever following DTCs are not present | None |
| Atmospheric pressure | 70 kPa(abs) [525 mmHg(abs)] or more, and less than 110 kPa(abs) [825 mmHg(abs)] |
| Battery voltage | 10.5 V or more |
| Vehicle speed | Below 2.5 mph (4 km/h) |
| Ignition switch | Off |
| Time after key off | 5, 7 or 9.5 hours |
| Canister pressure sensor malfunction (P0452 and P0453) | Not detected |
| Purge VSV | Not operated by scan tool |
| Vent valve | Not operated by scan tool |
| Leak detection pump | Not operated by scan tool |
| Both of following conditions are met before key off | Conditions 1 and 2 |
| 1. Duration that vehicle has been driven | 5 minutes or more |
| 2. EVAP purge operation | Performed |
| Engine coolant temperature | 4.4°C (40°F) or more, and less than 35°C (95°F) |
| Intake air temperature | 4.4°C (40°F) or more, and less than 35°C (95°F) |
TYPICAL MALFUNCTION THRESHOLDS
| EVAP pressure change after EVAP canister vent valve ON | Less than 0.3 kPa(gauge) [2.25 mmHg(gauge)] |
CONFIRMATION DRIVING PATTERN
- NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 6 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 higher 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).
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
- After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P2420.
- Check the DTC judgment result.
Techstream Display Description NORMAL - DTC judgment completed
- System normal
ABNORMAL - DTC judgment completed
- System abnormal
INCOMPLETE - DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
- HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- DTC judgment completed
- If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).
- HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.