Brand:
Toyota
Model Name:
4Runner GRN210 215 UZN210 215
Manual:
Repair Manual
Section:
1Gr-Fe Engine Control System
Title:
Sfi System
DTC P2419 Evaporative Emission System Switching Valve Control Circuit Low
DTC P2420 Evaporative Emission System Switching Valve Control Circuit High
DTC SUMMARY
| DTCs | Monitoring Items | Malfunction Detection Conditions | Trouble Areas | Detection Timings | Detection Logic |
| P2419 | Vent valve stuck closed | Vacuum pump creates negative pressure through 0.02 inch orifice and EVAP system pressure measured to determine leak pressure standard. If system pressure is higher than -1.06 kPa (-7.95 mmHg)* 4 seconds after vacuum pump turned ON, ECM determines that vent valve is stuck closed. |
| While ignition switch OFF | 2 trip |
| P2420 | Vent valve stuck open (vent) | Vacuum pump creates negative pressure through 0.02 inch orifice and EVAP system pressure measured to determine leak pressure standard. 0.02 inch leak pressure standard measured at start and at end of leak check. If system pressure does not increase by more than 0.3 kPa (2.25 mmHg) within 10 seconds when vent valve turned ON, ECM determines that vent valve is stuck closed. |
| While ignition switch OFF | 2 trip |
- HINT:
- The vent valve is built into the pump module.
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (Click here).INSPECTION PROCEDURE
Refer to the EVAP (Evaporative Emission) System (Click here).MONITOR DESCRIPTION
5 hours*1 after the ignition switch is turned off, the electric vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.- HINT:
- *1: If the engine coolant temperature is not below 35°C (95°F) after 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 | Operations | Descriptions | Duration |
| - | ECM activation | Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned off. | - |
| A | Atmospheric pressure measurement | Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 kPa and 110 kPa (525 mmHg and 825 mmHg), ECM cancels EVAP system monitor. | 10 seconds |
| B | First 0.02 inch leak pressure measurement | In order to determine 0.02 inch leak pressure standard, vacuum pump creates negative pressure (vacuum) through 0.02 inch orifice and then ECM checks if vacuum pump and vent valve operate normally. | 60 seconds |
| C | EVAP system pressure measurement | Vent valve is turned ON (closed) to shut EVAP system. Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure then measured. Write down measured value as it will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor. | 15 minutes*2 |
| D | Purge VSV monitor | Purge VSV is opened and then EVAP system pressure is measured by ECM. Large increase indicates normal. | 10 seconds |
| E | Second 0.02 inch leak pressure measurement | After second 0.02 inch leak pressure measurement, leak check is performed by comparing first and second 0.02 inch leak pressure standards. If stabilized system pressure is higher than second 0.02 inch leak pressure standard, ECM determines that EVAP system leaking. | 60 seconds |
| F | Final check | Atmospheric pressure is measured and then monitoring result is recorded by ECM. | - |
- *2: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
- P2419: Vent valve stuck closed
In operation B, the vacuum pump creates negative pressure (a vacuum) through the 0.02 inch orifice. The EVAP (Evaporative Emission) system pressure is then measured by the ECM, 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.
- 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, using the 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 sets the DTC.
MONITOR STRATEGY
| Related DTCs | P2419: Vent valve stuck open P2420: Vent valve stuck closed |
| Required sensors / components | Vent valve |
| Frequency of operation | Once per driving cycle |
| Duration | P2419: 8 seconds P2420: 10 seconds |
| MIL operation | 2 driving cycles |
| Sequence operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever these DTCs are not present | None |
| Atmospheric pressure | 70 to 110 kPa (525 to 825 mmHg) |
| Battery voltage | 10.5 V or more |
| Vehicle speed | Less than 2.5 mph (4 km/h) |
| Ignition switch | OFF |
| Time after key off | 5 or 7 or 9.5 hours |
| EVAP pressure malfunction (P0450, P0452, P0453) | Not detected |
| EVAP canister purge valve | Not operated by scan tool |
| EVAP canister vent valve | Not operated by scan tool |
| EVAP leak detection pump | Not operated by scan tool |
| Both of the following conditions are met before key off | Condition 1 or 2 |
| 1. Duration that vehicle has been driven | 5 minutes or more |
| 2. EVAP purge operation | Performed |
| ECT | 4.4 to 35°C (40 to 95°F) |
| IAT | 4.4 to 35°C (40 to 95°F) |
Key-off monitor sequence 1 to 8
1. Atmospheric pressure measurement Next sequence is run if the following condition is set - Atmospheric pressure change within 0.3 kPa (2.25 mmHg) in 1 second 2. First reference pressure measurement Next sequence is run if the following conditions are set - EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less Reference pressure -4.85 to -1.057 kPa (-36.38 to -7.93 mmHg) Reference pressure Saturated 3. EVAP canister vent valve close stuck check Next sequence is run if the following condition is set - EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more 4. Vacuum introduction Next sequence is run if the following condition is set - EVAP pressure Saturated within 12 minutes 5. EVAP canister purge valve close stuck check Next sequence is run if the following condition is set - EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more 6. Second reference pressure measurement Next sequence is run if the following conditions are set - EVAP pressure just after reference pressure -1 kPa (-7.5 mmHg) or less Reference pressure -4.85 to -1.057 kPa (-36.38 to -7.93 mmHg) Reference pressure Saturated Difference between first reference pressure and second reference pressure Less than 0.7 kPa (5.25 mmHg) 7. Leak check Next sequence is run if the following condition is set - EVAP pressure when vacuum introduction is complete Lower than second reference pressure 8. Atmospheric pressure measurement EVAP monitor is complete if the following condition is set - Atmospheric pressure difference between sequence 1 and 8 Within 0.3 kPa (2.25 mmHg)
TYPICAL MALFUNCTION THRESHOLDS
| One of the following conditions is met | Condition 1, 2, 3, 4 or 5 |
| 1. EVAP pressure just after reference pressure measurement start | More than -1 kPa (-7.5 mmHg) |
| 2. Reference pressure | Less than -4.85 kPa (-36.38 mmHg) |
| 3. Reference pressure | -1.057 kPa (-7.93 mmHg) or more |
| 4. Reference pressure | Not saturated |
| 5. Difference between first reference pressure and second reference pressure | 0.7 kPa (5.25 mmHg) or more |
| EVAP pressure change after EVAP canister vent valve is ON | Less than 0.3 kPa (2.25 mmHg) |