Brand:
Toyota
Model Name:
4Runner GRN210 215 UZN210 215
Manual:
Repair Manual
Section:
1Gr-Fe Engine Control System
Title:
Sfi System
DTC P0455 Evaporative Emission Control System Leak Detected (Gross Leak)
DTC P0456 Evaporative Emission Control System Leak Detected (Very Small Leak)
DTC SUMMARY
| DTCs | Monitoring Items | Malfunction Detection Conditions | Trouble Areas | Detection Timings | Detection Logic |
| P0455 | EVAP gross leak | Vacuum pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. The 0.02 inch leak pressure standard is measured at the start and end of the leak check. If stabilized pressure is higher than [second 0.02 inch leak pressure standard x 0.2], ECM determines that EVAP system has large leakage. |
| While ignition switch OFF | 2 trip |
| P0456 | EVAP small leak | Vacuum pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. The 0.02 inch leak pressure standard measured at the start and end of the leak check. If stabilized pressure is higher than second 0.02 inch leak pressure standard, ECM determines that EVAP system has small leakage. | Same above | While ignition switch OFF | 2 trip |
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (Click here).INSPECTION PROCEDURE
Refer to the EVAP 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 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 in the fuel tank, it take longer for the EVAP pressure to stabilize.
![P0455: EVAP (Evaporative Emission) gross leakIn operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pressure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leakage, illuminates the MIL and sets the DTC (2 trip detection logic). 4Runner](/sites/default/files/4runner_grn210_215_uzn210_215/a096746e18.png)
- P0455: EVAP (Evaporative Emission) gross leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pressure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leakage, illuminates the MIL and sets the DTC (2 trip detection logic). - P0456: EVAP very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak pressure standard, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
MONITOR STRATEGY
| Related DTCs | P0455: Gross leak detected P0456: Very small leak (0.020 inch hole) detected |
| Required Sensors / Components | Purge VSV, pump module |
| Frequency of Operation | Once per driving cycle |
| Duration | Within 15 minutes (varies with amount of fuel in tank) |
| MIL Operation | 2 driving cycles |
| Sequence of 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 sensor 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 and 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 (-36.384 to -7.929 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
| EVAP pressure when vacuum introduction is complete | Between reference pressure and reference pressure x 0.2 |
| EVAP pressure when vacuum introduction is complete | Higher than reference pressure x 0.2 |