DTC SUMMARY
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
P045500 | Evaporative Emission System Leak Detected (Large Leak) | Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at start and end of leak check. If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak. |
| Comes on | DTC stored | SAE Code: P0455 |
P045600 | Evaporative Emission System Leak Detected (Very Small Leak) | Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure measured at start and end of leak check. If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak. |
| Comes on | DTC stored | SAE Code: P0456 |
DTC No. | Monitoring Item | Detection Timing | Detection Logic | SAE |
---|---|---|---|---|
P045500 | EVAP gross leak | EVAP monitoring (engine switch off) | 2 trip | P0455 |
P045600 | EVAP small leak | P0456 |
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System.
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MONITOR DESCRIPTION
5 hours* after the engine switch is turned off, the leak detection 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:
*: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not less than 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.
Sequence | Operation | Description | Duration |
---|---|---|---|
- | ECM activation | Activated by soak timer 5, 7 or 9.5 hours after engine switch turned off. | - |
A | Atmospheric pressure measurement | Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 to 110 kPa(abs) [10.15 to 15.95 psi(abs)], ECM cancels EVAP system monitor. | 60 seconds |
B | First reference pressure measurement | In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally. | 360 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 is 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* |
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 reference pressure measurement | After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements. If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system is leaking. | 60 seconds |
- | Final check | Atmospheric pressure is measured and then monitoring result is recorded by ECM. | - |
*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
*1 | Purge VSV: Off (Closed) | *2 | Purge VSV: On (Open) |
*3 | Vent Valve: Off (Vent) | *4 | Vent Valve: On (Closed) |
*5 | Leak Detection Pump: Off | *6 | Leak Detection Pump: On |
*7 | Reference Orifice (0.02 inch) | *8 | Canister Pressure Sensor |
*9 | Canister | *10 | Fuel Tank |
*11 | Canister Pump Module | *12 | Canister Filter |
*a | Operation A: Atmospheric Pressure Measurement | *b | Operation B, E: Reference Pressure Measurement |
*c | Operation C: EVAP System Pressure Measurement | *d | Operation D: Purge VSV Monitor |
*e | Atmospheric Pressure | *f | Negative Pressure |
In operation C, the leak detection 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 reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leak, illuminates the MIL and stores this DTC (2 trip detection logic).
In operation C, the leak detection 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 reference pressure, the ECM determines that the EVAP system has a small leak, illuminates the MIL and stores this DTC (2 trip detection logic).
MONITOR STRATEGY
Required Sensors/Components (Main) | Purge VSV Canister pump module |
Required Sensors/Components (Related) | - |
Frequency of Operation | Once per driving cycle |
Duration | Within 20 minutes (varies with amount of fuel in tank) |
MIL Operation | 2 driving cycles |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Atmospheric pressure | 70 kPa(abs) [10.15 psi(abs)] or higher, and less than 110 kPa(abs) [15.95 psi(abs)] |
Battery voltage | 10.5 V or higher |
Vehicle speed | Less than 4 km/h (2.5 mph) |
Engine switch | Off |
Time after key-off | 5, 7 or 9.5 hours |
Canister pressure sensor malfunction (P0452, 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 met before-key off | 1 and 2 |
1. Duration that vehicle is driven | 5 minutes or more |
2. EVAP purge operation | Performed |
Engine coolant temperature | 4.4°C (40°F) or higher, and less than 35°C (95°F) |
Intake air temperature | 4.4°C (40°F) or higher, and less than 35°C (95°F) |
TYPICAL MALFUNCTION THRESHOLDS
P0455: EVAP Gross Leak EVAP pressure when vacuum introduction is complete | Higher than [reference pressure x 0.2] |
EVAP pressure when vacuum introduction is complete | Between reference pressure and [reference pressure x 0.2] |
MONITOR RESULT
Refer to EVAP system.
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CONFIRMATION DRIVING PATTERN
NOTICE:
HINT:
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Techstream Display | Description |
---|---|
NORMAL |
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ABNORMAL |
|
INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
PROCEDURE
1. | GO TO EVAP SYSTEM |
(a) Refer to EVAP System.
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NEXT | END |