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 EVAP (Evaporative Emission) System (See page
).
MONITOR DESCRIPTION
5 hours* after the ignition 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 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 |
Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch is 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 kPa(abs) and 110 kPa(abs) [525 mmHg(abs) and 825 mmHg(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 then EVAP system pressure is measured. Write down measured value as they 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 there is a leak in EVAP system. |
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 |
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 7 minutes (varies with amount of fuel in tank) |
MIL Operation |
2 driving cycles |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored |
None |
Atmospheric pressure |
70 kPa(abs) [525 mmHg(abs)] or higher, and less than 110 kPa(abs) [825 mmHg(abs)] |
Battery voltage |
10.5 V or higher |
Vehicle speed |
Less than 4 km/h (2.5 mph) |
Ignition 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 |
Conditions 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
EVAP pressure change after EVAP canister vent valve on |
Less than 0.3 kPa(gauge) [2.25 mmHg(gauge)] |
MONITOR RESULT
Refer to Checking Monitor Status (See page
).
CONFIRMATION DRIVING PATTERN
NOTICE:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
PROCEDURE
1. |
REFER TO THE EVAP SYSTEM |
Refer to EVAP System (See page ).
NEXT | ![]() |
END |
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