DTC SUMMARY
DTC No. |
Monitoring Item |
Malfunction Detection Condition |
Trouble Area |
Detection Timing |
Detection Logic |
---|---|---|---|---|---|
P0441 |
Purge VSV (Vacuum Switching Valve) stuck open |
Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. Reference pressure is measured at start and at end of leak check. If stabilized pressure higher than [second reference pressure x 0.2], ECM determines that purge VSV stuck open. |
|
While ignition switch off |
2 trip |
Purge VSV stuck closed |
After EVAP leak check performed, purge VSV turned on (open), and atmospheric air introduced into EVAP system. Reference pressure is measured at start and at end of check. If pressure does not return to near atmospheric pressure, ECM determines that purge VSV stuck closed. |
|
While ignition switch off |
2 trip |
|
Purge flow |
While engine running, following conditions successively met:
|
|
While engine running |
2 trip |
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System (See page ).
MONITOR DESCRIPTION
The 2 monitors, Key-off and purge flow, are used to detect malfunctions relating to DTC P0441. The Key-off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours after the ignition switch is turned off. The purge flow monitor runs while the engine is running.
5 hours* after the ignition switch is turned off, the electric 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, 7 or 9.5 hours after ignition 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 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 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 opened and then EVAP system pressure is measured by ECM. A large increase indicates normality. |
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 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.
Text in Illustration
*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 (Evaporative Emission) system. The EVAP system pressure is then measured by the ECM using the canister pressure sensor. If the stabilized system pressure is higher than [second reference pressure x 0.2], the ECM interprets this as the purge VSV being stuck open. The ECM illuminates the MIL and stores the DTC (2 trip detection logic).
In operation D, the canister pressure sensor measures the EVAP (Evaporative Emission) system pressure. The pressure measurement for the purge VSV monitor begins when the purge VSV is turned on (open) after the EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher, the purge VSV is functioning normally. If the pressure does not increase, the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and stores the DTC (2 trip detection logic).
The purge flow monitor consists of 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.
While the engine is running and the purge VSV is on (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.
The vent valve is turned on (closed) and the EVAP pressure is then measured. If the variation in the pressure is less than 0.15 kPa(gauge) [1.125 mmHg(gauge)], the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and stores DTC P0441 (2 trip detection logic).
Atmospheric pressure check:
In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.
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: Purge VSV stuck open/close Within 30 seconds: Purge flow |
MIL Operation |
2 driving cycles |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
All
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 |
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) |
Engine |
Running |
Engine coolant temperature |
4.4°C (40°F) or higher |
Intake air temperature |
4.4°C (40°F) or higher |
Canister pressure sensor malfunction |
Not detected |
Purge VSV |
Not operated by scan tool |
EVAP system check |
Not operated by scan tool |
Battery voltage |
10 V or higher |
Purge duty-cycle |
8% or higher |
TYPICAL MALFUNCTION THRESHOLDS
Purge VSV Stuck Open
EVAP pressure when vacuum introduction is complete |
Higher than [reference pressure x 0.2] |
EVAP pressure change after purge VSV is open |
Less than 0.3 kPa(gauge) [2.25 mmHg(gauge)] |
Both of the following conditions are met: |
Conditions 1 and 2 |
1. EVAP pressure change when purge flow is started |
Less than 0.1 kPa(gauge) [0.75 mmHg(gauge)] |
2. EVAP pressure change during purge operation when vent valve closed |
Less than 0.15 kPa(gauge) [1.125 mmHg(gauge)] |
MONITOR RESULT
Refer to Checking Monitor Status (See page
).
CONFIRMATION DRIVING PATTERN
HINT:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
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 |
Engine Coolant Temperature Circuit Range / Performance Problem (P0116)
DESCRIPTION
Refer to DTC P0115 (See page ).
DTC No.
DTC Detection Condition
Trouble Area
P0116
When either of the following conditions is met (2 trip detection logic).
During engine ...
Precaution
PRECAUTION
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following system after the cable is reconnected.
System Name
See Procedure
Back Door Closer System
...
Intake Air Temperature Circuit Low Input (P0112,P0113)
DESCRIPTION
The intake air temperature sensor, in the mass air flow meter, monitors
the intake air temperature. The intake air temperature sensor has a built-in
thermistor with a resistance that varies according to the temperature of
the ...