Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001HT3M |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [03/2019 - 11/2022] |
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0441; Evaporative Emission Control System Incorrect Purge Flow; 2020 - 2023 MY Corolla [03/2019 - 11/2022] |
DTC
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P0441
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Evaporative Emission Control System Incorrect Purge Flow
|
DTC SUMMARY
DTC No.
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Detection Item
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DTC Detection Condition
|
Trouble Area
|
MIL
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Memory
|
Note
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P0441
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Evaporative Emission Control System Incorrect Purge Flow
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One of the following conditions met:
-
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.
-
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 engine running, following conditions successively met:
-
Negative pressure not created in EVAP system when purge VSV turned on (open)
-
EVAP system pressure change less than 0.15 kPa [0.02 psi] when vent valve turned on (closed)
-
Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa [0.02 psi]
|
-
Purge VSV
-
Purge line
-
Connector/wire harness (Purge VSV - ECM)
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ECM
-
Canister pump module
-
Canister (filter inside canister clogged)
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No. 2 charcoal canister filter (filter inside canister clogged)
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Leak from EVAP system
|
Comes on
|
DTC stored
|
DTC for Mexico Models
- Does not apply
|
DTC No.
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Monitoring Item
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Detection Timing
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Detection Logic
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P0441
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Purge VSV (Vacuum Switching Valve) stuck open
|
While ignition switch off
|
2 trip
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Purge VSV stuck closed
|
While ignition switch off
|
2 trip
|
Purge flow
|
While engine running
|
2 trip
|
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System.
Click here
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.
-
KEY-OFF MONITOR
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 less than 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 less than 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.
Sequence
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Operation
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Description
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Duration
|
-
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ECM activation
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Activated by soak timer 5, 7 or 9.5 hours after ignition switch turned off.
|
-
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A
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Atmospheric pressure measurement
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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) [10.15 psi(abs) and 15.95 psi(abs)], ECM cancels EVAP system monitor.
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60 seconds
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B
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First reference pressure measurement
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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.
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360 seconds
|
C
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EVAP system pressure measurement
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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*
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D
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Purge VSV monitor
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Purge VSV opened and then EVAP system pressure is measured by ECM.
A large increase indicates normality.
|
10 seconds
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E
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Second reference pressure measurement
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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
|
-
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Final check
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Atmospheric pressure is measured and then monitoring result is recorded by ECM.
|
-
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*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
*1
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Purge VSV: Off (Closed)
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*2
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Purge VSV: On (Open)
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*3
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Vent Valve: Off (Vent)
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*4
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Vent Valve: On (Closed)
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*5
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Leak Detection Pump: Off
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*6
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Leak Detection Pump: On
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*7
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Reference Orifice (0.02 inch)
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*8
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Canister Pressure Sensor
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*9
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Canister
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*10
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Fuel Tank
|
*11
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Canister Pump Module
|
*12
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Canister Filter
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*a
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Operation A:
Atmospheric Pressure Measurement
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*b
|
Operation B, E:
Reference Pressure Measurement
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*c
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Operation C:
EVAP System Pressure Measurement
|
*d
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Operation D:
Purge VSV Monitor
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*e
|
Atmospheric Pressure
|
*f
|
Negative Pressure
|
-
Purge VSV stuck open
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. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC (2 trip detection logic).
-
Purge VSV stuck closed
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 [0.04 psi] 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 this DTC (2 trip detection logic).
-
PURGE FLOW MONITOR
The purge flow monitor consists of 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.
-
The 1st monitor
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 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 [0.02 psi], 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
Less than 30 seconds: Purge flow
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MIL Operation
|
2 driving cycles
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Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
Key-off Monitor
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)
|
Ignition switch
|
Off
|
Time after key-off
|
5, 7 or 9.5 hours
|
Canister pressure sensor malfunction (P0451, 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 the 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)
|
Purge Flow Monitor
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 (P0451, P0452, P0453)
|
Not detected
|
Purge VSV
|
Not operated by scan tool
|
EVAP system check
|
Not operated by scan tool
|
Atmospheric pressure
|
75 kPa(abs) [10.9 psi(abs)] or higher, and less than 111 kPa(abs) [16 psi(abs)]
|
Battery voltage
|
10 V or higher (intake air temperature less than 50°C (122°F))
12 V or higher (intake air temperature 50°C (122°F) 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]
|
Purge VSV Stuck Closed
EVAP pressure change after purge VSV is open
|
Less than 0.3 kPa [0.04 psi]
|
Purge Flow
Both of the following conditions are met
|
-
|
EVAP pressure change when purge flow is started
|
Less than 0.1 kPa [0.02 psi]
|
EVAP pressure change during purge flow when vent valve is on (closed)
|
Less than 0.15 kPa [0.02 psi]
|
MONITOR RESULT
Refer to EVAP System.
Click here
CONFIRMATION DRIVING PATTERN
-
Connect the Techstream to the DLC3.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Start the engine and wait 15 minutes or more.
-
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
-
Read the pending DTCs.
HINT:
-
If a pending DTC is output, the system is malfunctioning.
-
If a pending DTC is not output, perform the following procedure.
-
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
-
Input the DTC: P0441.
-
Check the DTC judgment result.
Techstream Display
|
Description
|
NORMAL
|
-
DTC judgment completed
-
System normal
|
ABNORMAL
|
-
DTC judgment completed
-
System abnormal
|
INCOMPLETE
|
-
DTC judgment not completed
-
You should perform driving pattern after confirming DTC enabling conditions
|
N/A
|
-
Unable to perform DTC judgment
-
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
HINT:
-
If the judgment result shows NORMAL, the system is normal.
-
If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result shows INCOMPLETE or N/A, perform the following procedure.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
-
After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
-
Input the DTC: P0441.
-
Check the DTC judgment result.
Techstream Display
|
Description
|
NORMAL
|
-
DTC judgment completed
-
System normal
|
ABNORMAL
|
-
DTC judgment completed
-
System abnormal
|
INCOMPLETE
|
-
DTC judgment not completed
-
Perform driving pattern after confirming DTC enabling conditions
|
N/A
|
-
Unable to perform DTC judgment
-
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
HINT:
-
If the judgment result shows NORMAL, the system is normal.
-
If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
-
If a permanent DTC is output, the system is malfunctioning.
-
If no permanent DTC is output, the system is normal.
PROCEDURE
(a) Refer to EVAP System.
Click here
NEXT |
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END
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