Toyota Tundra (2015 year). Manual — part 1181
In operation D, the canister pressure sensor measures the EVAP system pressure. The
pressure measurement for the purge VSV monitor is begun when the purge VSV is turned ON
not increase, the ECM interprets this as the purge VSV being stuck closed. The ECM
illuminates the MIL and stores the DTC (2 trip detection logic).
PURGE FLOW MONITOR
2.
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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
pressure is less than 0.4 kPa-g (3.0 mmHg-g), the ECM interprets this as the purge VSV being stuck
closed, and illuminates the MIL and stores DTC P0441 (2 trip detection logic).
Atmospheric pressure check:
In order to ensure reliable malfunction detection, the variation between atmospheric pressure before and after conduction
1. Key-off Monitor
Monitor Strategy
Required Sensors/Components
Purge VSV and canister pump module
Duration
2 driving cycles
Typical Enabling Condition
Monitor runs whenever following DTCs not stored
P0452, P0453 (EVAP system)
Atmospheric pressure
70 to 110 kPa-a (525 to 825 mmHg-a)
Battery voltage
10.5 V or more
Vehicle speed
Below 4 km/h (2.5 mph)
Ignition switch
Off
Time after key off
5 or 7 or 9.5 hours
Purge VSV
Not operated by scan tool
Vent valve
Not operated by scan tool
Leak detection pump
Not operated by scan tool
1. Duration that vehicle 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)
Typical Malfunction Threshold
Purge VSV stuck open:
-
EVAP pressure when vacuum introduction complete
Reference pressure x 0.2 or higher
Purge VSV stuck closed:
-
EVAP pressure change after purge VSV ON (open)
Less than 0.3 kPa-g (2.25 mmHg-g)
OBD II MONITOR SPECIFICATIONS
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
1. Purge Flow Monitor
Monitor Strategy
Required Sensors/Components
Purge VSV and canister pump module
Duration
Less than 30 sec.
MIL Operation
2 driving cycles
Typical Enabling Condition
Monitor runs whenever following DTCs not present
P0452, P0453 (EVAP system)
Engine
Running
ECT
4.4°C (40°F) or more
IAT
4.4°C (40°F) or more
Purge VSV
Not operated by scan tool
EVAP system check
Not operated by scan tool
Atmospheric pressure
70 to 111 kPa (525 to 833 mmHg)
Battery voltage
10 V or more
Purge duty cycle
8% or more
Typical Malfunction Threshold
1. EVAP pressure change when purge operation started
Less than 0.1 kPa-g (0.75 mmHg-g)
2. EVAP pressure change during purge operation when vent valve closed
Less than 0.4 kPa-g (3.0 mmHg-g)
MONITOR RESULT
Refer to Checking Monitor Status
.
CONFIRMATION DRIVING PATTERN
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
3.
Turn the ignition switch off and wait for at least 30 seconds.
4.
Turn the ignition switch to ON and turn the Techstream on [A].
5.
Start the engine and wait 15 minutes or more [B].
6.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
7.
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.
8.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
9.
Input the DTC: P0441.
10.
Check the DTC judgment result.
TESTER
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
NOTICE:
11.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
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