Toyota Tundra (2015 year). Manual — part 1935
SEQUENCE
OPERATION
DESCRIPTION
DURATION
D
Purge VSV monitor
Purge VSV opened and then EVAP system pressure
measured by ECM.
Large increase indicates normality.
10 seconds
E
Second reference
pressure
measurement
After second reference pressure measurement, leak
check performed by comparing first and second
reference pressure.
If stabilized system pressure higher than second
reference pressure, ECM determines that EVAP
system leaking.
60 seconds
-
Final check
Atmospheric pressure measured and then
monitoring result recorded by ECM.
-
HINT:
*1: for 100 L (26.4 US gal) Fuel Tank
*2: for 144 L (38 US gal) Fuel Tank
In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP
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 (Vacuum Switching Valve) being stuck open. The ECM
illuminates the MIL and sets the DTC (2 trip detection logic).
a.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
*1: for 100 L (26.4 US gal) Fuel Tank
*2: for 144 L (38 US gal) Fuel Tank
Purge VSV stuck closed
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 (open)
increase, the ECM interprets this as the purge VSV being stuck closed. The ECM illuminates the
MIL and sets the DTC (2 trip detection logic).
b.
PURGE FLOW MONITOR
for 100 L (26.4 US gal) Fuel Tank:
2.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
for 144 L (38 US gal) Fuel Tank:
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 0.4 kPa-g (3 mmHg-g), the ECM interprets this as the purge VSV being stuck closed,
and illuminates the MIL and sets DTC P0441 (2 trip detection logic).
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-g (1.125 mmHg-g), the ECM interprets this as the purge VSV being stuck
closed, and illuminates the MIL and sets 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
1. Key-off Monitor
Monitor Strategy
Required Sensors/Components
Purge VSV and canister pump module
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
Duration
Within 20 minutes (varies with fuel in tank): Purge VSV stuck open/ close
MIL Operation
2 driving cycles
Typical Enabling Conditions
Monitor runs whenever following DTCs not stored
None
Atmospheric pressure
70 to 111 kPa-a (525 to 833 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
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
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 Thresholds
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
1. Purge Flow Monitor
Monitor Strategy
Required Sensors/Components
Purge VSV and canister pump module
Duration
Within 30 seconds
MIL Operation
2 driving cycles
Typical Enabling Conditions
Monitor runs whenever following DTCs not present
None
Engine
Running
ECT
4.4°C (40°F) or more
IAT
4.4°C (40°F) or more
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
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