Toyota Tundra (2015 year). Manual — part 1180
TESTER
DISPLAY
DESCRIPTION
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and
check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
10.
MONITOR RESULT
Refer to Checking Monitor Status
.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E,P043F,...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000SWF0DBX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evaporative Emission Control System Incorrect Purge
Flow; 2015 MY Tundra [08/2014 - ]
DTC
P0441
Evaporative Emission Control System Incorrect Purge Flow
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
If stabilized pressure higher than
[second reference pressure x 0.2],
ECM determines that purge VSV
stuck open.
Purge VSV
Connector/wire
harness (Purge
VSV - ECM)
ECM
Canister pump
module
Leak from EVAP
system
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
measured at start and at end of
check.
If pressure does not return to near
atmospheric pressure, ECM
determines that purge VSV stuck
closed.
Purge VSV
Connector/wire
harness (Purge
VSV - ECM)
ECM
Canister pump
module
Leak from EVAP
system
While
ignition
switch off
2 trip
Purge flow
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 0.4
kPa-g (3.0 mmHg-g)
when vent valve turned
ON (closed)
Atmospheric pressure
change before and after
purge flow monitor less
than 0.1 kPa-g (0.75
mmHg-g)
Purge VSV
Connector/wire
harness (Purge
VSV - ECM)
Leak from EVAP
line (Purge VSV -
Intake manifold)
ECM
While engine
running
2 trip
DESCRIPTION
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
The description can be found in the EVAP (Evaporative Emission) system
.
MONITOR DESCRIPTION
The two 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 leak detection pump creates negative pressure
(vacuum) in the EVAP 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 turned OFF (vent) and EVAP system pressure
measured by ECM in order to register atmospheric pressure.
If pressure in EVAP system not between 70 kPa-a and 110
kPa-a (525 mmHg-a and 825 mmHg-a), 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 turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and
EVAP system pressure 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 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:
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
Purge VSV stuck open
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 stores the DTC (2 trip detection logic).
a.
Purge VSV stuck closed
b.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0441; Evapor...
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