Toyota Tundra (2015 year). Manual — part 1179
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) system
.
INSPECTION PROCEDURE
Refer to the EVAP System
.
MONITOR DESCRIPTION
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.
-
The leak detection pump creates negative pressure through the reference orifice. When the system is normal, the
EVAP pressure is between 724 and 752 mmHg* and saturated within a minute. If not, the ECM interprets this as
a malfunction. The ECM will illuminate the MIL and store a DTC if this malfunction is detected in consecutive drive
cycles.
*: Typical value.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E,P043F,...
MONITOR STRATEGY
Required Sensors/Components
Canister pump module
Duration
Within 7 minutes
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
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, 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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E,P043F,...
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
"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa-g (2.14 mmHg-g) in 60 seconds.
EVAP pressure just after reference pressure measurement started
More than -0.25 kPa-g (-1.88 mmHg-g)
Reference pressure
Less than -4.85 kPa-g (-36.4 mmHg-g)
Reference pressure
-1.057 kPa-g (-7.93 mmHg-g) or more
Reference pressure
Not saturated within 360 seconds
Reference pressure difference between first and second measurement
0.9 kPa-g (6.75 mmHg-g) or more
CONFIRMATION DRIVING PATTERN
NOTICE:
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear 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.
5.
Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check /
Automatic Mode.
6.
After "Evaporative System Check" is completed, check All Readiness by entering the following menus:
Powertrain / Engine and ECT / Utility / All Readiness.
7.
Input the DTC: P043E, P043F, P2401, P2402 or P2419.
8.
Check the DTC judgment result.
TESTER
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
9.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E,P043F,...
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст