Toyota Tundra (2015 year). Manual — part 1941
DTC
CODE
MONITORING
ITEM
MALFUNCTION DETECTION
CONDITION
TROUBLE AREA
DETECTION
TIMING
DETECTION
LOGIC
Canister
pump
module
Leakage
from fuel
tank
Leakage
from
canister
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*1
300
seconds*2
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*1*3
30
minutes*2,
*3
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
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:
In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system
and the EVAP system pressure is measured. If the stabilized system pressure is higher than
[second reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the
EVAP system has a large leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
(b) P0456: EVAP very small leak
In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system
and the EVAP system pressure is measured. If the stabilized system pressure is higher than the
second reference pressure, the ECM determines that the EVAP system has a small leakage,
illuminates the MIL and sets the DTC (2 trip detection logic).
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
MONITOR STRATEGY
Required Sensors/Components
Purge VSV and canister pump module
Duration
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
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
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
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
P0455 (Gross leak)
EVAP pressure when vacuum introduction complete
Higher than reference pressure x 0.2
P0456 (Small leak)
EVAP pressure when vacuum introduction
complete
Between reference pressure and reference pressure x
0.2
MONITOR RESULT
Refer to CHECKING MONITOR STATUS
.
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.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
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