Toyota Tundra (2015 year). Manual — part 1185
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000SWH0CIX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456; Evaporative Emission Control System
Leak Detected (Gross Leak); 2015 MY Tundra [08/2014 - ]
DTC
P0455
Evaporative Emission Control System Leak Detected (Gross Leak)
DTC
P0456
Evaporative Emission Control System Leak Detected (Very Small Leak)
DTC SUMMARY
DTC
NO.
MONITORING
ITEM
MALFUNCTION DETECTION
CONDITION
TROUBLE AREA
DETECTION
TIMING
DETECTION
LOGIC
P0455
EVAP gross
leak
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 EVAP system
has large leak.
Fuel tank
cap (loose)
Leak from
EVAP line
(Canister -
Fuel tank)
Leak from
EVAP line
(Purge
VSV -
Canister)
Canister
pump
module
Leak from
fuel tank
Leak from
canister
While
ignition
switch off
2 trip
P0456
EVAP small
leak
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, ECM
determines that EVAP system has
small leak.
Fuel tank
cap (loose)
Leak from
EVAP line
(Canister -
Fuel tank)
Leak from
EVAP line
(Purge
VSV -
Canister)
Canister
pump
module
While
ignition
switch off
2 trip
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
DTC
NO.
MONITORING
ITEM
MALFUNCTION DETECTION
CONDITION
TROUBLE AREA
DETECTION
TIMING
DETECTION
LOGIC
Leak from
fuel tank
Leak 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
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
60 seconds
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
SEQUENCE
OPERATION
DESCRIPTION
DURATION
pressure, ECM determines that EVAP system leaking.
-
Final check
Atmospheric pressure measured and then monitoring result
recorded by ECM.
-
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 leak, illuminates the MIL and stores 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 leak, illuminates the MIL
and stores the DTC (2 trip detection logic).
1UR-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
P0452, P0453 (EVAP system)
P0455 (Pattern 1), P0456
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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456;...
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