Toyota Tundra. Manual — part 1574
Typical Malfunction Thresholds
TYPICAL MALFUNCTION THRESHOLDS
TYPICAL MALFUNCTION THRESHOLDS
OBD II MONITOR SPECIFICATIONS
1. Purge Flow Monitor
Monitor Strategy
MONITOR STRATEGY
Typical Enabling Conditions
TYPICAL ENABLING CONDITIONS
Typical Malfunction Thresholds
Leak detection pump
Not operated by scan tool
Both of following conditions met before key off
Conditions 1 and 2
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)
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)
Required Sensors/Components Purge VSV and canister pump module
Frequency of Operation
Once per driving cycle
Duration
Within 10 minutes
MIL Operation
2 driving cycles
Sequence of Operation
None
Monitor runs whenever following DTCs not present P0452, P0453 (EVAP System)
Engine
Running
ECT
4.4°C (40T) or more
IAT
4.4°C (40°F) or more
Purge VSV
Not operated by scan tool
EVAP system check
Not operated by scan tool
Battery voltage
10 V or more
Purge duty cycle
8% or more
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS .
DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR
RANGE/PERFORMANCE; DTC P0452 EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR/SWITCH LOW INPUT; DTC P0453 EVAPORATIVE EMISSION CONTROL
SYSTEM PRESSURE SENSOR/SWITCH HIGH INPUT
DTC SUMMARY
DTC SUMMARY
Both of following conditions met
Conditions 1 and 2
1. EVAP pressure change when purge operation started
Less than 0.1 kPa-g (0.75 mmHg-
g)
2. EVAP pressure change during purge operation when vent valve
closed
Less than 0.4 kPa-g (3 mmHg-g)
DTC
Monitoring
Item
Malfunction
Detection
Condition
Trouble Area
Detection Timing
Detection
Logic
P0451
Canister
pressure sensor
noise
Sensor output
voltage fluctuates
frequently within
certain time
period.
Canister pump module
Connector/wire harness
(Canister pump module
- ECM)
EVAP system hose
(pipe from air inlet port
to canister pump
module, canister filter,
fuel tank vent hose)
ECM
EVAP
monitoring
(ignition
switch off)
Engine
running
2 trip
Canister
pressure sensor
signal becomes
fixed/flat
Sensor output
voltage does not
vary within certain
time period.
Canister pump module
Connector/wire harness
(Canister pump module
- ECM)
EVAP system hose
(pipe from air inlet port
to canister pump
module, canister filter,
fuel tank vent hose)
ECM
EVAP
monitoring
(ignition
switch off)
2 trip
Canister pump module
Connector/wire harness
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
HINT:
The canister pressure sensor is built into the canister pump module.
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System (see DESCRIPTION ).
MONITOR DESCRIPTION
Fig. 175: Canister Pressure Sensor Output Voltage Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1. DTC P0451: Canister pressure sensor noise or fixed/flat
If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP
system monitor. The ECM interprets this as noise from the canister pressure sensor, and stops the EVAP
P0452
Canister
pressure sensor
low input
EVAP pressure
less than 42.1 kPa
for 0.5 seconds.
(Canister pump module
- ECM)
EVAP system hose
(pipe from air inlet port
to canister pump
module, canister filter,
fuel tank vent hose)
ECM
Ignition
switch ON
EVAP
monitoring
(ignition
switch off)
1 trip
P0453
Canister
pressure sensor
high input
EVAP pressure
more than 123.8
kPa for 0.5
seconds.
Canister pump module
Connector/wire harness
(Canister pump module
- ECM)
EVAP system hose
(pipe from air inlet port
to canister pump
module, canister filter,
fuel tank vent hose)
ECM
Ignition
switch ON
EVAP
monitoring
(ignition
switch off)
1 trip
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
system monitor. The ECM then illuminates the MIL and stores the DTC.
Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as the
sensor being fixed/flat, and stops the monitor. The ECM then illuminates the MIL and stores the DTC.
(Both malfunctions are detected by 2 trip detection logic.)
2. DTC P0452: Canister pressure sensor voltage low
If the canister pressure sensor output [pressure] is below 42.1 kPa-a (315.9 mmHg-a), the ECM interprets
this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the
EVAP system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection logic).
3. DTC P0453: Canister pressure sensor voltage high
If the canister pressure sensor output [pressure] is 123.8 kPa-a (928.4 mmHg-a) or more, the ECM
interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and
stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection
logic).
MONITOR STRATEGY
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P0451 (Noise monitor):
TYPICAL ENABLING CONDITIONS - P0451
P0451 (Fixed/flat monitor):
Required Sensors/Components
Canister pump module
Frequency of Operation
Once per driving cycle: P0451 sensor fixed/flat
Continuous: P0451 sensor noise, P0452 and P0453
Duration
0.5 seconds: P0452 and P0453
2 minutes: P0451
MIL Operation
Immediate: P0452 and P0453
2 driving cycles: P0451
Sequence of Operation
None
Monitor runs whenever following DTCs not present
P0452, P0453 (EVAP System)
Atmospheric pressure (absolute pressure)
70 to 110 kPa-a (525 to 825 mmHg-a)
Battery voltage
10.5 V or more
Intake air temperature
4.4 to 35°C (40 to 95°F)
Either of following conditions met
A or B
A. Engine condition
Running
B. Time after key off
5 or 7 or 9.5 hours
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
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