Toyota Sequoia (2005). Manual — part 117
–
DIAGNOSTICS
ENGINE
DI–263
457
Battery voltage
10 V
–
Purge duty cycle
8 %
–
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Purge VSV stuck open:
FTP when vacuum introduction was compleat
Higher than reference pressure x 0.2
Purge VSV stuck closed:
FTP change for 10 sec. after purge VSV ON
Less than 2.25 mmHg (0.3 kPa)
Purge flow:
Both of the following conditions are met
Condition 1 or 2
1. FTP change when purge operation is started
Less than 0.75 mmHg (0.1 kPa)
2. FTP change during purge operation when vent valve is
closed
Less than 3.75 mmHg (0.5 kPa)
MONITOR RESULT (MODE 06 DATA)
Refer to page
for detailed information on Monitor Result.
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page
DI–264
–
DIAGNOSTICS
ENGINE
458
DTC
P0450
Evaporative Emission Control System Pres-
sure Sensor/Switch
DTC
P0451
Evaporative Emission Control System Pres-
sure Sensor/Switch Range/Performance
DTC
P0452
Evaporative Emission Control System Pres-
sure Sensor/Switch Low Input
DTC
P0453
Evaporative Emission Control System Pres-
sure Sensor/Switch High Input
DTC SUMMARY
DTC
Monitoring Items
Malfunction Detection Conditions
Trouble Areas
Detection Tim-
ings
Detection
Logic
P0450
Pressure sensor voltage ab-
normal fluctuation
Sensor output voltage rapidly fluctuates
beyond upper and lower malfunction
thresholds for 0.5 seconds.
Pump module
Connector/Wire harness
(Pump module – ECM)
ECM
EVAP monitor-
ing (ignition
OFF)
Ignition ON
1 trip
P0451
Pressure sensor noising
Sensor output voltage fluctuates fre-
quently in certain time period.
Pump module
Connector/Wire harness
(Pump module – ECM)
ECM
EVAP monitor-
ing (ignition
OFF)
Engine running
2 trip
P0451
Pressure sensor stuck
Sensor output voltage does vary in cer-
tain time period.
Pump module
Connector/Wire harness
(Pump module – ECM)
ECM
EVAP monitor-
ing (ignition
OFF)
2 trip
P0452
Pressure sensor voltage low
Sensor output voltage is less than 0.45
V for 0.5 seconds.
Pump module
Connector/Wire harness
(Pump module – ECM)
ECM
Ignition ON
EVAP monitor-
ing (ignition
OFF)
1 trip
P0453
Pressure sensor voltage high
Sensor output voltage is more than 4.9
V for 0.5 seconds.
Pump module
Connector/Wire harness
(Pump module – ECM)
ECM
Ignition ON
EVAP monitor-
ing (ignition
OFF)
1 trip
HINT:
The pressure sensor is built into the pump module.
CIRCUIT DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) Inspection Procedure (see page
DID89–01
B17403
Pressure Sensor Specification:
Output Voltage
Usable Range
4.900 V
4.150 V
1.425 V
0.450 V
Malfunction Area
Pressure
60
kPa
110
kPa
Malfunction Area
Standard atmospheric pressure is 101.3 kPa
HINT:
–
DIAGNOSTICS
ENGINE
DI–265
459
MONITOR DESCRIPTION
(a)
DTC P0450: Pressure sensor voltage abnormal fluctua-
tion.
If the pressure sensor voltage output rapidly fluctuates
between less than 0.45 V and more than 4.9 V, the ECM
interprets this as an open or short circuit malfunction in
the pressure sensor or its circuit, and stops the EVAP
(Evaporative Emission) system monitor. The ECM then il-
luminates the MIL and sets the DTC (1 trip detection log-
ic).
(b)
DTC P0451: Pressure sensor noising or stuck
If the pressure sensor voltage output fluctuates rapidly for
10 seconds, the ECM stops the EVAP system monitor.
The ECM interprets this as noise from the pressure sen-
sor, and stops the EVAP system monitor. The ECM then
illuminates the MIL and sets the DTC.
Alternatively, if the sensor voltage output does not
change for 10 seconds, the ECM interprets this as the
sensor being stuck, and stops the monitor. The ECM then
illuminates the MIL and sets the DTC.
(Both the malfunctions are detected by 2 trip detection
logic)
(c)
DTC P0452: Pressure sensor voltage low
If the pressure sensor voltage output is below 0.45 V, the
ECM interprets this as an open or short circuit malfunction
in the pressure sensor or its circuit, and stops the EVAP
system monitor. The ECM then illuminates the MIL and
sets the DTC (1 trip detection logic).
(d)
DTC P0453: Pressure sensor voltage high
If the pressure sensor voltage output is 4.9 V or more, the
ECM interprets this as an open or short circuit malfunction
in the pressure sensor or its circuit, and stops the EVAP
system monitor. The ECM then illuminates the MIL and
sets the DTC (1 trip detection logic).
DI–266
–
DIAGNOSTICS
ENGINE
460
MONITOR STRATEGY
P0450
Evaporative emission control system pressure
sensor/switch chattering
P0451
Evaporative emission control system pressure
sensor noise
Related DTCs
P0451
Evaporative emission control system pressure
sensor stuck
P0452
Evaporative emission control system pressure
sensor/switch low input
P0453
Evaporative emission control system pressure
sensor/switch high input
Required sensors/components
Pump module
Frequency of operation
Once per driving cycle
Duration
0.5 sec.: P0450, P0452, P0453
10 sec.: P0451
MIL operation
Immediate: P0450, P0452, P0453
2 driving cycles: P0451
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
The monitor will run whenever these
DTCs are not present
See page
Pressure sensor noise:
Atmospheric pressure
525 to 825 mmHg (70 to 110 kPa)
Battery voltage
10.5 V
–
IAT
4.4 to 35
°
C (40 to 95
°
F)
FTP sensor malfunction (P0450, P0452,
P0453)
Not detected
Either of the following conditions is met
Condition 1 or 2
1. Time after engine stopped
5 hours
2. Engine condition
Running
Example of re–start time
–
First time
7 hours
Second time
9 hours and 30 min.
Pressure sensor stuck:
Battery voltage
10.5 V
–
IAT
4.4 to 35
°
C (40 to 95
°
F)
FTP sensor malfunction (P0450, P0452,
P0453)
Not detected
Atmospheric pressure
525 to 825 mmHg (70 to 110 kPa)
Time after engine stopped
5 hours
Example of re–start time
–
First time
7 hours
Second time
9 hours and 30 min.
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