Toyota Sequoia (2005). Manual — part 163
A23481
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak Pressure
sec
Negative
ON
ON
Sequence
Time
A
10
sec
60
Within 15 minutes
sec
ON
First 0.02 inch
B
C
D
EVAP Pressure when 0.02 Inch Orifice Clogged:
OK
Malfunction
ON: Open
OFF: Closed
OFF: Vent
ON: Closed
10
Standard
sec
60
E
–
DIAGNOSTICS
ENGINE
DI–447
641
(a)
P043E: 0.02 inch orifice clogged
In operation B, the vacuum pump creates negative pressure (vacuum) through the 0.02 inch orifice. The
EVAP system pressure is then measured by the ECM, using the pressure sensor, to determine the 0.02 inch
leak pressure standard. If the pressure is lower than –4.85 kPa (–36.38 mmHg)*, the ECM interprets this
as a clog malfunction in the 0.02 inch orifice, and stops the EVAP (Evaporative Emission) system monitor.
The ECM then illuminates the MIL and sets the DTC (2 trip detection logic).
*: The threshold varies according to the atmospheric pressure measured in operation A. The value described
above is based on an atmospheric pressure of 100 kPa (750.1 mmHg): absolute pressure.
A23482
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak Pressure
sec
Negative
ON
ON
Sequence
Time
A
10
sec
60
Within 15 minutes
sec
ON
First 0.02 inch
B
C
D
OK
Malfunction
ON: Open
OFF: Closed
OFF: Vent
ON: Closed
10
Standard
sec
60
E
EVAP Pressure when 0.02 Inch Orifice High–flow malfunction:
DI–448
–
DIAGNOSTICS
ENGINE
642
(b)
P043F: 0.02 inch orifice high–flow
In operation B, the vacuum pump creates negative pressure (vacuum) through the 0.02 inch orifice. The
EVAP system pressure is then measured by the ECM using the pressure sensor to determine the 0.02 inch
leak pressure standard. If the pressure is higher than –1.06 kPa (–7.95 mmHg)*, the ECM interprets this as
a high–flow malfunction in the 0.02 inch orifice, and stops the EVAP system monitor. The ECM then illumi-
nates the MIL and sets the DTC (2 trip detection logic).
*: The threshold varies according to the atmospheric pressure measured in operation A. The value described
above is based on a atmospheric pressure of 100 kPa (750.1 mmHg): absolute pressure.
MONITOR STRATEGY
R l t d DTC
P043E
0.02 inch orifice clog (built–in pump module)
Related DTCs
P043F
0.02 inch orifice high–flow (built–in pump module)
Required sensors/components
Pump module
Frequency of operation
Once per driving cycle
Duration
Within 2 min. (varies with amount of fuel in tank)
MIL operation
2 driving cycle
Sequence of operation
None
–
DIAGNOSTICS
ENGINE
DI–449
643
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
The monitor will run whenever these
DTCs are not present
See page
Following values are values when atmo-
spheric is 760 mmHg (100 kPa)
–
EVAP key–off monitor runs when all of the
following conditions met:
–
Atmospheric pressure
525 to 825 mmHg (70 to 110 kPa)
Battery voltage
10.5 V
–
Vehicle speed
–
4 km/h (2.5 mph)
Ignition switch
OFF
Engine condition
Not running
Time after engine stopped
5 hours
FTP sensor malfunction (P0450, 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
Both of the following conditions are met
before IG switch OFF
Condition 1 and 2
1. Duration that vehicle is driven
5 min.
–
2. Purge flow
Executed
ECT
4.4 to 35
°
C (40 to 95
°
F)
IAT
4.4 to 35
°
C (40 to 95
°
F)
Example of re–start time
–
First time
7 hours
Second time
9 hours and 30 min.
Key–off monitor sequence
1 to 8
1. Atmospheric pressure
–
Next sequence is run if following condition
set
–
Atmospheric pressure change for 10 sec.
–
2.25 mmHg (0.3 kPa) for 1 sec.
2. First reference pressure
–
Next sequence is run if all of following
conditions set
Condition 1, 2 and 3
1. FTP when 4 sec. after reference pres-
sure measurement
–
–7.5 mmHg (–1 kPa)
2. Reference pressure
–36.38 to –7.93 mmHg (–4.85 to –1.057 kPa)
3. Reference pressure
Saturated
3. Vent valve stuck closed check
–
Next sequence is run if following condition
set
–
FTP change for 10 sec. after vent valve
ON (closed)
2.25 mmHg (0.3 kPa)
–
4. Vacuum introduction and leak
–
DI–450
–
DIAGNOSTICS
ENGINE
644
Next sequence is run if both of following
conditions set
Condition 1 and 2
1. Vacuum introduction time
–
15 min.
2. FTP
FTP was saturated
5. Purge VSV stuck closed check
–
Next sequence is run if following condition
set
–
FTP change for 10 sec. after purge VSV
ON (open)
2.25 mmHg (0.3 kPa)
–
6. Second reference pressure measure-
ment
–
Next sequence is run if all of following
conditions set
Condition 1, 2, 3 and 4
1. FTP when 4 sec. after reference pres-
sure measurement
–
–7.5 mmHg (–1 kPa)
2. Reference pressure
–36.38 to –7.93 mmHg (–4.85 to –1.057 kPa)
3. Reference pressure
Saturated
4. Reference pressure difference between
first and second
–
5.25 mmHg (0.7 kPa)
7. Leak check
–
Next sequence is run if following condition
set
–
FTP when vacuum introduction was com-
plete
–
Second reference pressure
8. Atmospheric pressure
–
Monitor is complete if following
–
Atmospheric pressure difference between
sequence 1 and 8
–
2.25 mmHg (0.3 kPa)
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Following values are when atmospheric pressure is 760
mmHg (100 kPa)
–
One of the following conditions is met
–
FTP when 4 sec. after reference pressure measurement
began
More than –7.5 mmHg (–1 kPa)
Reference pressure
Less than –36.38 mmHg (–4.85 kPa)
Reference pressure
–7.93 mmHg (–1.057 kPa) or more
Reference pressure
Not saturated
Reference pressure difference between first and second
5.3 mmHg (0.7 kPa) or more
MONITOR RESULT (MODE 06 DATA)
Refer to page
for detailed information on Monitor Result.
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page
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