Toyota Sequoia (2005). Manual — part 168
–
DIAGNOSTICS
ENGINE
DI–467
661
2
Perform EVAP system check.
NOTICE:
In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 5 EVAP SYSTEM CHECK steps
is performed automatically. It takes a maximum of approximately 18 minutes.
Do not perform the EVAP SYSTEM CHECK when the fuel tank is more than 90% full because
the cut–off valve may be closed and making the leak check of the fuel tank unavailable.
Do not run the engine in this step.
When the temperature of the fuel is 35
C
(95
F) or more, a large amount of vapor forms and any
check results become inaccurate. When performing the EVAP SYSTEM CHECK, keep the tem-
perature below 35
C
(95
F).
(a)
Clear DTCs (see page
(b)
On the hand–held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYS-
TEM CHECK / EVAP SYS CHECK / AUTO OPERATION.
(c)
After the EVAP SYSTEM CHECK is completed, check for pending DTCs by selecting the following
menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
HINT:
If no pending DTC is displayed, perform the Monitor Confirmation after this repair is completed. After this
confirmation, check for pending DTCs. If no DTC is displayed, the EVAP system is normal.
NEXT
A23497
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak Pressure
ON: Open
Negative
ON
ON
Steps
(Reference)
60
Within 15 minutes
10
60
ON
First 0.02 inch
2/5
3/5
4/5
5/5
OFF: Closed
OFF: Vent
ON: Closed
EVAP SYSTEM CHECK
sec
sec
sec
Normal Pressure
10
sec
1/5
Gross Leak
No Leak
Small Leak
Time
Leak Pressure
Second 0.02 inch
Standard
Standard x 0.2
DI–468
–
DIAGNOSTICS
ENGINE
662
3
Perform EVAP system manual operation check.
NOTICE:
In the EVAP SYSTEM CHECK (MANUAL OPERATION), the series of 5 EVAP SYSTEM CHECK
steps is performed manually.
Do not perform the EVAP SYSTEM CHECK when the fuel tank is more than 90% full because
the cut–off valve may be closed and making the leak check of the fuel tank unavailable.
Do not run the engine in this step.
When the temperature of the fuel is 35
C
(95
F) or more, a large amount of vapor forms and any
check results become inaccurate. When performing the EVAP SYSTEM CHECK, keep the tem-
perature below 35
C
(95
F).
(a)
Clear DTCs (see page
(b)
On the hand–held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYS-
TEM CHECK / EVAP SYS CHECK / MANUAL OPERATION.
NEXT
A23499
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
Negative
ON
ON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent
ON: Closed
10
sec
1/5
Time
Pressure Sensor Noising
OK
Leak Pressure
First 0.02 inch
Standard
–
DIAGNOSTICS
ENGINE
DI–469
663
4
Perform EVAP system step 1/5 check.
(a)
Check the EVAP pressure in step 1/5.
Result:
DTCs*
Test Results
Suspected Trouble Areas
Proceed To
Virtually no variation in EVAP pressure
Not yet determined
A
P0451
EVAP pressure fluctuates by
0.3 kPa
(2.25 mmHg) or more
Pressure sensor noising
B
*: The DTCs relating to the EVAP system displayed on a hand–held tester when checking.
B
Go to step 30
A
A23500
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
Negative
ON
ON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent
ON: Closed
10
sec
1/5
Time
Vacuum Pump Stuck ON
60
sec
2/5
Leak Pressure
First 0.02 inch
Standard
DI–470
–
DIAGNOSTICS
ENGINE
664
5
Perform EVAP system step 1/5 to 2/5 check.
(a)
Check the EVAP pressure in step 1/5 and 2/5.
Result:
DTCs*
Test Results
Suspected Trouble Areas
Proceed To
Virtually no variation in EVAP pressure during step
1/5. Then decreases to 0.02 inch leak pressure
standard*
Not yet determined
A
P2402
Small difference between EVAP pressures during
steps 1/5 and 2/5
Vacuum pump stuck ON
B
*: The DTCs relating to the EVAP system displayed on a hand–held tester when checking.
HINT:
The 0.02 inch leak pressure standard is the value determined in step 2/5.
B
Go to step 23.
A
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