Toyota Sequoia (2005). Manual — part 170
A23505
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
Negative
ON
ON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent
ON: Closed
Time
60
sec
5/5
Leak Pressure
First 0.02 inch
Standard
Gross Leak
Small Leak
No Leak
Leak Pressure
Second 0.02 inch
Standard x 0.2
–
DIAGNOSTICS
ENGINE
DI–475
669
10
Perform EVAP system step 5/5 check.
(a)
Check the EVAP pressure in step 5/5.
(b)
Compare the EVAP pressure in step 3/5 and the second 0.02 inch leak pressure standard (step 5/5).
Result:
DTCs*
Test Results
Suspected Trouble Areas
Proceed To
EVAP pressure (step 3/5) lower than the second
0.02 inch leak pressure standard (step 5/5)
Not yet determined (no leakage from EVAP system)
A
P0441 and
P0455
EVAP pressure (step 3/5) higher than [second 0.02
inch leak pressure standard (step 5/5) x 0.2]
Purge VSV stuck open
EVAP gross leak
B
P0456
EVAP pressure (step 3/5) higher than second 0.02
inch leak pressure standard (step 5/5)
EVAP small leak
B
*: The DTCs relating to the EVAP system displayed on a hand–held tester when checking.
A
Go to step 36.
B
Go to step 12.
A23506
ON
0.02 inch Orifice High–flow
3/5
ON
ON
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
Steps
(Reference)
Time
ON: Open
OFF: Closed
OFF: Vent
ON: Closed
Leak Pressure
0.02 inch
Standard
2/5
Vacuum Pump Stuck OFF
Within 15 minutes
DI–476
–
DIAGNOSTICS
ENGINE
670
11
Perform EVAP system step 3/5 check.
(a)
Check the EVAP pressure in step 3/5.
Result:
DTCs*
Test Results
Suspected Trouble Areas
Proceed To
EVAP pressure less than [0.02 inch leak pressure
standard x 0.2]
0.02 inch orifice high–flow
A
EVAP pressure more than [0.02 inch leak pressure
standard x 0.2]
Vacuum pump stuck OFF
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.
A
Go to step 30.
B
Go to step 23.
B17420
Hose
Purge VSV
–
DIAGNOSTICS
ENGINE
DI–477
671
12
Perform active test of purge VSV.
PREPARATION:
(a)
On the hand–held tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II/ ACTIVE TEST /
EVAP VSV.
(b)
Disconnect the hose (connected to the canister) from the
purge VSV.
(c)
Start the engine.
CHECK:
(a)
On the tester, turn off the purge VSV (EVAP VSV: OFF).
(b)
Use your finger to confirm that the purge VSV has no suc-
tion.
(c)
Using the tester, turn on the purge VSV (EVAP VSV: ON).
(d)
Use your finger to confirm that the purge VSV has suction.
RESULT:
Test Results
Suspected Trouble Areas
Proceed To
No suction when purge VSV turned OFF, and suction applied
when tuned ON
Purge VSV normal
A
Suction applied when purge VSV turned OFF
Purge VSV stuck open
B
No suction when purge VSV turned ON
Purge VSV stuck closed
Problems with EVAP hose between purge VSV and throttle
body
C
B
Go to step 14.
C
Go to step 15.
A
DI–478
–
DIAGNOSTICS
ENGINE
672
13
Check fuel tank cap.
CHECK:
(a)
Check that the fuel tank cap is correctly installed.
(b)
Confirm that the fuel tank cap is tightened until a few click sounds are heard.
HINT:
If an EVAP tester is available, check the fuel tank cap using the tester.
(1)
Remove the fuel tank cap and install it onto a fuel tank cap adaptor.
(2)
Connect an EVAP tester pump hose to the adaptor, and pressurize to 3.2 to 3.7 kPa (24 to 28
mmHg) using an EVAP tester pump.
(3)
Seal the adaptor and wait for 2 minutes.
(4)
Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel tank cap is normal.
(5)
Reinstall the fuel tank cap.
PREPARATION:
Test Results
Suspected Trouble Areas
Proceed To
Fuel tank cap correctly installed
A
Fuel tank cap loose
Fuel tank cap improperly installed
Defective fuel tank cap
Fuel tank cap does not meet OEM specifications
B
No fuel tank cap
C
A
Go to step 29.
B
Go to step 27.
C
Go to step 28.
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