2001 TOYOTA SEQUOIA check engine

A23502
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak PressureON: Open
NegativeONON
Steps
(Reference)Within 15 minutesON
First 0.02 inch
3/5
OFF: Closed
OFF: Vent ON: Closed
Time Standard
± DIAGNOSTICSENGINE
DI±473
667 Author: Date:
2005 SEQUOIA (RM1146U)
8 Perform EVAP system step 3/5 check.
(a) Wait until the EVAP pressure change is less than 0.1 kPa (0.75 mmHg) for 30 seconds.
(b) Measure the EVAP pressure and record it.
HINT:
A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel
tank, it takes up to 12 minutes.
NEXT

A23504
ON
Purge VSV Stuck Closed
4/5
ONON
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
Steps
(Reference)TimeON: Open
OFF: Closed
OFF: Vent ON: Closed
OK
10
sec
Leak Pressure First 0.02 inch
Standard
DI±474
± DIAGNOSTICSENGINE
668 Author: Date:
2005 SEQUOIA (RM1146U)
9 Perform EVAP system step 4/5 check.
(a) Check the EVAP pressure in step 4/5.
DTCs*Test ResultsSuspected Trouble AreasProceed To
'
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
3/5 to step 4/5
Not yet determinedA
P0441
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
3/5 to step 4/5Problems in EVAP hose between pure VSV and
throttle bodyB
P0441
Variation in EVAP pressure is less than 0.3 kPa
(2.25 mmHg) for 10 seconds, after proceeding from
step 3/5 to step 4/5
Purge VSV stuck closedC
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
B Go to step 15.
C Go to step 12.
A

A23505
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
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 PressureSecond 0.02 inch
Standard x 0.2
± DIAGNOSTICSENGINE
DI±475
669 Author: Date:
2005 SEQUOIA (RM1146U)
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 ResultsSuspected Trouble AreasProceed 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
P0455EVAP 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 leakB
P0456EVAP pressure (step 3/5) higher than second 0.02
inch leak pressure standard (step 5/5)EVAP small leakB
*: 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
ONON
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
Steps
(Reference)TimeON: Open
OFF: Closed
OFF: Vent ON: Closed
Leak Pressure 0.02 inch
Standard
2/5
Vacuum Pump Stuck OFF
Within 15 minutes
DI±476
± DIAGNOSTICSENGINE
670 Author: Date:
2005 SEQUOIA (RM1146U)
11 Perform EVAP system step 3/5 check.
(a) Check the EVAP pressure in step 3/5.
Result:
DTCs*Test ResultsSuspected Trouble AreasProceed To
'EVAP pressure less than [0.02 inch leak pressure
standard x 0.2]0.02 inch orifice high±flowA
'EVAP pressure more than [0.02 inch leak pressure
standard x 0.2]Vacuum pump stuck OFFB
*: 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
HosePurge VSV
± DIAGNOSTICSENGINE
DI±477
671 Author: Date:
2005 SEQUOIA (RM1146U)
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 ResultsSuspected Trouble AreasProceed To
No suction when purge VSV turned OFF, and suction applied
when tuned ONPurge VSV normalA
Suction applied when purge VSV turned OFFPurge VSV stuck openB
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
± DIAGNOSTICSENGINE
672 Author: Date:
2005 SEQUOIA (RM1146U)
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 ResultsSuspected Trouble AreasProceed 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.

B17419
HosePurge VSV
B17420
HosePurge VSV
± DIAGNOSTICSENGINE
DI±479
673 Author: Date:
2005 SEQUOIA (RM1146U)
14 Inspect EVAP VSV.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the V4 purge VSV connector.
(c) Disconnect the hose (connected to the canister) from the
purge VSV.
(d) Start the engine.
CHECK:
Use your finger to confirm that the purge VSV has no suction.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
No suctionECMA
Suction appliedPurge VSVB
A Go to step 34.
B Go to step 30.
15 Check EVAP hose between purge VSV and throttle body.
PREPARATION:
(a) Disconnect the hose (connected to the throttle body) from
the purge VSV.
(b) Start the engine.
CHECK:
(a) Use your finger to confirm that the hose has suction.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Suction appliedEVAP hose between purge VSV and throttle body
normalA
No suction

Throttle body

EVAP hose between purge VSV and throttle
body
B
B Go to step 26.
A

B02272
Battery
Air
B17440
Wire Harness Side:
Purge VSV Connector
V4
Front View
DI±480
± DIAGNOSTICSENGINE
674 Author: Date:
2005 SEQUOIA (RM1146U)
16 Inspect EVAP VSV.
PREPARATION:
(a) Remove the purge VSV.
(b) Apply battery voltage to the terminals of the purge VSV.
CHECK:
Using an air gun, confirm that air flows from port A to port B.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Suction appliedEVAP hose between purge VSV and throttle body
normalA
No suction

Throttle body

EVAP hose between purge VSV and throttle
body
B
B Go to step 31.
A
17 Measure purge VSV terminal voltage.
PREPARATION:
(a) Disconnect the V4 purge VSV connector.
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between terminal 1 of the purge VSV
connector and the body ground.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Between 11 V and 14 VNormalA
Other than result aboveWire harness or connectors between purge VSV
and ECMB
B Go to step 32.
A