Toyota Sequoia (2005). Manual - part 169

A23501

ON

Within 15 minutes

2/5

0.02 inch Orifice High–flow

Vent Valve Stuck closed

OK

0.02 inch Orifice Clogged

60

sec

3/5

4 sec

Vacuum Pump Stuck OFF

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

First 0.02 inch

Standard

–

DIAGNOSTICS

ENGINE

DI–471

665

6

Perform EVAP system step 2/5 check.

HINT:
Make a note of the pressures checked in steps (a) and (b) below.
(a)

Check the EVAP pressure 4 seconds after the vacuum pump is activated*.

(b)

Check the EVAP pressure again when it has stabilized. This pressure is the 0.02 inch leak pressure
standard.

*: The vacuum pump begins to operate as step 1/5 is proceeded to step 2/5.

Result:

DTCs*

Test Results

Suspected Trouble Areas

Proceed To



EVAP pressure in step (b) between –4.85 kPa
and –1.06 kPa (–36.38 mmHg and –7.95 mmHg)

Not yet determined

A

P043F and P2401

EVAP pressure in step (b) –1.06 kPa (–7.95
mmHg) or more

0.02 inch orifice high–flow

Vacuum pump stuck OFF

B

P043E

EVAP pressure in step (b) below –4.85 kPa
(–36.38 mmHg)

0.02 inch orifice clogged

C

P2419

EVAP pressure in step (a) more than –1.06 kPa
(–7.95 mmHg)

Vent valve stuck closed

D

*: The DTCs relating to the EVAP system displayed on a hand–held tester when checking.

B

Go to step 11

C

Go to step 30

D

Go to step 19

A

A23502

ON

Within 15 minutes

2/5

Vent Valve Stuck open (vent)

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

First 0.02 inch

Standard

DI–472

–

DIAGNOSTICS

ENGINE

666

7

Perform EVAP system step 2/5 to 3/5 check.

(a)

Check the EVAP pressure increase in step 3/5.
Result:

DTCs*

Test Results

Suspected Trouble Areas

Proceed To



EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
2/5 to step 3/5

Not yet determined

A

P2420

No variation in EVAP pressure despite proceeding
from step 2/5 to step 3/5

Vent valve stuck open (vent)

B

P0451

No variation in EVAP pressure during steps 1/5
through 3/5

Pressure sensor malfunction stuck

C

*: The DTCs relating to the EVAP system displayed on a hand–held tester when checking.

B

Go to step 19.

C

Go to step 30.

A

A23502

Purge VSV

Vent Valve

Vacuum Pump

EVAP Pressure

Positive

Leak Pressure

ON: Open

Negative

ON

ON

Steps

(Reference)

Within 15 minutes

ON

First 0.02 inch

3/5

OFF: Closed

OFF: Vent

ON: Closed

Time

Standard

–

DIAGNOSTICS

ENGINE

DI–473

667

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

ON

ON

Purge VSV

Vent Valve

Vacuum Pump

EVAP Pressure

Positive

Negative

Steps

(Reference)

Time

ON: Open
OFF: Closed

OFF: Vent

ON: Closed

OK

10

sec

Leak Pressure

First 0.02 inch

Standard

DI–474

–

DIAGNOSTICS

ENGINE

668

9

Perform EVAP system step 4/5 check.

(a)

Check the EVAP pressure in step 4/5.

DTCs*

Test Results

Suspected Trouble Areas

Proceed 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 determined

A

P0441

EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
3/5 to step 4/5

Problems in EVAP hose between pure VSV and
throttle body

B

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 closed

C

*: 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