Toyota Tundra. Manual — part 1442

B : Go to step 11

C : Go to step 29

D : Go to step 20

A : Go to Next Step

7. PERFORM EVAP SYSTEM CHECK (STEP 2/5 TO 3/5)

Fig. 257: EVAP Pressure Graph - Perform EVAP System Check (Step 2/5 To 3/5)

a. Check the EVAP pressure increase in step 3/5.

Result

P2401

mmHg-g) or more



Leak detection
pump stuck OFF

P043E

EVAP pressure in step (b) below -4.85 kPa-g (-
36.4 mmHg-g)

Reference orifice clogged

C

P2419

EVAP pressure in step (a) more than -1.057 kPa-
g (-7.93 mmHg-g)

Vent valve stuck closed

D

(1)

These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the
"CONFIRM DTC" procedures above.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

RESULT REFERENCE

B : Go to step 19

C : Go to step 29

A : Go to Next Step

8. PERFORM EVAP SYSTEM CHECK (STEP 3/5)

Fig. 258: EVAP Pressure Graph - Perform EVAP System Check (Step 3/5)

a. Wait until the EVAP pressure change is less than 0.1 kPa-g (0.75 mmHg-g) for 30 seconds.

DTCs

(1)

Test Result

Suspected Trouble

Area

Proceed

To

-

EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g)
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

Canister pressure
sensor output value
stuck

C

(1)

These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the
"CONFIRM DTC" procedures above.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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 15 minutes.

9. PERFORM EVAP SYSTEM CHECK (STEP 4/5)

Fig. 259: EVAP Pressure Graph - Perform EVAP System Check (Step 4/5)

a. Check the EVAP pressure in step 4/5.

Result

RESULT REFERENCE

DTCs

(1)

Test Result

Suspected Trouble Area

Proceed

To

-

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

Problems in purge line
between purge VSV and
intake manifold

B

P0441 Variation in EVAP pressure less than 0.3 kPa-g

(2.25 mmHg-g) for 10 seconds, after proceeding

Purge VSV stuck closed

C

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

B : Go to step 15

C : Go to step 12

A : Go to Next Step

10. PERFORM EVAP SYSTEM CHECK (STEP 5/5)

Fig. 260: EVAP Pressure Graph - Perform EVAP System Check (Step 5/5)

a. Check the EVAP pressure in step 5/5.

b. Compare the EVAP pressure in step 3/5 and the second reference pressure (step 5/5).

Result

RESULT REFERENCE

from step 3/5 to step 4/5

(1)

These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the
"CONFIRM DTC" procedures above.

DTCs

(1)

Test Result

Suspected Trouble Area

Proceed

To

-

EVAP pressure (step 3/5) lower than
second reference pressure (step 5/5)

Not yet determined (no leakage
from EVAP system)

A

P0441 and EVAP pressure (step 3/5) higher than



Purge VSV stuck open

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra