Toyota Tundra. Manual — part 1262

Fig. 240: EVAP Pressure Graph (Step 4/5)

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

Result

RESULT CHART

B : Go to step 15

C : Go to step 12

A : Go to next step.

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 EVAP hose
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
from step 3/5 to step 4/5

Purge VSV stuck closed

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 (1GR-FE) - Tundra

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

Fig. 241: EVAP Pressure Graph (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 CHART

A : Go to step 35

B : Go to step 12

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

P0455

EVAP pressure (step 3/5) higher than
[second reference pressure (step 5/5) x 0.2]



Purge VSV stuck open



EVAP gross leak

B

P0456

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

EVAP small leak

B

(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 (1GR-FE) - Tundra

11. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/5)

Fig. 242: EVAP Pressure Graph (Step 3/5)

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

Result

RESULT CHART

HINT:

The first reference pressure is the value determined in step 2/5.

A : Go to step 29

B : Go to step 22

DTCs

(1)

Test Result

Suspected Trouble Area

Proceed

To

P043F

EVAP pressure less than [reference pressure]
measured at 2/5

Reference orifice high-
flow

A

P2401

EVAP pressure almost same as [reference
pressure] measured at 2/5

Leak detection pump
stuck OFF

B

(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 (1GR-FE) - Tundra

12. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

a. Enter the following menus: Powertrain/Engine and ECT/Active Test/Activate the VSV for EVAP

Control.

b. Disconnect the hose (connected to the canister) from the purge VSV.

c. Start the engine.

d. Using the Techstream, turn off the purge VSV (EVAP VSV (ALONE), Activate the VSV for

EVAP Control: OFF).

e. Use your finger to confirm that the purge VSV has no suction.

f. Using the Techstream, turn on the purge VSV (EVAP VSV (ALONE), Activate the VSV for

EVAP Control: ON).

g. Use your finger to confirm that the purge VSV has suction.

Fig. 243: Locating Purge VSV Connector

Result

RESULT CHART

B : Go to step 14

C : Go to step 15

A : Go to next step.

13. CHECK FUEL CAP ASSEMBLY

Test Result

Suspected Trouble Area

Proceed

To

No suction when purge VSV turned OFF,
and suction applied when turned 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 intake air surge tank

C

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra