Toyota Tundra. Manual — part 1443

A : Go to step 35

B : Go to step 12

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

Fig. 261: EVAP Pressure Graph - Perform EVAP System Check (Step 3/5)

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

Result

RESULT REFERENCE

P0455

[second reference pressure (step 5/5) x 0.2]



EVAP gross leak

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.

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

2008 Toyota Tundra

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

HINT:

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

A : Go to step 29

B : Go to step 22

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. 262: Identifying Hose To Canister From Purge VSV

Result

RESULT REFERENCE

(1)

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

Test Result

Suspected Trouble Area

Proceed

To

2008 Toyota Tundra

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

B : Go to step 14

C : Go to step 15

A : Go to Next Step

13. CHECK FUEL TANK CAP ASSEMBLY

a. Check that the fuel tank cap is correctly installed and confirm the fuel tank cap meets OEM

specifications.

b. Tighten the fuel tank cap 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 adapter.

2. Connect an EVAP tester pump hose to the adapter, and pressurize the cap to 3.2 to 3.7 kPa

(24 to 28 mmHg) using an EVAP tester pump.

3. Seal the adapter 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.

Result

RESULT REFERENCE

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 purge line between
purge VSV and intake manifold

C

Test Result

Suspected Trouble Area

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

Defective fuel tank cap

-

B

No fuel tank cap

-

C

2008 Toyota Tundra

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

A : Go to step 28

B : Go to step 26

C : Go to step 27

14. INSPECT PURGE VSV

a. Turn the ignition switch off.

b. Disconnect the D29 purge VSV connector.

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

d. Start the engine.

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

Fig. 263: Identifying Hose To Canister From Purge VSV

Result

RESULT REFERENCE

A : Go to step 34

B : Go to step 30

15. CHECK PURGE LINE (PURGE VSV - INTAKE MANIFOLD)

a. Disconnect the hose (connected to the intake manifold) from the purge VSV.

b. Start the engine.

c. Use your finger to confirm that the hose has suction.

Test Result Suspected Trouble Area Proceed To

No suction

ECM

A

Suction applied Purge VSV

B

2008 Toyota Tundra

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