Toyota Tundra. Manual — part 1441

a. Clear DTCs. (See DTC CHECK/CLEAR ).

b. Enter the following menus: Powertrain/Engine and ECT/Utility/Evaporative System

Check/Automatic Mode.

c. After the Evaporative System Check is completed, check for pending DTCs by entering the

following menus: Powertrain/Engine and ECT/Trouble Codes/Pending.

HINT:

If no pending DTCs are displayed, perform the MONITOR CONFIRMATION. See Techstream
Diagnostic Operation Information. After this confirmation, check for pending DTCs. If no DTCs
are displayed, the EVAP system is normal.

3. PERFORM EVAP SYSTEM CHECK (MANUAL OPERATION)

Fig. 253: EVAP Pressure Graph - Perform EVAP System Check (Manual Operation)

NOTE:



In the Evaporative System Check (Manual Mode), perform the series
of 5 Evaporative System Check steps manually using the
Techstream.



Do not perform the Evaporative System Check when the fuel tank is
more than 90% full because the cut-off valve may be closed. If the
cut-off valve is closed, the fuel tank leak check is not possible.



Do not run the engine during this operation.



When the temperature of the fuel is 35°C (95°F) or more, a large

2008 Toyota Tundra

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

a. Clear DTCs. (See DTC CHECK/CLEAR ).

b. Enter the following menus: Powertrain/Engine and ECT/Utility/Evaporative System Check/Manual

Mode.

4. PERFORM EVAP SYSTEM CHECK (STEP 1/5)

Fig. 254: EVAP Pressure Graph - Perform Evap System Check (Step 1/5)

a. Check the EVAP pressure in step 1/5.

Result

RESULT REFERENCE

B : Go to step 29

amount of vapor forms and any check results become inaccurate.
When performing the Evaporative System Check, keep the
temperature below 35°C (95°F).

DTCs

(1)

Test Result

Suspected Trouble

Area

Proceed

To

-

Virtually no variation in EVAP pressure

Not yet determined

A

P0451

EVAP pressure fluctuates by +/-0.3 kPa-g (+/-2.25
mmHg-g) or more

Canister pressure sensor
noise

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 (2UZ-FE) - Tundra

A : Go to Next Step

5. PERFORM EVAP SYSTEM CHECK (STEP 1/5 TO 2/5)

Fig. 255: EVAP Pressure Graph - Perform EVAP System Check (Step 1/5 To 2/5)

a. Check the EVAP pressure in steps 1/5 and 2/5.

Result

RESULT REFERENCE

HINT:

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

B : Go to step 22

DTCs

(1)

Test Result

Suspected Trouble

Area

Proceed

To

-

Virtually no variation in EVAP pressure during step 1/5.
Then decreases to reference pressure

Not yet determined

A

P2402

Small difference between EVAP pressures during steps
1/5 and 2/5

Leak detection pump
stuck ON

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 (2UZ-FE) - Tundra

A : Go to Next Step

6. PERFORM EVAP SYSTEM CHECK (STEP 2/5)

Fig. 256: EVAP Pressure Graph - Perform EVAP System Check (Step 2/5)

HINT:

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

a. Check the EVAP pressure 4 seconds after the leak detection pump is activated*.

*: The leak detection pump begins to operate as step 1/5 finishes and step 2/5 starts.

b. Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure.

Result

RESULT REFERENCE

DTCs

(1)

Test Result

Suspected Trouble Area

Proceed

To

-

EVAP pressure in step (b) between -4.85 kPa-g
and -1.057 kPa-g (-36.4 mmHg-g and -7.93
mmHg-g)

Not yet determined

A

P043F and EVAP pressure in step (b) -1.057 kPa-g (-7.93



Reference orifice
high-flow

B

2008 Toyota Tundra

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