Toyota Tundra. Manual — part 1261

HINT:

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

B : Go to step 22

A : Go to next step.

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

Fig. 237: EVAP System Graph - 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

(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

RESULT CHART

B : Go to step 11

C : Go to step 29

D : Go to step 20

A : Go to next step.

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

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

P2401

EVAP pressure in step (b) -1.057 kPa-g (-7.93
mmHg-g) or more



Reference orifice
high-flow



Leak detection
pump stuck OFF

B

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 (1GR-FE) - Tundra

Fig. 238: EVAP Pressure Graph (Step 2/5 To 3/5)

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

Result

RESULT CHART

B : Go to step 19

C : Go to step 29

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 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 (1GR-FE) - Tundra

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

Fig. 239: EVAP Pressure Graph (Step 3/5)

a. Wait until the EVAP pressure change is less than 0.1 kPa-g (0.75 mmHg-g) 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 15 minutes.

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

2008 Toyota Tundra

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