Toyota Tundra. Manual — part 1440

Fig. 251: EVAP System - Wiring Diagram

CONFIRMATION DRIVING PATTERN

HINT:

After a repair, check Monitor Status by performing the Key-Off Monitor Confirmation and Purge Flow Monitor
Confirmation described below.

1. KEY-OFF MONITOR CONFIRMATION

a. Preconditions

2008 Toyota Tundra

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

The monitor will not run unless:



The vehicle has been driven for 10 minutes or more (in a city area or on a freeway)



The fuel tank is less than 90% full



The altitude is less than 2438 m (8000 ft.)



The Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F)



The Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F)



The vehicle remains stationary (the vehicle speed is 0 km/h [0 mph])

b. Monitor Conditions

1. Allow the engine to idle for at least 5 minutes.

2. Turn the ignition switch off and wait for 6 hours (8 or 10.5 hours).

HINT:

Do not start the engine until checking Monitor Status. If the engine is started, the steps
described above must be repeated.

c. Monitor Status

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream ON.

3. Enter the following menus: Powertrain/Engine and ECT/Monitor/Evaporative System.

4. Check the Monitor Status displayed on the Techstream.

HINT:

If Incomplete is displayed, the monitor is not complete. Make sure that the preconditions
have been met, and perform the Monitor Conditions again.

2. PURGE FLOW MONITOR CONFIRMATION (P0441)

HINT:

Perform this monitor confirmation after the Key-Off Monitor Confirmation shows Complete.

a. Preconditions

The monitor will not run unless:



The vehicle has been driven for 10 minutes or more (in a city area or on a freeway)



The ECT is between 4.4 and 35°C (40 and 95°F)



The IAT is between 4.4 and 35°C (40 and 95°F)

b. Monitor Conditions

1. Release the pressure from the fuel tank by removing and reinstalling the fuel cap.

2008 Toyota Tundra

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

2. Warm the engine up until the ECT reaches more than 75°C (167°F).

3. Increase the engine speed to 3000 RPM once.

4. Allow the engine to idle and turn A/C ON for 1 minute.

c. Monitor Status

1. Turn the ignition switch off (if ON or the engine is running).

2. Connect the Techstream to the DLC3.

3. Turn the ignition switch to ON and turn the Techstream ON.

4. Enter the following menus: Powertrain/Engine and ECT/Monitor /

5. Check the Monitor Status displayed on the Techstream.

HINT:

If Incomplete is displayed, the monitor is not complete. Make sure that the preconditions
have been met, and perform the Monitor Conditions again.

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

INSPECTION PROCEDURE

HINT:



Using Techstream monitor results enables the EVAP (Evaporative Emission) system to be confirmed.



Read freeze frame data using the or Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.

1. CONFIRM DTC

a. Turn the ignition switch off and wait for 10 seconds.

b. Turn the ignition switch to ON.

c. Turn the ignition switch off and wait for 10 seconds.

d. Connect the Techstream to the DLC3.

e. Turn the ignition switch to ON and turn the Techstream ON.

f. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

g. Confirm DTCs and freeze frame data.

If any EVAP system DTCs are set, the malfunctioning area can be determined using the table
below.

NOTE:

The Techstream is required to conduct the following diagnostic troubleshooting
procedure.

2008 Toyota Tundra

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

Fig. 252: DTC Chart

2. PERFORM EVAP SYSTEM CHECK (AUTO OPERATION)

NOTE:

If the reference pressure difference between the first and second
checks is greater than the specification, all the DTCs relating to the
reference pressure (P043E, P043F, P2401, P2402 and P2419) are
stored.

NOTE:



The Evaporative System Check (Automatic Mode) consists of 5 steps
performed automatically by the Techstream. It takes a maximum of
approximately 18 minutes.



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

2008 Toyota Tundra

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