Toyota Tundra. Manual — part 1432

occur.



By using the Techstream to perform the Air Injection Check operation in the System Check, the air-fuel
ratio and the pressure in the secondary air injection system passage can be checked while the secondary
air injection system is operating. This helps technicians to troubleshoot the system when it malfunctions.
Furthermore, Pending Codes also can be checked by performing Utility/Air Injection Check/Automatic
Mode after the repair.



Read freeze frame data using the 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.

System Check:

The pressure in the secondary air passage can be checked using the Techstream.

a. Start the engine and warm it up.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

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

e. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Manual Mode/AIR

PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR PUMP 1: OFF, ASV1 CLOSE,
AIR PUMP 2: OFF, ASV2 CLOSE.

HINT:

When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is
performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and
ASV operation can be selected.

f. Start the engine.

g. Perform the AIR system intrusive operation while the engine is idling.

h. Check that the air pump (AIR PUMP), ASV and pressure in the AIR system passage (PRESSURE)

displayed on the tester indicate the conditions shown in the table below.

Standard

AIR PRESSURE SPECIFICATION

Tester Operations

AIR PUMP

ASV

PRESSURE

(1)

PULSATION

(2)

AIR PUMP: ON, ASV: OPEN

ON

OPEN

1 kPa or more

15 kPa or more

AIR PUMP: OFF, ASV: CLOSE

OFF

CLOSE

Less than 5 kPa

Less than 30 kPa

(1)

Average pumping pressure (gauge pressure). The pressure should be 1 kPa or more when the AIR
system operates.

(2)

The cumulative exhaust pulsation calculated by the ECM. If the calculated value exceeds a certain
level, the ECM determines that the exhaust pulsation is in the AIR system.

2008 Toyota Tundra

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

i. Turn the ignition switch off.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444, P2445, P2446 AND/OR

P2447)

a. Connect the Techstream to the DLC3.

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

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

d. Read DTCs.

Result

RESULT REFERENCE

If any DTCs other than P0418, P0419, P2444, P2445, P2446 and/or P2447 are output, troubleshoot
those DTCs first.

NOTE:



This Air Injection Check only allows technicians to operate the AIR
system for a maximum of 5 seconds.

Furthermore, the check can only be performed up to 4 times per trip.
If the test is repeated, intervals of at least 30 seconds are required
between checks.

While AIR system operation using the Techstream is prohibited, the
Techstream display indicates the prohibition (WAIT or ERROR).

If an ERROR is displayed on the Techstream during the test, stop the
engine for 10 minutes, and then try again.



Performing the Air Injection Check repeatedly may cause damage to
the AIR system. If necessary, leave an interval of several minutes
between System Check operations to prevent the system from
overheating.



When performing the Air Injection Check operation after the battery
cable has been reconnected, wait for 7 minutes with the ignition
switch turned to ON or the engine running.



Turn the ignition switch off when the Air Injection Check operation
finishes.

Result

Proceed

To

P2444, P2445, P2446 and/or P2447 are output

A

P2444, P2445, P2446 and/or P2447 and P0418 and/or P0419 are output

B

P2444, P2445, P2446 and/or P2447 and other DTCs (except P0418 and P0419) are
output

C

2008 Toyota Tundra

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

B : GO TO AIR PUMP INSPECTION PROCEDURE (See INSPECTION PROCEDURE )

C : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A : Go to Next Step

2. PERFORM ACTIVE TEST USING TECHSTREAM (SECONDARY AIR INJECTION SYSTEM

OPERATION)

a. Start the engine and warm it up.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

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

e. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Manual

Mode/AIR PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR PUMP 1:
OFF, ASV1: CLOSE, AIR PUMP 2: OFF, ASV2: CLOSE.

HINT:

When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement)
is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP
and ASV operation can be selected.

f. Start the engine.

g. Perform the AIR system intrusive operation while the engine is idling.

h. Check that the air pump (AIR PUMP), ASV and pressure in the AIR system passage (PRESSURE)

status displayed on the Techstream indicate the conditions shown in the table below.

Standard

AIR PRESSURE SPECIFICATION

i. Turn the ignition switch off.

Tester Operation

AIR PUMP

ASV

PRESSURE*

AIR PUMP: ON, ASV: OPEN

ON

ON

1 kPa or more

AIR PUMP: OFF, ASV: CLOSE

OFF

OFF

Less than 5 kPa

HINT:
*: Average pumping pressure. The pressure should be 1 kPa or more when the AIR system
operates.

NOTE:



This Air Injection Check only allows technicians to operate the
AIR system for a maximum of 5 seconds.

Furthermore, the check can only be performed up to 4 times per
trip. If the test is repeated, intervals of at least 30 seconds are

2008 Toyota Tundra

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

NG : Go to step 4

OK : Go to Next Step

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444, P2445, P2446 AND/OR P2247)

a. Start the engine and warm it up.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

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

e. Clear DTCs (if set). (See DTC CHECK/CLEAR ).

f. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Automatic

Mode.

g. Start the engine after the Techstream initialization is finished.

h. Perform the System Check operation by pressing Next.

i. After operating the AIR system, perform the following to confirm the AIR system pending codes:

Press the Exit button.

j. Check pending DTCs.

k. Turn the ignition switch off.

required between checks.

While AIR system operation using the Techstream is prohibited,
the Techstream display indicates the prohibition (WAIT or
ERROR).

If an ERROR is displayed on the Techstream during the test,
stop the engine for 10 minutes, and then try again.



Performing the Air Injection Check repeatedly may cause
damage to the AIR system. If necessary, leave an interval of
several minutes between System Check operations to prevent
the system from overheating.



When performing the Air Injection Check operation after the
battery cable has been reconnected, wait for 7 minutes with the
ignition switch turned to ON or the engine running.



Turn the ignition switch off when the Air Injection Check
operation finishes.

NOTE:



When performing the Air Injection Check operation after the
battery cable has been reconnected, wait for 7 minutes with the
ignition switch turned to ON or the engine running.



Turn the ignition switch off when the Air Injection Check
operation finishes.

2008 Toyota Tundra

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