Toyota Tundra. Manual — part 1427

HINT:



If the vacuum hose between the ASV and the pressure sensor is not connected correctly, case 4 may
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 Techstream 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

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 SECONDARY AIR INJECTION

SYSTEM DTCS)

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

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.

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

P2440, P2441, P2442 and/or P2443 are output

A

P2440, P2441, P2442 and/or P2443 and P0412 and/or P0415 are output

B

2008 Toyota Tundra

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

If any DTCs other than P0412, P0415, P2440, P2441, P2442 and/or P2443 are output, troubleshoot
those DTCs first.

B : GO TO AIR SWITCHING VALVE INSPECTION PROCEDURE (P0412 AND P0415) (See
INSPECTION PROCEDURE )

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

A : Go to Next Step

2. PERFORM ACTIVE TEST USING TECHSTREAM

a. Visual check

1. Start the engine and warm it up.

2. Turn the ignition switch off.

3. Disconnect the No. 2 air injection system hose and No. 2 air hose.

4. Connect the Techstream to the DLC3.

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

6. 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.

HINT:

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

7. Start the engine.

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

9. Place your hand near the air switching valve port and check that the exhaust gas pressure

pulsates when the ASV is turned ON.

P2440, P2441, P2442 and/or P2443 and other DTCs (except P0412 and P0415) are
output

C

CAUTION: To avoid the danger of being burned by the exhaust gas,

bring your hand close to the valve port slowly.

2008 Toyota Tundra

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

Fig. 231: Identifying Air Switching Valve Port & Exhaust Gas Pressure

10. 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: ON, ASV1: CLOSE, AIR PUMP 2: ON, ASV2: CLOSE.

11. Check that the exhaust gas does not pulsate when the ASV is turned OFF.

12. Turn the ignition switch off.

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.

2008 Toyota Tundra

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