Toyota Tundra. Manual — part 1619

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.

Standard

DISPLAY CONDITIONS

b. Other inspection method:

The ASV operation can be confirmed by checking the cumulative pressure pulsation* provided in
the System Check.

Perform System Check operation under Manual Mode. *: The exhaust pulsation value is calculated
in 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.

Air Pump Operations ASV Operations Exhaust Gas Pulsation

ON

OFF

Not detected

ON

ON

Detected

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:45 PM

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1. Start the engine and warm it up.

2. Turn the ignition switch off.

3. Connect the Techstream to the DLC3.

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

5. 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.

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

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

8. Check that the air-fuel ratio and pressure in the secondary air injection system passage

(PULSATION) displayed on the Techstream indicate the conditions shown in the table
below.

9. Turn the ignition switch off.

OK

DISPLAY CONDITIONS

Reference:

If the air pump operation is confirmed as normal (see DTC P2444 SECONDARY AIR
INJECTION SYSTEM PUMP STUCK ON BANK 1; DTC P2445 SECONDARY AIR
INJECTION SYSTEM PUMP STUCK OFF BANK 1; DTC P2446 SECONDARY AIR
INJECTION SYSTEM PUMP STUCK ON BANK 2; DTC P2447 SECONDARY AIR
INJECTION SYSTEM PUMP STUCK OFF BANK 2 ), the air-fuel ratio detected in front
of three-way catalytic converter changes in response to the secondary air pumped into the
exhaust port when the air pump operates.

Result

RESULT CHART

B: Go to step 9

A: Go to Next Step

AIR System

Operation

Pulsation Condition (ECM

Calculation)

Air-Fuel Ratio (Reference)

AIR PUMP: ON,

ASV: OPEN

20 kPa or more

18 or more

AIR PUMP: OFF,

ASV: CLOSE

Less than 30 kPa

Approximately 14.5 (around

stoichiometric air-fuel ratio)

Result Proceed to

NG

A

OK

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:45 PM

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3. INSPECT AIR TUBE (BLOCKAGES AND LEAKAGES)

a. Check that the No. 2 and No. 3 air tubes are securely connected to both the exhaust manifold and

the ASV.

b. Inspect the air tube for blockages and damage.

OK:

No blockages and damage on intake pipe.

NG: REPLACE AIR TUBE (See REMOVAL )

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:45 PM

Page 571

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Fig. 248: Identifying Air Tube
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to Next Step

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:46 PM

Page 572

© 2006 Mitchell Repair Information Company, LLC.