Toyota Tundra. Manual — part 1254

RESULT CHART

HINT:

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

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

HINT:

When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement)
is performed automatically. The initialization takes 10 seconds. After the initialization, AP (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 PUMP OPERATION CHART

Display (DTC Output)

Proceed To

P2444, P2445, P2446 and/or P2447

A

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

B

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

C

Tester Operations

AIR PUMP

ASV

PRESSURE*

AP (AIR PUMP): ON, ASV: OPEN

ON

ON

1 kPa or more

AP (AIR PUMP): OFF, ASV: CLOSE

OFF

OFF

Less than 1 kPa

2008 Toyota Tundra

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

i. Turn the ignition switch OFF.

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 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 Enter.

i. After operating the AIR system, press the Enter button to confirm the AIR system pending codes.

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
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 repetitively 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 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 (1GR-FE) - Tundra

j. Check Pending.

k. Turn the ignition switch OFF.

Result

RESULT CHART

B : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

A : Go to next step.

4. CHECK VACUUM HOSES (PRESSURE SENSOR - AIR SWITCHING VALVE)

a. Check the vacuum hose connections with the pressure sensor and ASV.

b. Inspect the vacuum hose for blockages and damage.

OK: Vacuum hose has no blockages or damage.

NG : REPAIR OR REPLACE VACUUM HOSE

OK : Go to next step.

5. INSPECT AIR SWITCHING VALVE ASSEMBLY (PRESSURE SENSOR) (See INSPECTION

PROCEDURE )

NG : REPLACE AIR SWITCHING VALVE ASSEMBLY . (See AIR SWITCHING VALVE ).

OK : Go to next step.

6. CHECK AIR INJECTION SYSTEM PIPE CONNECTIONS

NOTE:



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



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

Display (DTC output)

Proceed To

P2444, P2445, P2446 and/or P2447

A

No pending DTC

B

2008 Toyota Tundra

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

Fig. 219: Identifying Air Injection System Pipe Connections

a. Check that all the pipes and hoses between the air pump and ASV are securely connected.

b. Inspect the pipes and hoses for blockages and damage.

OK: AIR system piping has no blockages or damage.

NG : REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING

OK : Go to next step.

7. INSPECT AIR PUMP ASSEMBLY

a. Disconnect the D56 or D57 air pump connector.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

If the result is not as specified, replace the air pump.

HINT:

Tester Connection Condition Specified Condition

1 - 2

20°C (68°F)

0.44 to 1 ohms

2008 Toyota Tundra

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