Toyota Tundra. Manual — part 1433

Result

RESULT REFERENCE

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 (PRESSURE SENSOR)

a. Connect a pressure gauge to the air pressure sensor as shown in the illustration.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON and the Techstream ON.

d. Enter the following menus: Powertrain/Engine and ECT/Data List/Air pump pressure (absolute)

and Air Pump2 Pressure (Absolute).

e. Check that the pressure displayed on the Techstream fluctuates when applying the pressure to the

pressure sensor with the pressure gauge.

OK: Pressure fluctuates in response to pressure applied with pressure gauge.

Result

RESULT REFERENCE

HINT:

The Techstream displays the air pump pressure as absolute pressure.

Result

Proceed To

P2444, P2445, P2446 and/or P2447 are output

A

No pending DTC is output

B

Result

Proceed To

OK

A

NG (for Bank 1)

B

NG (for Bank 2)

C

2008 Toyota Tundra

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

Fig. 236: Connecting Pressure Gauge To Air Pressure Sensor

B : REPLACE AIR SWITCHING VALVE . (See AIR SWITCHING VALVE (FOR BANK 1) ).

C : REPLACE AIR SWITCHING VALVE . (SeeAIR SWITCHING VALVE (FOR BANK 2) ).

A : Go to Next Step

6. CHECK AIR INJECTION SYSTEM PIPE CONNECTIONS

2008 Toyota Tundra

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

Fig. 237: 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

a. Disconnect the D57 or E10 air pump connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Result

RESULT REFERENCE

Tester Connection Condition Specified Condition

2 - 1

20°C (68°F)

0.44 to 1 ohms

2008 Toyota Tundra

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

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

HINT:

To check the air pump operation, use the Air Injection Check function described in the System
Check.

Fig. 238: Identifying Air Pump Connector Terminal

B : REPLACE AIR PUMP . (See AIR PUMP (FOR BANK 1) ).

C : REPLACE AIR PUMP . (See AIR PUMP (FOR BANK 2) ).

A : Go to Next Step

8. INSPECT AIR INJECTION CONTROL DRIVER (AIR INJECTION CONTROL DRIVER

POWER SOURCE CIRCUIT)

a. Disconnect the D48 and D50 or D52 and D54 AID connectors.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Result

Proceed To

OK

A

NG (for Bank 1)

B

NG (for Bank 2)

C

Tester Connection

Condition Specified Condition

D50-1 (E) - Body ground

Always

Below 1 ohms

2008 Toyota Tundra

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