Toyota Tundra. Manual — part 1620

4. INSPECT AIR SWITCHING VALVE

a. Inspect the air switching valve (see INSPECTION ).

NG: REPLACE AIR SWITCHING VALVE (See REMOVAL )

OK: Go to Next Step

5. INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE OF AIR INJECTION

CONTROL DRIVER)

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

Fig. 249: Identifying D48 And D50 Or D52 And D54 AID Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Turn the ignition switch to ON.

c. Measure the voltage according to the value (s) in the table below.

Standard voltage

VOLTAGE SPECIFIED CONDITION

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection

Switch Condition

Specified Condition

D48-1 (BATT) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)
D50-5 (+B) - Body ground

Ignition switch ON 11 to 14 V (near battery voltage)

D52-1 (BAT2) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)
D54-5 (+B2) - Body ground

Ignition switch ON 11 to 14 V (near battery voltage)

Tester Connection

Condition Specified Condition

D50-1 (E) - Body ground

Always

Below 1 ohms

D54-1 (E2) - Body ground Always

Below 1 ohms

2009 Toyota Tundra

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

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

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NG: REPAIR OR REPLACE AIR INJECTION CONTROL DRIVER POWER SOURCE
CIRCUIT

OK: Go to Next Step

6. CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER)

a. Disconnect the A24 or D74 ECM connector.

b. Disconnect the D50 or D54 AID connector.

Fig. 250: Identifying A24 Or D74 ECM With D50 Or D54 AID Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

7. REPLACE AIR INJECTION CONTROL DRIVER

Tester Connection

Condition Specified Condition

D74-28 (AIRV) - D50-3 (SIV)

Always

Below 1 ohms

A24-43 (ARV2) - D54-3 (SIV2) Always

Below 1 ohms

2009 Toyota Tundra

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

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a. Replace the air injection control driver (see REMOVAL ).

8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2440, P2441, P2442 AND/OR P2443)

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 output) (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.

OK:

No pending DTC output.

NG: REPLACE ECM (See REMOVAL )

OK: END

9. INSPECT VACUUM HOSES (AIR SWITCHING VALVE - PRESSURE SENSOR)

OK:

No blockage and no deformation in vacuum hose.

NG: REPAIR OR REPLACE VACUUM HOSE

OK: Go to Next Step

10. INSPECT AIR SWITCHING VALVE (PRESSURE SENSOR) (See INSPECTION PROCEDURE )

NG: REPLACE AIR SWITCHING VALVE (See REMOVAL )

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.

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

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

DESCRIPTION

Refer to P2440 .

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

MONITOR DESCRIPTION

The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the Air
Switching Valve (ASV) of the Secondary Air Injection (AIR) system. The sensor measures the pressure in the
secondary air passage and transmits a signal to the ECM.

If either of the following conditions occurs, the ECM interprets it as a malfunction of the AIR system, and
illuminates the MIL and stores a DTC:



The pressure indicated by the pressure sensor does not reach threshold levels despite the ECM turning on
the air pump.

DTC

DTC Detection Condition

Trouble Area

P2444
P2446

Secondary air pressure more than
2.4 kPa (18 mmHg) despite ECM
commanding air pump to turn off
(2 trip detection logic)



Short in air pump circuit



Open or short in pressure
sensor circuit



Pressure sensor



Air Injection Control Driver
(AID)



ECM

P2445
P2447

Secondary air pressure less than
2.4 kPa (18 mmHg) despite ECM
commanding air pump to turn on
(2 trip detection logic)



Air pump



Open in air pump circuit



Air injection system piping



Vacuum hose (pressure
sensor - air switching valve)



Pressure sensor



Open or short in pressure
sensor circuit



Air Injection Control Driver
(AID)



ECM

2009 Toyota Tundra

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

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

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