Toyota Tundra. Manual — part 1566

Fig. 158: Secondary Air Injection System - Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 159: Secondary Air Injection System - Wiring Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

The diagnostic information output from Air Injection Control Driver (AID) can be confirmed by connecting an
oscilloscope to the diagnostic information terminal of the AID. Reading the waveform while performing the
AIR system intrusive operation provided in the System Check function allows the possible trouble areas to be
narrowed down.

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

2009 Toyota Tundra

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

AID DIAGNOSTIC SIGNAL WAVEFORMS

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 to off when the Air Injection Check operation
finishes.

AID Diagnostic Signal Waveforms

ECM Commands

DTCs

(ECM

Output)

Suspected Trouble Areas

100% Duty

Ratio

Any Secondary Air

Injection (AIR)

System operation

P1613
P1614



Open in diagnostic signal
circuit



Air Injection Control
Driver (AID)



Open in AID BATT circuit



Short between +B and
diagnostic signal circuits

0% Duty

Ratio

AIR System: ON

(Air pump ON,

ASV ON)

P1613
P1614



Open or short in air pump
or Air Switching Valve
(ASV) command signal
circuit (ECM - AID)



Short between diagnostic
signal circuit and body
ground



AID



ECM

0% Duty

Ratio

AIR System: OFF

(Air pump OFF,

ASV OFF)

-

Normal

20% Duty

Ratio

Air Pump: ON

P0418
P0419



Short between air pump
drive circuit and body
ground



Harness and connector
(AID - Pump)



Air pump



AID



ECM

20% Duty Ratio 20%



Open in air pump drive
circuit (AID - Pump)

2009 Toyota Tundra

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

HINT:



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.



Read freeze frame data using the Techstream. Freeze frame data records the engine condition when

20%

Air Pump: OFF

P0418
P0419



Harness and connector
(AID - Pump)



Air pump



AID



ECM

40% Duty

Ratio

ASV: ON

P0412
P0415



Short between ASV drive
circuit and body ground



Harness and connector
(AID - ASV)



ASV



AID



ECM

40% Duty

Ratio

ASV: OFF

P0412
P0415



Open in ASV drive circuit
(AID - ASV)



Harness and connector
(AID - ASV)



AID



ASV



ECM

80% Duty

Ratio

AIR System: OFF

(Air pump OFF,

ASV OFF)

P1613
P1614



AID



ECM

80% Duty

Ratio

AIR System: ON

(Air pump ON,

ASV ON)

-

Normal

Other than above (other than 0, 20,
40, 80 and 100% duty)

-

P1613
P1614



AID



Open in AID ground
circuit

2009 Toyota Tundra

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

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.

1. INSPECT AIR SWITCHING VALVE ASSEMBLY

a. Disconnect the D58 or D59 ASV connector.

Fig. 160: Identifying Terminals Of D58 Or D59 ASV Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPLACE AIR SWITCHING VALVE ASSEMBLY (See REMOVAL )

OK: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (AIR SWITCHING VALVE - BODY GROUND)

a. Disconnect the D58 or D59 ASV connector.

Tester Connection

Condition

Specified Condition

D58-5 (+B) - D58-1 (GNDL)

20°C (68°F)*

4.5 to 5.5 ohms

D59-5 (+BL) - D59-1 (GND)

20°C (68°F)*

4.5 to 5.5 ohms

HINT:
*: Make sure that the air switching valve is at ambient temperature before measuring the
resistance.

2009 Toyota Tundra

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