Toyota Tundra. Manual — part 1568

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 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



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

Ratio

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 PUMP ASSEMBLY

a. Disconnect the D56 or D57 air pump connector.

Fig. 163: Identifying Terminals Of D56 Or D57 Air Pump 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 PUMP ASSEMBLY (See REMOVAL )

OK: Go to Next Step

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

a. Disconnect the D56 or D57 air pump connector.

Fig. 164: Identifying Terminals Of D56 Or D57 Air Pump Connector

Tester Connection Condition Specified Condition

1 - 2

20°C (68°F)

0.44 to 1 ohms

2009 Toyota Tundra

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

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: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (AIR PUMP - AIR INJECTION CONTROL DRIVER)

a. Disconnect the D56 or D57 air pump connector.

b. Disconnect the D48 or D52 AID connector.

Fig. 165: Identifying Terminals Of D48 Or D52 AID Connectors
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 CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR INJECTION CONTROL DRIVER (See REMOVAL )

Tester Connection Condition Specified Condition

D56-1 - Body ground Always

Below 1 ohms

D57-1 - Body ground Always

Below 1 ohms

Tester Connection

Condition Specified Condition

D56-2 - D48-2 (VP)

Always

Below 1 ohms

D57-2 - D52-2 (VP2)

Always

Below 1 ohms

D56-2 or D48-2 (VP) - Body ground

Always

10 kohms or higher

D57-2 or D52-2 (VP2) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

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