Toyota Tundra. Manual — part 942

INSPECTION PROCEDURE

HINT:

When U0123/62, U0124/69 or U0126/63 is output together with C1336/39, inspect and repair trouble areas
indicated by U0123/62, U0124/69 or U0126/63 first.

1. CHECK SENSOR USING TEST MODE PROCEDURE

a. Perform the test mode procedure (See TEST MODE PROCEDURE ).

b. Check if any of the test mode DTCs are recorded.

Result

RESULT TABLE

B: REPAIR SENSORS INDICATED BY OUTPUT DTCS (See DIAGNOSTIC TROUBLE CODE
TABLE )

A: Go To Next Step

2. CHECK YAW RATE SENSOR INSTALLATION

a. Check that the yaw rate sensor has been installed properly (See INSTALLATION ).

OK: The sensor is tightened to the specified torque.

The sensor is not tilted.

NG: INSTALL YAW RATE SENSOR CORRECTLY

OK: Go To Next Step

3. PERFORM DECELERATION SENSOR ZERO POINT CALIBRATION

a. Perform zero point calibration of the deceleration sensor (See CALIBRATION ).

DTC Code

DTC Detection Condition

Trouble Area

C1336/39

When the vehicle is driven
without completion of zero point
calibration.



Skid control ECU



Zero point calibration
incomplete

NOTE:

When replacing the VSC actuator assembly, perform the zero point calibration
(See CALIBRATION ).

Result

Proceed to

DTC (test mode DTC) is not output

A

DTC (test mode DTC) is output

B

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

4. RECONFIRM DTC

a. Clear the DTC (See DTC CHECK/CLEAR ).

b. Start the engine.

c. Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT TABLE

HINT:



The DTC is set if the zero point calibration has not been completed successfully.



End the procedure when the same DTC is not set after completion of the zero point
calibration.

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A : REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

DTC C1340/47: CENTER DIFFERENTIAL LOCK CIRCUIT

DESCRIPTION

When the vehicle is changed to 4WD, VSC control turns off and the VSC OFF indicator illuminates.

DTC DETECTION CONDITION TABLE

WIRING DIAGRAM

Result

Proceed to

DTC is output

A

DTC is not output

B

DTC Code

DTC Detection Condition

Trouble Area

C1340/47

When the terminal IG1 voltage is
between 10 and 14 V, there is an
open in the A.D.D. detection
switch circuit or there is a transfer
mechanical malfunction for 2
seconds or more.



A.D.D. detection switch



A.D.D. detection switch
circuit



4WD control ECU



Transfer

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 83: Identifying Center Differential Lock - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

If the transfer shift actuator cannot change from 2WD to 4WD or 4WD to 2WD, inspect and repair the touch
select 2-4 and high-low system first.

1. INSPECT SKID CONTROL ECU (EXI2 TERMINAL)

a. Disconnect the A17 ECU connector.

b. Turn the ignition switch to ON.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

NOTE:

When replacing the VSC actuator assembly, perform zero point calibration (See
CALIBRATION ).

Tester Connection

Condition

Specified Condition

A17-6 (EXI2) - Body ground

4WD (A.D.D. detection switch

ON)

Below 1.5 V

A17-6 (EXI2) - Body ground

2WD (A.D.D. detection switch

10 to 14 V

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 84: Identifying A17 Skid Control ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 2

OK: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - 4WD CONTROL ECU)

a. Confirm that the skid control ECU connector and 4WD control ECU connector are properly

connected.

b. Disconnect the A17 and A25 ECU connectors.

c. Inspect both the connector case and the terminal for deformation and corrosion.

OK: No deformation or corrosion.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

OFF)

Tester Connection

Condition

Specified Condition

A17-6 (EXI2) - A25-15 (ADD)

Always

Below 1 ohms

A17-6 (EXI2) - Body ground

Always

10 kohms or higher

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra