Toyota Tundra. Manual — part 945

Result

RESULT TABLE

HINT:

If the same (DTC C1439/66 and/or C1445/66) is not output again, the DTC may have been stored
due to a temporary loss of the steering angle zero point calibration, such as when the power source
voltage drops.

B: END

A: Go to next step

4. REPLACE STEERING ANGLE SENSOR

a. Replace the steering angle sensor (See STEERING ANGLE SENSOR)

NEXT Go to step 5.

5. PERFORM STEERING ANGLE SENSOR ZERO POINT CALIBRATION

a. Drive the vehicle straight ahead at 40 km/h (25 mph) or more for at least 10 seconds.

b. Check that the centered position of the steering wheel is correctly set while driving straight ahead.

HINT:

If the front wheel alignment and steering position are adjusted as a result of an abnormal centered
position of the steering wheel, acquire the yaw rate and deceleration sensor zero point again after
the adjustments are completed.

OK: The centered position of the steering wheel is correctly set.

NEXT Go to step 6.

6. RECONFIRM DTC

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

b. Start the engine.

c. Drive the vehicle at a speed of 36 km/h (22 mph), turn the steering wheel to the right and left.

d. Check if the same DTCs is output (See DTC CHECK/CLEAR).

Result

RESULT TABLE

Result

Proceed to

DTC is output

A

DTC is not output

B

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

B: END

A: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL)

DTC U0073/94, U0100/65, U0114/27, U0123/62, U0124/69, U0126/63: CONTROL MODULE
COMMUNICATION BUS OFF; LOST COMMUNICATION WITH ECM/PCM; LOST
COMMUNICATION WITH 4-WHEEL DRIVE CLUTCH CONTROL MODULE; LOST
COMMUNICATION WITH YAW RATE SENSOR MODULE; DECELERATION SENSOR
COMMUNICATION CIRCUIT MALFUNCTION; LOST COMMUNICATION WITH STEERING
ANGLE SENSOR MODULE

DESCRIPTION

The skid control ECU exchanges signals with the ECM, steering angle sensor, yaw rate and deceleration sensor,
power steering ECU, main body ECU and combination meter via CAN communication.

DTC DETECTION CONDITIONS TABLE

INSPECTION PROCEDURE

1. RECONFIRM DTC

Result

Proceed to

DTC is output

A

DTC is not output

B

DTC Code

DTC Detection Conditions

Trouble Area

U0073/94

Bus off conditions continue for
approximately 0.8 seconds.

CAN communication system

U0100/65

When CAN signal from ECM is
lost or malfunctioning for 1.2
seconds.

CAN communication system

U0114/27

When CAN signal from 4WD
control ECU is lost or
malfunctioning for 1.2 seconds.



CAN communication system



4WD control ECU

U0123/62

Supplied voltage normal (9.7 V or
more), skid control ECU receives
no yaw rate sensor data for 0.1
seconds.



CAN communication system



Yaw rate and deceleration
sensor

U0124/69

Supplied voltage normal (9.7 V or
more), skid control ECU receives
no yaw rate sensor data for 0.1
seconds.



CAN communication system



Yaw rate and deceleration
sensor

U0126/63

Supplied voltage normal (9.7 V or
more), skid control ECU receives
no steering angle sensor data for
0.1 seconds.

CAN communication system

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

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

b. Check if the same DTC (s) is output (See DTC CHECK/CLEAR ).

Result

RESULT TABLE

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

A: GO TO CAN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

ABS WARNING LIGHT REMAINS ON

DESCRIPTION

If any of the following conditions are detected, the ABS warning light remains on:

1. The ECU connectors are disconnected from the skid control ECU.

2. There is a malfunction in the skid control ECU internal circuit.

3. There is an open or short in the wire harness between the combination meter and the skid control ECU.

HINT:

The Techstream may not be used when there is a malfunction in the skid control ECU.

WIRING DIAGRAM

Result

Proceed to

DTC is output

A

DTC is not output

B

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 89: Identifying ABS Warning Light - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT CAN COMMUNICATION SYSTEM

a. Check if a CAN communication system DTC is output (See DIAGNOSTIC TROUBLE CODE

TABLE ).

Result

NOTE:



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



Make sure the skid control ECU is not in test mode before proceeding.



Before using these procedures, first check other DTCs which may cause
the ABS warning light to remain on.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra