Toyota Tundra. Manual — part 930

The skid control ECU receives signals from the yaw rate and deceleration sensor via the CAN communication
system.

The yaw rate sensor has a built-in deceleration sensor.

If there is trouble in the bus lines between the yaw rate and deceleration sensor and skid control ECU, DTC
U0123/62 (malfunction in CAN communication with the yaw rate sensor) and U0124/69 (malfunction in CAN
communication with the deceleration sensor) are output.

DTCs C0371/71 and C1279/79 are deleted when the yaw rate and deceleration sensor sends a yaw rate and/or
deceleration signal failure in test mode. DTCs C0371/71 and C1279/79 are using only in test mode.

DTC DETECTION CONDITION TABLE

DTC Code

DTC Detection Condition

Trouble Area

C0371/71

Detected only during test mode



Yaw rate sensor



Yaw rate sensor circuit



Skid control ECU

C1232/32

When any of following conditions
detected:

1. Malfunctions in deceleration

sensor detected through self-
diagnosis.

2. Malfunctions in deceleration

sensor circuit detected.

3. Power supply to deceleration

sensor abnormal (less than
6.5 V or 18 V or more).

4. When ignition switch turned

ON, short between
deceleration sensor power
supply and either ground or
battery.



Yaw rate sensor



Yaw rate sensor circuit



Skid control ECU

C1234/34

Sensor malfunction signal received
from yaw rate sensor



Yaw rate sensor



Yaw rate sensor circuit



Skid control ECU

C1244/44

G sensor forward and backward
operation is malfunctioning (4WD)



Yaw rate sensor



Yaw rate sensor circuit



Skid control ECU

C1279/79

Detected only during test mode



Yaw rate sensor



Yaw rate sensor circuit



Skid control ECU

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

WIRING DIAGRAM

Fig. 48: Identifying Yaw Rate Sensor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

When U0123/62, U0124/69 or U0126/63 is output together with C1232/32, C1234/34 or C1244/44, inspect and
repair the trouble areas indicated by U0123/62, U0124/69 or U0126/63 first.

1. CHECK DTC

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

b. Turn the ignition switch off.

c. Turn the ignition switch to ON again and check that no CAN communication system DTC (s) is

output.

d. Drive the vehicle at a speed of 30 km/h (19 mph) or more and check that no DTCs are output.

Result

RESULT TABLE

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

NOTE:

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

Result

Proceed to

DTC is output (relating to yaw rate and deceleration sensor)

A

DTC is output (relating to CAN communication system)

B

DTC is not output

C

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

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

A: Go To Next Step

2. CHECK YAW RATE SENSOR INSTALLATION

a. Check that the yaw rate sensor has been installed correctly.

Torque: 13 N*m (127 kgf*cm, 9 ft.*lbf)

OK: The sensor is tightened to the specified torque. The sensor is not tilted.

Fig. 49: Locating Yaw Rate Sensor Bolt
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: INSTALL YAW RATE SENSOR CORRECTLY (See INSTALLATION )

OK: Go To Next Step

3. INSPECT YAW RATE SENSOR

a. Remove the 2 nuts of the sensor bracket and yaw rate sensor with the connector connected (See

INSPECTION ).

b. Connect the Techstream to the DLC3.

c. Turn the Techstream on.

d. Select the Data List mode on the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

NOTE:

Do not use an electric impact wrench to tighten the yaw rate and
deceleration sensor bolts because the sensor is sensitive to
vibration.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

e. Place the yaw rate sensor as shown below and turn the sensor to the right and left.

Fig. 50: Identifying Yaw Rate Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. Check that the deceleration value of the deceleration sensor displayed on the Techstream changes.

OK: Deceleration value changes.

NG: REPLACE YAW RATE SENSOR (See REMOVAL )

OK: Go To Next Step

4. CHECK YAW RATE SENSOR TERMINAL VOLTAGE

a. for 2WD:

Disconnect the P15 sensor connector.

b. for 4WD:

Disconnect the P16 sensor connector.

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

Standard Voltage: for 2WD

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Display

Measurement

Item/Range

Normal Condition

Diagnostic Note

Deceleration Sensor 2

Acceleration sensor 2
reading/min.: -1.869 G,
max.: 1.869 G

Approximately -0.13 to
0.13 G while stationary

Reading changes when

vehicle is bounced.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra