Toyota Tundra Service Manual: Yaw Rate Sensor Malfunction (C1436)

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) detects improper installation of the yaw rate and acceleration sensor (airbag sensor assembly) or an abnormality in the difference between the yaw rate sensor value and the control value estimated based on the acceleration sensor, steering angle sensor and speed sensor signals.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1436

Yaw Rate Sensor Malfunction

Either of the following is detected:

  • Difference between the yaw rate sensor value and the control value estimated inside the skid control ECU (brake actuator assembly) is abnormal.
  • With the vehicle stationary, the yaw rate and acceleration sensor output value is not 0 deg/s.
  • Sensor installation
  • Yaw rate sensor (airbag sensor assembly)

CAUTION / NOTICE / HINT

NOTICE:

After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform system variant learning and acceleration sensor zero point calibration.

Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Yaw Rate Sensor

Yaw rate sensor

Min.: -128°/s, Max.: 127°/s

Vehicle stopped: 0°/s

Turning right: -128 to 0°/s

Turning left: 0 to 127°/s

-

(d) Check the yaw rate and acceleration sensor (airbag sensor assembly) output value displayed on the Techstream.

Result

Proceed to

The value of Yaw Rate Sensor is 0°/s when the vehicle is stopped and the output value fluctuate when the vehicle turning right or left

A

The value of Yaw Rate Sensor is not 0°/s when the vehicle is stopped

B

The value of Yaw Rate Sensor is 0°/s when the vehicle is stopped and the output value does not fluctuate when the vehicle turning right or left

C

B

REPLACE AIRBAG SENSOR ASSEMBLY

C

USE SIMULATION METHOD TO CHECK

A

2.

CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

(a) Turn the ignition switch off.

(b) Drive the vehicle straight ahead at 15 km/h (9 mph) or more for at least 1 second.

(c) Check that the steering wheel is correctly centered while driving straight ahead.

HINT:

If front wheel alignment and steering are adjusted as a result of an off-center steering wheel, acquire the yaw rate and acceleration sensor zero point again after the adjustments are completed.

OK:

The steering wheel is correctly centered.

NG

ADJUST FRONT WHEEL ALIGNMENT OR STEERING

OK

3.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

for Column Shift Type: Click here

for Floor Shift Type: Click here

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.

OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

    Steering Angle Sensor Output Malfunction (C1434)

    Steering Angle Sensor Initialization Incomplete (C1439,C1445)

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