Toyota CH-R 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1436

Yaw Rate Sensor Malfunction

Difference between the yaw rate sensor value and the control value estimated inside the skid control ECU (brake actuator assembly) is abnormal.

  • Sensor installation
  • Yaw rate sensor (airbag sensor assembly)

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) Select the Data List using the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > Data List

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

-

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Yaw Rate Sensor

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

Result

Proceed to

NG (The yaw rate and acceleration sensor (airbag sensor assembly) output value is 0 °/s when the vehicle is stationary, but the value fluctuates when turning.)

A

NG (The yaw rate and acceleration sensor (airbag sensor assembly) output value is not 0 °/s when the vehicle is stationary.)

B

OK

C

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

Click here

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 50 km/h (31 mph) or more for at least 30 seconds.

(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.

Click here

OK:

The airbag sensor assembly is tightened to the specified torque.

The airbag sensor assembly is not be installed in a tilted position.

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

Click here

OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

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