Toyota Avalon Service & Repair Manual: Malfunction in Yaw Rate Sensor (C1436)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

When the skid control ECU (brake booster with master cylinder assembly) detects improper installation of the yaw rate and acceleration sensor (airbag ECU 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 C1436 is stored.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1436

Malfunction in Yaw Rate Sensor

713

714

Either of the following is detected:

  • With the vehicle stationary, the yaw rate sensor output value is not 0 deg/s.
  • Abnormal comparison value.
  • Yaw rate sensor (airbag ECU assembly) installed improperly
  • Yaw rate sensor (airbag ECU assembly)

Does not come on

VSC DTC

DTC Detection Conditions: C1436 INF Code: 713 or 714
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

The vehicle is stopped.

-

Malfunction Status

The yaw rate and acceleration sensor output value is not 0 deg/s.

-

Abnormal comparison value.

-

Detection Time

-

-

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (YAW RATE SENSOR)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Yaw Rate Sensor

Yaw rate sensor 1

Min.: -128 degrees/s, Max.: 127 degrees/s

Vehicle stationary: 0 degrees/s

Turning right: -128 to 0 degrees/s

Turning left: 0 to 127 degrees/s

-

Yaw Rate Sensor2

Yaw rate sensor 2

Min.: -128 degrees/s, Max.: 127 degrees/s

Vehicle stationary: 0 degrees/s

Turning right: -128 to 0 degrees/s

Turning left: 0 to 127 degrees/s

-

Chassis > ABS/VSC/TRAC > Data List

Tester Display

Yaw Rate Sensor

Yaw Rate Sensor2

(b) Check the yaw rate sensor output value displayed on the Techstream.

Result

Proceed to

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

A

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

B

OK

C

B

REPLACE AIRBAG ECU ASSEMBLY

C

USE SIMULATION METHOD TO CHECK

A

2.

CHECK AIRBAG ECU ASSEMBLY INSTALLATION

(a) Turn the power switch off.

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

Click here

OK:

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

The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

    Steering Angle Sensor Output (C1434)

    Steering Angle Sensor Initialization Incomplete (C1439,C1445)

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