Toyota Tacoma 2015-2018 Service Manual: Yaw Rate Sensor Malfunction (C1436)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Yaw Rate Sensor Malfunction (C1436)

DESCRIPTION

The skid control ECU (master cylinder solenoid) receives signals from the yaw rate and acceleration (airbag sensor assembly) via the CAN communication system.

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

If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTCs U0123 (yaw rate sensor communication trouble) and U0124 (acceleration sensor communication trouble) are stored.

These DTCs are also output when calibration has not been completed.

DTC Code	DTC Detection Condition	Trouble Area
C1436	Either condition is met: With the vehicle stationary, the yaw rate and acceleration sensor output value is not 0°/s. An abnormal comparison value.	Yaw rate and acceleration sensor (airbag sensor assembly) Sensor installation

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245 (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform calibration (See page ).
Check the yaw rate and acceleration sensor (airbag sensor assembly) signal after replacement (See page ).

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs (See page Result ).

Result

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	READ VALUE USING TECHSTREAM (YAW RATE SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) 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 and acceleration sensor 1 reading/ Min.: -128°/s, Max.: 127°/s	0°/s: Vehicle stationary -128 to 0°/s: Right turn 0 to 127°/s: Left turn	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Yaw Rate Sensor

Yaw rate and acceleration sensor 1 reading/ Min.: -128°/s, Max.: 127°/s

0°/s: Vehicle stationary

-128 to 0°/s: Right turn

0 to 127°/s: Left turn

(f) Check that the yaw rate and acceleration sensor output value is displayed on the Techstream.

Result

Result		Proceed to
NG	Yaw rate and acceleration sensor output value is 0°/s when vehicle is stationary, but value fluctuates when turning	A
NG	Yaw rate and acceleration sensor output value is not 0°/s when vehicle is stationary	B
OK		C

REPLACE AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK

3.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly) is installed properly (See page OK: ).

OK:

The sensor is tightened to the specified torque.

The sensor is not installed at an angle.

REPLACE AIRBAG SENSOR ASSEMBLY

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

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