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 Vacuum Brake Booster) / Yaw Rate Sensor Malfunction (C1436)

DESCRIPTION

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

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

If there is trouble in the bus lines between the acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is set.

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1436	Yaw Rate Sensor Malfunction	Either of the following is detected: With the vehicle stationary, the yaw rate and acceleration sensor output value is not 0 deg/s. Abnormal comparison value.	Improper yaw rate sensor (Airbag sensor assembly) installation Yaw rate sensor (Airbag sensor assembly)

HINT:

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

CAUTION / NOTICE / HINT

NOTICE:

When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration and store system information (See page HINT: HINT: ).

HINT:

When U0124 and/or U0126 is output together with C1436, inspect and repair the trouble areas indicated by U0124 and/or U0126 first (See page PROCEDURE ).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (YAW RATE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) According to the display on the Techstream, read the Data List.

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

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	-

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

HINT:

If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See page Result Result ).

Result

Result	Proceed to
NG (The yaw rate sensor (airbag sensor 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 sensor assembly) output value is not 0 deg/s when the vehicle is stationary)	B
OK	C

REPLACE AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK

2.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the airbag sensor assembly has been installed properly (See page OK: OK: ).

OK:

The sensor should be tightened to the specified torque.

The sensor should not be installed in a tilted position.

REPLACE AIRBAG SENSOR ASSEMBLY

INSTALL AIRBAG SENSOR ASSEMBLY

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