Toyota Tacoma 2015-2018 Service Manual: Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)

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
C1210	Zero point calibration of the yaw rate sensor is incomplete.	Zero point calibration incomplete Sensor installation Yaw rate and acceleration sensor (airbag sensor assembly) Skid control ECU (master cylinder solenoid)
C1336	Zero point calibration of the acceleration sensor is incomplete.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (master cylinder solenoid), perform calibration (See page ).
When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration (See page )
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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.	PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(a) Perform zero point calibration of the yaw rate and acceleration sensor (See page ).

3.	PERFORM TEST MODE (SIGNAL CHECK)

(a) Turn the ignition switch off.

(b) Perform the signal check in the Test Mode Procedure (See page OK: OK: ).

OK:

All test mode DTCs are cleared.

END

4.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the ignition switch off.

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

OK:

The sensor is tightened to the specified torque.

The sensor is not installed at an angle.

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

5.	READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION 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
Deceleration Sensor	Acceleration sensor/ Min.: -18.525 m/s2, Max.: 18.387 m/s2	-	Changes continuously during acceleration/deceleration.
Deceleration Sensor2	Acceleration sensor 2/ Min.: -18.525 m/s2, Max.: 18.387 m/s2	-	Changes continuously during acceleration/deceleration.
Yaw Rate Sensor	Yaw rate sensor/ 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

Deceleration Sensor

Acceleration sensor/ Min.: -18.525 m/s2, Max.: 18.387 m/s2

Changes continuously during acceleration/deceleration.

Deceleration Sensor2

Acceleration sensor 2/ Min.: -18.525 m/s2, Max.: 18.387 m/s2

Changes continuously during acceleration/deceleration.

Yaw Rate Sensor

Yaw rate sensor/ 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.

OK:

The yaw rate and acceleration sensor output value is normal.

NOTICE:

The yaw rate and acceleration sensor (airbag sensor assembly) output value is normal (See page ).

REPLACE MASTER CYLINDER SOLENOID

REPLACE AIRBAG SENSOR ASSEMBLY

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