Toyota 4Runner: Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)

Toyota 4Runner Service Manual / Brake / 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 receives signals from the yaw rate and acceleration sensor via the CAN communication system.

The yaw rate sensor has a built-in 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 and the CAN communication system, DTCs U0123 (yaw rate sensor communication trouble) and U0124 (acceleration sensor communication trouble) are stored.

The DTCs are also stored when the 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 Master cylinder solenoid (Skid control ECU)
C1336	Zero point calibration of the acceleration sensor is incomplete.

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245 (See page ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the master cylinder solenoid, perform calibration (See page ).

PROCEDURE

1.	CHECK DTC (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs (See page ).

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:

All test mode DTCs are cleared.

END

4.	CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) Turn the ignition switch off.

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

OK:

The sensor is tightened to the specified torque.

The sensor is not installed at an angle.

INSTALL YAW RATE AND ACCELERATION SENSOR 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.: -18.183 m/s2, Max.: 18.183 m/s2	-	Changes continuously during acceleration/deceleration.
Deceleration Sensor2	Acceleration sensor 2/ Min.: -18.183 m/s2, Max.: 18.183 m/s2	-	Changes continuously during acceleration/deceleration.
Yaw Rate Sensor	Yaw rate sensor/ Min.: -128°/s, Max.: 127°/s	Vehicle stationary: 0°/s Right turn: -128 to 0°/s Left turn: 0 to 127°/s	-
Yaw Rate Sensor2	Yaw rate sensor 2/ Min.: -128°/s, Max.: 127°/s	Vehicle stationary: 0°/s Right turn: -128 to 0°/s Left turn: 0 to 127°/s	-

(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:

Check the yaw rate and acceleration sensor signal after replacement (See page ).

REPLACE MASTER CYLINDER SOLENOID

REPLACE YAW RATE AND ACCELERATION SENSOR

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