Toyota Venza: Malfunction in Deceleration Sensor (C0365/28,C1234/34,C1245/32,C1245/45)

Toyota Venza Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Malfunction in Deceleration Sensor (C0365/28,C1234/34,C1245/32,C1245/45)

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.

If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, DTC U0123/62 (Lost Communication with Yaw Rate Sensor Module) is output.

DTC Code	DTC Detection Condition	Trouble Area
C0365/28	Any of the following is detected: Lateral acceleration difference between sensor signal and reference value is large. Offset value of sensor signal is higher than the standard value. Sensor signal is out of range (2.25 m/s2).	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit Sensor installation Brake actuator assembly (Skid control ECU)
C1234/34	Sensor malfunction signal is received from the yaw rate sensor.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit
C1245/32*1	Any of the following is detected: Lateral acceleration difference between sensor signal and reference value is large. Offset value of sensor signal is higher than the standard value. Sensor signal is out of range (10 m/s2 continues for 20 seconds).	Sensor installation Yaw rate and acceleration sensor
C1245/45*2	Any of the following is detected: Lateral acceleration difference between sensor signal and reference value is large. Offset value of sensor signal is higher than the standard value. Sensor signal is out of range (10 m/s2 continues for 20 seconds).	Sensor installation Yaw rate and acceleration sensor

*1: for 2WD

*2: for AWD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

When U0123/62 and/or U0126/63 is output together with C0365/28, C1234/34, C1245/32 and/or C1245/45 inspect and repair the trouble areas indicated by U0123/62 and/or U0126/63 first (See page ).

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page ).

(b) Start the engine.

(c) At a speed of 30 km/h (18 mph) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

(d) Turn the ignition switch to ON again and check that no CAN communication system DTC is output (See page ).

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

INSPECT CAN COMMUNICATION SYSTEM

2.	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 should be tightened to the specified torque.

The sensor should not be tilted.

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY

3.	INSPECT YAW RATE AND ACCELERATION SENSOR (IGA TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(b) Disconnect the yaw rate and acceleration sensor connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
D30-1 (IGA) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor)

REPAIR OR REPLACE HARNESS OR CONNECTOR (IGA CIRCUIT)

4.	INSPECT YAW RATE AND ACCELERATION SENSOR (GNDA TERMINAL)

(a) Turn the ignition switch off.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D30-4 (GNDA) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor)

HINT:

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

REPLACE YAW RATE AND ACCELERATION SENSOR

REPAIR OR REPLACE HARNESS OR CONNECTOR (GNDA CIRCUIT)

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