Yaw Rate Sensor Malfunction - Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1234/34,C0371/71,C1243/43-C1245/45,C1279/79,C1381/97: Yaw Rate Sensor Malfunction
C1381/97 - Acceleration Sensor Power Supply Voltage Malfunction

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, the DTC U0123/62 (Lost Communication with Yaw Rate Sensor Module) and U0124/95 (Lost Communication with Lateral Acceleration Sensor Module) are output.

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

DTCs C0371/71 and C1279/79 will be cleared when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or when Test Mode ends. DTCs C0371/71 and C1279/79 are output only in the Test Mode.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the yaw rate and acceleration sensor, perform zero point calibration Calibration.

HINT
When U0123/62 and/or U0124/95 is output together with C1234/34, C1243/43, C1244/44, C1245/45 or C1381/97, inspect and repair the trouble areas indicated by U0123/62 and/or U0124/95 first U0073.

PROCEDURE

1. CHECK DTC

(a) Clear the DTCs Electronically Controlled Brake System.

(b) Turn the engine switch off.

(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).

(d) Turn the engine switch on (IG) again and check that no CAN communication system DTC is output Diagnosis System.

(e) Check if DTC C1210/36 (Zero Point Calibration of Yaw Rate Sensor Undone) or C1336/98 (Zero Point Calibration of Acceleration Sensor Undone) is output Electronically Controlled Brake System.

Result:





C -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Electronically Controlled Brake System

B -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) Turn the engine switch off.

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

OK:

The sensor is installed to the specified torque.

The sensor is not tilted.

NG -- INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY
OK -- Continue to next step.

3. INSPECT YAW RATE AND ACCELERATION SENSOR (IG 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.

(c) Turn the engine switch on (IG).

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)
OK -- Continue to next step.

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

(a) Turn the engine switch off.





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

Standard Resistance:





NOTICE:
Check the yaw rate and acceleration sensor signal after replacement Electronically Controlled Brake System.

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

OK -- REPLACE YAW RATE AND ACCELERATION SENSOR