C0371

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1234/34,C0371/71,C1243/43-C1245/45,C1279/79,C1381/97: Yaw Rate Sensor 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 (malfunction in CAN communication with yaw rate sensor) and U0124/95 (malfunction in CAN communication with acceleration sensor) are output.

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

DTCs C0371/71 and C1279/79 can be deleted when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or the 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
If a CAN communication malfunction DTC and a related sensor malfunction DTC are output at the same time, the CAN communication malfunction must be repaired before troubleshooting the sensor malfunction DTC.

PROCEDURE

1. CHECK DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the power switch OFF.

(c) Turn the power switch ON (READY).

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

(e) Check that no CAN communication system DTC is output CAN Communication System.

(f) Check that no DTCs for zero point calibration of the yaw rate sensor undone (C1210/36) and for zero point calibration of the acceleration sensor undone (C1336/98) are output.

Result





C -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE Electronically Controlled Brake System

B -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) 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 Installation
OK -- Continue to next step.

3. CHECK TERMINAL VOLTAGE AND RESISTANCE (IG, GND)

(a) Disconnect the L71 sensor connector.





(b) Turn the power switch ON (IG).

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

Standard voltage:





(d) 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 Test Mode Procedure.

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

OK -- REPLACE YAW RATE AND ACCELERATION SENSOR Removal