ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C0371/71, C1234/34, C1243/43, C1244/44, C1245/45, C1279/79, C1381/97

DTC Code DTC Name
C0371/71 Yaw Rate Sensor (Test Mode DTC)
C1234/34 Yaw Rate Sensor Malfunction
C1243/43 Acceleration Sensor Stuck Malfunction
C1244/44 Open or Short in Acceleration Sensor Circuit
C1245/45 Acceleration Sensor Output Malfunction
C1279/79 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)
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 are any problems in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, DTCs 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 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 Test Mode.

DTC Code INF Code DTC Detection Condition Trouble Area
C1234/34 -

Either of the following is detected:


  1. Signal of malfunction that is detected at sensor self-check is received when communication with the sensors is valid.

  2. Yaw rate sensor (GL1 or GL2 circuit) open or short.

 Yaw rate and acceleration sensor
↑ 333 Yaw rate sensor circuit 1 malfunction ↑
↑ 334 Yaw rate sensor circuit 2 malfunction ↑
↑ 335 Yaw rate sensor zero point malfunction ↑
↑ 337 The output of two yaw rate sensor in different. ↑
C1243/43 311 Sensor (GL1) input stuck malfunction. Yaw rate and acceleration sensor
↑ 312 Sensor (GL2) input stuck malfunction. ↑
↑ 317 While the vehicle speed changes from over 30 km/h (18 mph) to 0 km/h (0 mph), the values of GL1 and GL2 do not change 16 times or more.

  • Yaw rate and acceleration sensor

  • Skid control ECU
C1244/44 314

Either of the following is detected:


  1. A malfunction signal is received from the acceleration sensor.

  2. After the difference between GL1 and GL2 becomes 0.6 G or more with the vehicle stationary, the difference remains greater than 0.4 G for 60 seconds or more.

  • Zero point calibration undone

  • Yaw rate and acceleration sensor

  • Sensor installation

  • Skid control ECU
C1245/45 313 At a vehicle speed of 30 km/h (18 mph) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed sensor exceeds 0.35 G for 60 seconds or more. Yaw rate and acceleration sensor
C1381/97 315 At a vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more.

  • Yaw rate and acceleration sensor

  • Yaw rate and acceleration sensor power source circuit

  • Skid control ECU
C0371/71 - Detected only during Test Mode.

  • Sensor installation

  • Yaw rate and acceleration sensor
C1279/79 - Detected only during Test Mode.

  • Sensor installation

  • Yaw rate and acceleration sensor

WIRING DIAGRAM

A01NHBDE01

INSPECTION PROCEDURE

Note

When replacing the yaw rate and acceleration sensor, perform zero point calibration Click here.

Tech Tips

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

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs Click here.

    2. Turn the power switch off.

    3. Turn the power switch on (READY).

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

    5. Turn the power switch on (IG) again and check that no CAN communication system DTC is output Click here.

    6. 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 Click here.

      Result
      Result Proceed to
      DTCs (C1210/36, C1336/98 and CAN communication system DTC) are not output A
      CAN communication system DTC is output B
      DTCs (C1210/36 and/or C1336/98) are output C

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION


    1. Turn the power switch off.

    2. Check that the yaw rate and acceleration sensor has been installed properly Click here.

      OK
      The sensor is tightened to the specified torque.
      The sensor is not tilted.

    NG

    INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY Click here

    OK

  3. INSPECT YAW RATE AND ACCELERATION SENSOR (POWER SOURCE TERMINAL)


    1. A01NHY9E64
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor)

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

    2. Disconnect the yaw rate and acceleration sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F28-4 (IG) - Body ground Power switch on (IG) 11 to 14 V
      F28-6 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

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


    1. A01NHY9E57
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor)

      Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F28-1 (GND) - Body ground Always Below 1 Ω

      Note

      Check the yaw rate and acceleration sensor signal after replacement Click here.

      Tech Tips

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

    REPLACE YAW RATE AND ACCELERATION SENSOR Click here