ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1234/34, C1243/43, C1244/44, C1245/45, C1279/79, C1381/97, C1473/71

DTC Code DTC Name
C1234/34 Yaw Rate Sensor Malfunction
C1243/43 Acceleration Sensor Stuck Malfunction
C1244/44 Open or Short in Deceleration Sensor Circuit
C1245/45 Acceleration Sensor Output Malfunction
C1279/79 Deceleration Sensor Output Voltage Malfunction (Test Mode DTC)
C1381/97 Acceleration Sensor Power Supply Voltage Malfunction
C1473/71 Yaw Rate Sensor (Test Mode DTC)

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 C1279/79 and C1473/71 can be deleted when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or the Test Mode ends. DTCs C1279/79 and C1473/71 are output only in the Test Mode.

DTC Code Information Code DTC Detection Condition Trouble Area
C1234/34 - Signal of malfunction that is detected at sensor self-check is received when communication with the sensors is valid. Yaw rate and acceleration sensor
↑ 333 Yaw rate sensor malfunction (GL1 circuit) ↑
↑ 334 Yaw rate sensor malfunction (GL2 circuit) ↑
↑ 335 Yaw rate sensor zero point malfunction ↑
↑ 337 2 yaw rate sensors (GL1, GL2) malfunction ↑
C1243/43

311

312

317

 Sensor sticking can be seen 16 times or more in a row at a speed between 30 km/h (18 mph) or more and 0 km/h (0 mph).

  • Yaw rate and acceleration sensor

  • Skid control ECU
↑ 323 The values of both GL1 and GL2 are 1.4 G or more or -1.4 G or less for 60 seconds or more. ↑
C1244/44 314

When either of the following conditions is detected:


  1. Both of the following conditions continue for at least 60 seconds.


    • Vehicle is stopped.

    • Difference between GL1 and GL2 does not drop below 0.4 G after it reaches 0.6 G or more.

  2. Data malfunction signal is received from acceleration sensor.

  • Zero point calibration undone

  • Sensor installation

  • Yaw rate and acceleration sensor

  • Skid control ECU
C1245/45 313

When the following condition continues for at least 60 seconds:


  • At a vehicle speed of 30 km/h (19 mph) or more, the difference between the forward and backward G calculated from the G sensor and that calculated from the vehicle speed sensors exceeds 0.35 G.

  • Yaw rate and acceleration sensor

  • Yaw rate and acceleration sensor circuit

  • Skid control ECU
C1381/97 315 IG1 terminal voltage is 9.5 V or more, acceleration sensor power source malfunction signal is received for at least 10 seconds at a speed of more than 3 km/h (2 mph).

  • Yaw rate and acceleration sensor

  • Yaw rate and acceleration sensor power source circuit

  • Skid control ECU
C1279/79 - Detected only during test mode.

  • Yaw rate sensor

  • Yaw rate sensor circuit
C1473/71 - Detected only during test mode.

  • Yaw rate sensor

  • Yaw rate sensor circuit

WIRING DIAGRAM

A01GXT3E04

INSPECTION PROCEDURE

Note

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

Tech Tips

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


    1. Clear the DTC Click here.

    2. Turn the power switch OFF.

    3. Turn the power switch ON (READY).

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

    5. Check that no CAN communication system DTC is output (for LHD: Click here /for RHD: Click here.

    6. 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
      Result Proceed to
      DTCs (C1210/36, C1336/98, and CAN communication system malfunction) are not output. A
      CAN communication system DTC is output. for LHD B
      for RHD C
      C1210/36 and C1336/98 are output. D

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    D

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE Click here

    A

  2. CHECK YAW RATE SENSOR INSTALLATION


    1. Check that the yaw rate sensor has been installed properly Click here.

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

    NG

    INSTALL YAW RATE SENSOR CORRECTLY Click here

    OK

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


    1. A01GWBIE01

      Disconnect the L71 sensor connector.

    2. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L71-4 (IG) - Body ground Power switch ON (IG) 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L71-1 (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 the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE YAW RATE SENSOR Click here