ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1234, C1243, C1244, C1245, C1279, C1381

DTC Code DTC Name
C1234 Yaw Rate Sensor
C1243 Deceleration Sensor Stuck
C1244 Open or Short Circuit in Deceleration Sensor Circuit
C1245 Abnormal Output in Deceleration Sensor
C1279 Abnormal Output Voltage in Deceleration Sensor (Test Mode DTC)
C1381 Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor

DESCRIPTION

The skid control ECU assembly receives signals from the yaw rate 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 sensor and the CAN communication system, DTCs U0123 (Lost Communication with Yaw Rate Sensor Module) and U0124 (Lost Communication with Lateral Acceleration Sensor Module) are output.

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

DTC C1279 will be cleared when the yaw rate sensor sends a yaw rate and/or acceleration signal or when Test Mode ends. DTC C1279 is output only in Test Mode.

DTC Code INF Code DTC Detection Condition Trouble Area
C1234 -

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 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 sensors is different. ↑
C1243 311 Sensor (GL1) input stuck malfunction. Acceleration sensor (Yaw rate 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.

  • Acceleration sensor (Yaw rate sensor)

  • Skid control ECU assembly
C1244 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

  • Acceleration sensor (Yaw rate sensor)

  • Yaw rate sensor installation

  • Skid control ECU assembly
C1245 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. Acceleration sensor (Yaw rate sensor)
C1381 315 With sensor power source voltage is 9.5 V or more and vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more.

  • Acceleration sensor (Yaw rate sensor)

  • Acceleration sensor (Yaw rate sensor) power source circuit

  • Skid control ECU assembly
C1279 - Detected only during Test Mode.

  • Yaw rate sensor installation

  • Acceleration sensor (Yaw rate sensor)

WIRING DIAGRAM

B002BGEE02

CAUTION / NOTICE / HINT

Note

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

Tech Tips

When U0123 and/or U0124 is output together with C1234, C1243, C1244, C1245, and/or C1381, inspect and repair the trouble areas indicated by U0123 and/or U0124 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 (for LHD: See page , for RHD: Click here.

    6. Check if DTC C1210 (Zero Point Calibration of Yaw Rate Sensor Undone) or C1336 (Zero Point Calibration of Deceleration Sensor Undone) is output Click here.

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

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    D

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK YAW RATE SENSOR INSTALLATION


    1. Turn the power switch off.

    2. Check that the yaw rate 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 SENSOR CORRECTLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (IG, +B TERMINAL)


    1. B002C3LE01
      Text in Illustration
      *A w/ Tilt Sensor
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

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

    2. Disconnect the yaw rate sensor connector.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N51-4 (IG) - Body ground Power switch on (IG) 11 to 14 V
      N51-6 (+B) - Body ground* Always 11 to 14 V

      • *: w/ Tilt Sensor


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG, +B CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. B002C48E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate 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
      N51-1 (GND) - Body ground Always Below 1 Ω

      Note

      Check the yaw rate 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.


    OK

    REPLACE YAW RATE SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)