VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1234, C1472

DTC Code DTC Name
C1234 Yaw Rate Sensor
C1472 Acceleration Sensor

DESCRIPTION

The skid control ECU receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

Tech Tips

If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0123 (Lost Communication with Yaw Rate Sensor Module) is output. When U0123 is output together with C1234 and/or C1472, inspect and repair the trouble areas indicated by U0123 first.

DTCs may be stored if one of the following occurs:

DTC No. DTC Detection Condition Trouble Area
C1234

Any of the following is detected:

  1. The yaw rate sensor offset value is estimated as less than -5.25 deg/s or more than 5.25 deg/s based on offset correction performed when the vehicle is stopped and then the vehicle starts off.

  2. The offset correction did not complete with the vehicle stopped, and the yaw rate sensor offset value is estimated as less than -15 deg/s or more than 15 deg/s based on the offset correction performed while the vehicle is being driven.

  3. The offset correction completed with the vehicle stopped and the yaw rate sensor offset value is less than -7.5 deg/s or more than 7.5 deg/s.

  4. The yaw rate sensor offset value is estimated as less than -7.5 deg/s or more than 7.5 deg/s based on the offset correction performed while the vehicle is being driven.

  5. After the VSC system has started, but before the vehicle starts off, the yaw rate sensor value is less than -30 deg/s or more than 30 deg/s for 5 seconds or more when the vehicle is stopped.

  6. After the VSC system has started, but before the vehicle starts off, the yaw rate sensor value is less than -30 deg/s or more than 30 deg/s for 0.5 seconds or more when the vehicle starts off.

  7. After the VSC system has started, but before the vehicle has started off, as the vehicle starts off, the yaw rate sensor value is less than -30 deg/s or more than 30 deg/s for 0.5 seconds or more.

  8. The yaw rate sensor value is less than -94.75 deg/s or more than 94.75 deg/s for 0.8 seconds or more.

  9. The change of the yaw rate sensor value within 0.04 seconds is abnormal.

  10. The value from the yaw rate sensor is judged as abnormal based on the skid control ECU estimation.

  • Sensor installation

  • Yaw rate and acceleration sensor (Airbag sensor assembly)

  • Yaw rate and acceleration sensor circuit
C1472

Any of the following is detected:

  1. With the vehicle stopped, the internal acceleration value is less than -7 m/s2or more than 7 m/s2for 0.4 seconds or more.

  2. The acceleration sensor offset value is estimated as less than -2.25 m/s2or more than 2.25 m/s2based on the offset correction performed while the vehicle is being driven.

  3. The acceleration sensor value is less than -14.6 m/s2or more than 14.6 m/s2for 0.8 seconds or more.

  • Sensor installation

  • Yaw rate and acceleration sensor (Airbag sensor assembly)

  • Yaw rate and acceleration sensor circuit

WIRING DIAGRAM

A011S5EE01

INSPECTION PROCEDURE

Tech Tips

When U0123 and/or U0126 is output together with C1234 and/or C1472, inspect and repair the trouble areas indicated by U0123 and/or U0126 first Click here.

PROCEDURE

  1. CHECK DTC

    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

    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) the vehicle.

    5. Turn the ignition switch to ON again and check that no CAN communication system DTC is output Click here.

      Result
      Result Proceed to
      CAN communication system DTC is not output. A
      CAN communication system DTC is output. B
    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

    1. Turn the ignition switch off.

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

      OK
      The sensor should be tightened to the specified torque. The sensor should not be tilted.
    NG

    INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

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

      A011UHEE01

    2. Disconnect the yaw rate and acceleration sensor (airbag sensor assembly) connector.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I47-21 (IG2) - Body ground Ignition switch ON 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

    1. Turn the ignition switch off.

      A011UHEE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I47-25 (E1) - Body ground Always Below 1 Ω
      I47-26 (E2) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

      Tech Tips

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here