VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1234,C1472 and C1474

DTC Code DTC Name
C1234 Yaw Rate Sensor
C1472 Acceleration Sensor
C1474 Forward and Rearward G Sensor

DESCRIPTION

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

The yaw rate sensor has a built-in acceleration sensor.

Tip:

If there is a malfunction in the bus lines between the yaw rate and acceleration sensor (yaw rate sensor) and the CAN communication system, DTC U0123 (Lost Communication with Yaw Rate Sensor Module) is output. When U0123 is output together with C1234, C1472 and/or C1474, inspect and repair the trouble areas indicated by U0123 first.

These DTCs may be stored if one of the following occurs:

  • Yaw rate and acceleration sensor (yaw rate sensor) circuit malfunction.

  • Yaw rate and acceleration sensor (yaw rate sensor) installation abnormality.

  • Yaw rate and acceleration sensor (yaw rate sensor) signal malfunction.

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 sensor

  • Yaw rate sensor circuit

C1472

Any of the following is detected:

  1. With the vehicle stopped, the internal acceleration value is less than -7 m/s2 or more than 7 m/s2 for 0.4 seconds or more.

  2. The acceleration sensor offset value is estimated as less than -2.25 m/s2 or more than 2.25 m/s2 based on the offset correction performed while the vehicle is being driven.

  3. The acceleration sensor value is less than -14.6 m/s2 or more than 14.6 m/s2 for 0.8 seconds or more.

  • Sensor installation

  • Acceleration sensor (yaw rate sensor)

  • Acceleration sensor (yaw rate sensor) circuit

C1474

Any of the following is detected:

  1. The acceleration sensor offset value is estimated as less than -2.25 m/s2 or more than 2.25 m/s2 based on the offset correction performed while the vehicle is being driven.

  2. The acceleration sensor value is less than -14.6 m/s2 or more than 14.6 m/s2 for 3 seconds or more.

  • Sensor installation

  • Acceleration sensor (yaw rate sensor)

  • Acceleration sensor (yaw rate sensor) circuit

WIRING DIAGRAM

C300066E02

CAUTION / NOTICE / HINT

Note:

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

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tip:

When U0123 and/or U0126 is output together with C1234, C1472 and/or C1474, 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 off.

    6. Turn the ignition switch to ON again and check that no CAN communication system DTCs are output (Click here).

    Result

    Result

    Proceed to

    CAN communication system DTCs are not output.

    A

    CAN communication system DTCs are output.

    B

    INSPECT CAN COMMUNICATION SYSTEM

    (Click here)

  2. CHECK YAW RATE SENSOR INSTALLATION

    1. Turn the ignition switch off.

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

      OK

      The yaw rate and acceleration sensor (yaw rate sensor) is tightened to the specified torque.

      The yaw rate and acceleration sensor (yaw rate sensor) is not tilted.

    INSTALL YAW RATE SENSOR CORRECTLY

    (Click here)

  3. CHECK TERMINAL VOLTAGE (IGA TERMINAL)

    1. U123253E01

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

    2. Disconnect the H68 yaw rate and acceleration sensor (yaw rate sensor) 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

      H68-1 (IGA) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

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

      Result

      Result

      Proceed to

      OK

      A

      NG (w/o Stop and Start System)

      B

      NG (w/ Stop and Start System)

      C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGA CIRCUIT)

    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT)

    (Click here)

  4. CHECK HARNESS AND CONNECTOR (GNDA TERMINAL)

    1. U123254E01

      Turn the ignition switch off.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H68-4 (GNDA) - Body ground

      Always

      Below 1 Ω
      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Yaw Rate Sensor))
      Tip:

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

    REPLACE YAW RATE SENSOR

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GNDA CIRCUIT)