ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/o Vacuum Brake Booster), Diagnostic DTC:C1234, C1243, C1244, C1245

DTC Code DTC Name
C1234 Yaw Rate Sensor
C1243 Acceleration Sensor Stuck Malfunction
C1244 Open or Short Circuit in Deceleration Sensor Circuit
C1245 Acceleration Sensor Output Malfunction

DESCRIPTION

The skid control ECU assembly receives signals from the yaw rate sensor via CAN communication.

The yaw rate sensor detects the vehicle condition using 2 circuits (GL1, GL2).

If there are malfunctions 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) will be stored.

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

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1234 Yaw Rate Sensor

333

334

335

337

  • INF Code: 333


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 1 (GL1) malfunction).

  • INF Code: 334


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 2 (GL2) malfunction).

  • INF Code: 335


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Zero point calibration malfunction).

  • INF Code: 337


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Two-value comparison malfunction).

  • INF Code: 333, 334, 335, 337


    • Yaw rate sensor internal malfunction

 -
C1243 Acceleration Sensor Stuck Malfunction

311

312

317

323

  • INF Code: 311


    • A stuck acceleration sensor (GL1) value is determined.

  • INF Code: 312


    • A stuck acceleration sensor (GL2) value is determined.

  • INF Code: 317


    • An acceleration sensor malfunction occurs 16 times or more when the vehicle speed drops from above 30 km/h (19 mph) to 0 km/h (0 mph).

  • INF Code: 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.

  • INF Code: 311, 312


    • Acceleration sensor (yaw rate sensor) internal stuck malfunction

  • INF Code: 317, 323


    • Acceleration sensor (yaw rate sensor) internal stuck malfunction

    • Skid control ECU assembly

 -
C1244 Open or Short Circuit in Deceleration Sensor Circuit 314

Either of the following is detected:


  1. Difference between GL1 and GL2 does not become less than 0.4 G for 60 seconds or more after reaching 0.6 G when the vehicle is stopped.

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

  • Zero point calibration undone

  • Acceleration sensor (yaw rate sensor) installed improperly

  • Acceleration sensor (yaw rate sensor)

  • Skid control ECU assembly

 -
C1245 Acceleration Sensor Output Malfunction 313 At a vehicle speed of 30 km/h (19 mph) or more, difference between longitudinal G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more. Acceleration sensor (yaw rate sensor) internal malfunction -
DTC Detection Conditions: C1244 INF Code: 314
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Vehicle is stopped ○ -
Malfunction Status After the difference between GL1 and GL2 becomes 0.6 G or more, it does not drop below 0.4 G ○ -
Acceleration sensor malfunction signal is received - ○
Detection Time 60 seconds or more -
Number of Trips 1 trip 1 trip

CAUTION / NOTICE / HINT

Note

When replacing the yaw rate sensor, perform initialization and calibration of the linear solenoid valve.

Click here

Tech Tips

When U0123 and/or U0124 is output together with C1234, C1243, C1244, and/or C1245, inspect and repair the trouble areas indicated by U0123 and/or U0124 first.

Click here

PROCEDURE


  1. CHECK YAW RATE SENSOR INSTALLATION


    1. Turn the engine switch off.

    2. Check that the yaw rate sensor has been installed properly.

      Click here

      OK
      The yaw rate sensor is tightened to the specified torque.
      The yaw rate sensor is not tilted.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL YAW RATE SENSOR CORRECTLY Click here

    OK

  2. REPLACE YAW RATE SENSOR


    1. Replace the yaw rate sensor.

      Click here

      Note

      Check the yaw rate sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    ZERO POINT CALIBRATION OF YAW RATE SENSOR Click here