ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1232, C1243, C1245

DTC Code DTC Name
C1232 Acceleration Sensor Stuck Malfunction
C1243 Acceleration Sensor Stuck Malfunction
C1245 Acceleration Sensor Output Malfunction

DESCRIPTION

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

Tech Tips

If there is a malfunction in the bus lines between the acceleration sensor (yaw rate sensor) and the CAN communication system, DTCs U0124 (Lost Communication with Lateral Acceleration Sensor Module) are output. When DTCs U0124 are output together with C1232, C1243 and/or C1245, inspect and repair the trouble areas indicated by U0124 first.

DTCs may be stored if either of the following occurs:


DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1232 Acceleration Sensor Stuck Malfunction At a vehicle speed of 10 km/h (6 mph) or more, the acceleration sensor output value does not change for 30 second or more.

  • Sensor installation

  • Acceleration sensor (yaw rate sensor)

 -
C1243 Acceleration Sensor Stuck Malfunction

Either of the following is detected:


  • While the vehicle speed changes from 30 km/h (19 mph) to 0 km/h (0 mph), the condition in which the value of the acceleration sensor does not change by 0.0294 G or more occurs 16 times or more.

  • Output values of GL1 and GL2 (front and rear, left and right) are outside permitted output range for 60 seconds or more.

  • Sensor installation

  • Acceleration sensor (yaw rate sensor)

 -
C1245 Acceleration Sensor Output Malfunction At a vehicle speed of 30 km/h (19 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.

  • Sensor installation

  • Acceleration sensor (yaw rate sensor)

 -
C1243 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status While the vehicle speed changes from 30 km/h (19 mph) to 0 km/h (0 mph), the condition in which the value of the acceleration sensor does not change by 0.0294 G or more occurs 16 times or more ○ -
Output values of GL1 and GL2 (front and rear, left and right) are outside permitted output range - ○
Detection Time - 60 seconds or more.
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

Note

When replacing the acceleration sensor (yaw rate sensor), perform zero point calibration and store system information.

Click here

Tech Tips

When U0124 is output together with C1232, C1243, and/or C1245, inspect and repair the trouble areas indicated by U0124 first.

Click here

PROCEDURE


  1. CHECK YAW RATE SENSOR INSTALLATION


    1. Check that the acceleration sensor (yaw rate sensor) has been installed properly.

      Click here

      OK
      The sensor is tightened to the specified torque.
      The sensor is not installed in a tilted position.

      Note

      Check the acceleration sensor (yaw rate sensor) signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE YAW RATE SENSOR Click here

    NG

    INSTALL YAW RATE SENSOR CORRECTLY Click here