ACTIVE STABILIZER SUSPENSION SYSTEM, Diagnostic DTC:C1914

DTC Code DTC Name
C1914 DC / DC Converter Overload

DESCRIPTION

If the rear active stabilizer control ECU receives an overheat signal from the power steering converter, control is stopped to protect the power steering converter from overheating, and DTC C1914 is output. The power steering converter sends its condition information from terminal WDD1 to the power steering ECU, and from terminal WDD3 to the rear active stabilizer control ECU. The power steering converter supplies power to the front active stabilizer control actuator assembly, rear active stabilizer control actuator assembly and power steering system. As a result, extensive steering, such as rotating the steering wheel from lock to lock for dozens of times with the vehicle stationary, may be causing the power steering converter to overheat. If the temperature returns to normal, the system returns to normal operation.

DTC No. DTC Detection Condition Trouble Area
C1914 Rear active stabilizer control ECU receives power steering converter overheat signal and approximately 30 minutes have elapsed

  • Overheat in area around power steering converter

  • Rear active stabilizer control ECU

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (DC/DC CONVERTER WDD3 OUTPUT)


    1. In order for the converter to cool down, turn the power switch off and wait 30 minutes or more.

      Tech Tips

      While waiting, check if there are factors that may be causing high temperatures around the power steering converter, and take measures to eliminate those factors.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (READY) and the intelligent tester on.

    4. Follow the intelligent tester screen display and display the rear active stabilizer Data List screen. Select the "DC/DC Status" item and check the output condition of terminal WDD3 Click here.

      Rear Stabilizer
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      DC/DC Status

      Power steering converter condition information /

      min.: 0 ms

      max.: 102.4 ms

      		 30 ms

      15 ms: DTC C1914 is output

      22 ms: DTC C1915 and/or C1920 is output

      24 ms: DTC C1914 is output
      Result
      Result Proceed to
      For 30 minutes or more, 15 ms or 24 ms is displayed A
      Within 30 minutes, display changes to 30 ms B

    B

    RETURNS TO NORMAL OPERATION (SYSTEM RETURNS TO NORMAL DUE TO RETURN OF POWER STEERING CONVERTER TO NORMAL TEMPERATURE)

    A

  2. INTERCHANGE FRONT AND REAR ACTIVE STABILIZER CONTROL ECU


    1. Turn the power switch off.

    2. Interchange the rear active stabilizer control ECU with the front active stabilizer control ECU, and install them securely Click here.


    NEXT

  3. CLEAR DTC


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG) and the intelligent tester on.

    4. Clear the DTC Click here.


    NEXT

  4. CHECK REAR ACTIVE STABILIZER CONTROL ECU


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (READY) and wait 30 seconds or more. Then check for front active stabilizer DTCs Click here.

      OK
      DTC C1914 is not output

    NG

    REPLACE POWER STEERING CONVERTER ASSEMBLY Click here

    OK

    REPLACE ACTIVE STABILIZER CONTROL ECU ASSEMBLY Click here