POWER STEERING SYSTEM, Diagnostic DTC:C1521/24, C1531/25, C1532/25, C1533/25, C1534/25

DTC Code DTC Name
C1521/24 Short in Motor Circuit
C1531/25 ECU Malfunction
C1532/25 ECU Malfunction
C1533/25 Temperature Sensor Circuit is Low or High
C1534/25 EEPROM Malfunction

DESCRIPTION

If the power steering ECU assembly stores these DTCs, it will shut off the motor relay circuit (built into the power steering ECU assembly) and stop power assist. However, power assist continues if DTC C1533/25 or C1534/25 is output.

DTC No. DTC Detection Condition Trouble Area
C1521/24 Motor overcurrent Power steering ECU assembly
C1531/25 ECU internal malfunction (CPU malfunction)
C1532/25 ECU internal malfunction (Peripheral circuit malfunction)
C1533/25 ECU internal malfunction (Substrate temperature sensor malfunction)
C1534/25 ECU internal malfunction (EEPROM error)

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced with a new one, perform assist map writing and rotation angle sensor value initialization torque sensor zero point calibration after performing the initialization of the torque sensor zero point value Click here.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs (except C1521/24, C1531/25, C1532/25, C1533/25, C1534/25 DTC) are not output A
      DTCs (except C1521/24, C1531/25, C1532/25, C1533/25, C1534/25 DTC) are output B

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here