POWER STEERING SYSTEM(for Power Tilt and Power Telescopic Steering Column), Diagnostic DTC:C1521/24, C1522/24, C1523/24, C1524/24, C1528/12, C1531/25, C1532/25, C1533/25, C1534/25, C1555/25

DTC Code DTC Name
C1521/24 Short in Motor Circuit
C1522/24 Power Supply Sensor
C1523/24 Current Deviation Excessive
C1524/24 Motor Terminal Voltage Malfunction
C1528/12 Motor Rotation Angle Sensor Malfunction
C1531/25 ECU Malfunction
C1532/25 ECU Malfunction
C1533/25 Temperature Sensor Circuit is Low or High
C1534/25 EEPROM Malfunction
C1555/25 Motor Relay Welding Failure

DESCRIPTION

The power steering ECU assembly detects steering force using the signal received from the steering torque sensor, and also monitors the motor circuit for errors.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note
C1521/24 Short in Motor Circuit Motor overcurrent Power steering ECU assembly On Engine switch on (IG) again -
C1522/24 Power Supply Sensor Motor current sensor malfunction Power steering ECU assembly On Engine switch on (IG) again -
C1523/24 Current Deviation Excessive Excessively large current deviation Power steering ECU assembly On Engine switch on (IG) again -
C1524/24 Motor Terminal Voltage Malfunction Short (or open) in motor circuit or abnormal voltage or current in motor circuit Power steering ECU assembly On Engine switch on (IG) again -
C1528/12 Motor Rotation Angle Sensor Malfunction Motor rotation angle sensor malfunction Power steering ECU assembly On Engine switch on (IG) again -
C1531/25 ECU Malfunction

ECU internal malfunction

(CPU malfunction)

 Power steering ECU assembly On Engine switch on (IG) again -
C1532/25 ECU Malfunction

ECU internal malfunction

(Peripheral circuit malfunction)

 Power steering ECU assembly On Engine switch on (IG) again -
C1533/25 Temperature Sensor Circuit is Low or High

ECU internal malfunction

(Substrate temperature sensor malfunction)

 Power steering ECU assembly Off After normal confirmation -
C1534/25 EEPROM Malfunction

ECU internal malfunction

(EEPROM error)

 Power steering ECU assembly Torque sensor zero point adjustment is set to the default value and control is continued. In this case, the warning light illuminates. Engine switch on (IG) again -
C1555/25 Motor Relay Welding Failure Motor relay circuit malfunction Power steering ECU assembly On Engine switch on (IG) again -

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Chassis > EMPS > Clear DTCs

    2. Check for DTCs.

      Click here


      Chassis > EMPS > Trouble Codes
      Result
      Result Proceed to
      DTCs (except C1521/24, C1522/24, C1523/24, C1524/24, C1528/12, C1531/25, C1532/25, C1533/25, C1534/25 and C1555/25 DTC) are not output. A
      DTCs (except C1521/24, C1522/24, C1523/24, C1524/24, C1528/12, C1531/25, C1532/25, C1533/25, C1534/25 and C1555/25 DTC) are output. B

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here