POWER STEERING SYSTEM, Diagnostic DTC:C1521, C1522, C1523, C1524, C1528, C1531, C1532, C1533, C1534, C1555

DTC Code DTC Name
C1521 Short in Motor Circuit
C1522 Power Supply Sensor
C1523 Current Deviation Excessive
C1524 Motor Terminal Voltage
C1528 Motor Rotation Angle Sensor
C1531 ECU Malfunction
C1532 ECU Malfunction
C1533 Temperature Sensor Circuit is Low or High
C1534 EEPROM
C1555 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 Short in Motor Circuit Motor overcurrent Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1522 Power Supply Sensor Motor current sensor malfunction Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1523 Current Deviation Excessive Excessively large current deviation Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1524 Motor Terminal Voltage Short (or open) in motor circuit or abnormal voltage or current in motor circuit Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1528 Motor Rotation Angle Sensor Motor rotation angle sensor malfunction Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1531 ECU Malfunction

ECU internal malfunction

(CPU malfunction)

 Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1532 ECU Malfunction

ECU internal malfunction

(Peripheral circuit malfunction)

 Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -
C1533 Temperature Sensor Circuit is Low or High

ECU internal malfunction

(Substrate temperature sensor malfunction)

 Power steering ECU assembly EPS Warning Light: Does not come on Ignition switch ON again -
C1534 EEPROM

ECU internal malfunction

(EEPROM error)

 Power steering ECU assembly EPS Warning Light: Torque sensor zero point adjustment is set to the default value and control is continued. In this case, the warning light illuminates. Ignition switch ON again -
C1555 Motor Relay Welding Failure Motor relay circuit malfunction Power steering ECU assembly EPS Warning Light: Comes on Ignition switch ON again -

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. REPLACE POWER STEERING ECU ASSEMBLY


    1. Replace the power steering ECU assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END