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

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PROCEDURE

REPLACE POWER STEERING ECU ASSEMBLY

Replace the power steering ECU assembly.
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Result


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