Power Assist Systems. Dtc C1521 Motor Circuit Malfunction

Steering. Corolla. Zre142 Aze141

Power Assist Systems. Corolla. Zre142 Aze141

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTC

DTC C1521 Motor Circuit Malfunction

DTC C1531 ECU Malfunction

DTC C1532 ECU Malfunction

DTC C1533 ECU Malfunction

DTC C1534 ECU Malfunction

DTC C1554 Power Supply Relay Failure

DESCRIPTION

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

DTC No.	DTC Detection Condition	Trouble Area
C1521	Motor overcurrent	Power steering ECU
C1531	ECU internal malfunction (CPU malfunction)	Power steering ECU
C1532	ECU internal malfunction (Peripheral circuit malfunction)	Power steering ECU
C1533	ECU internal malfunction (Substrate temperature sensor malfunction)	Power steering ECU
C1534	ECU internal malfunction (EEPROM error)	Power steering ECU
C1554	Power source relay circuit malfunction	Power steering ECU

INSPECTION PROCEDURE

NOTICE:

If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration (COROLLA_ZRE142 RM00000275305CX.html).

1.CHECK FOR DTC

Clear the DTCs (COROLLA_ZRE142 RM00000275005OX.html).

Check for DTCs. (COROLLA_ZRE142 RM00000275005OX.html)
OK:
DTC is not output.

REPLACE POWER STEERING ECU (COROLLA_ZRE142 RM000002XN605AX.html)

CHECK INTERMITTENT PROBLEMS