Dtc C1521 Motor Circuit Malfunction

Steering. Lexus Is250, Is220D. Gse20 Ale20
Power Steering. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

INSPECTION PROCEDURE

RECONFIRM DTC

DTC C1521 Motor Circuit Malfunction

DTC C1522 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

DTC C1555 Motor Relay Welding Failure


DESCRIPTION

If the power steering ECU assembly detects these DTCs, it will shut off the motor current sensor, power source relay, motor relay circuit (built into the power steering ECU assembly) and stop power assistance. However, power assistance will continue if DTC C1533 or C1534 is output.

DTC No.
DTC Detection Item
Trouble Area
C1521
Motor overcurrent
Power steering ECU assembly
C1522
Motor current sensor malfunction
Power steering ECU assembly
C1531
ECU internal malfunction (CPU malfunction) is detected.
Power steering ECU assembly
C1532
ECU internal malfunction (Peripheral circuit malfunction) is detected.
Power steering ECU assembly
C1533
ECU internal malfunction (Substrate temp sensor malfunction) is detected.
Power steering ECU assembly
C1534
ECU internal malfunction (EEPROM error) is detected.
Power steering ECU assembly
C1554
Power source relay malfunction is detected.
Power steering ECU assembly
C1555
Motor relay malfunction is detected.
Power steering ECU assembly

INSPECTION PROCEDURE

1.RECONFIRM DTC

  1. Check for DTCs (Click here).

    OK:
    DTCs are not output.
    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).


NG
REPLACE POWER STEERING ECU ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK