Dtc C1521 Motor Circuit Malfunction

Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING

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 ItemTrouble Area
C1521Motor overcurrentPower steering ECU assembly
C1522Motor current sensor malfunctionPower steering ECU assembly
C1531ECU internal malfunction (CPU malfunction) is detected.Power steering ECU assembly
C1532ECU internal malfunction (Peripheral circuit malfunction) is detected.Power steering ECU assembly
C1533ECU internal malfunction (Substrate temp sensor malfunction) is detected.Power steering ECU assembly
C1534ECU internal malfunction (EEPROM error) is detected.Power steering ECU assembly
C1554Power source relay malfunction is detected.Power steering ECU assembly
C1555Motor relay malfunction is detected.Power steering ECU assembly

INSPECTION PROCEDURE

1.RECONFIRM DTC

Check for DTCs .

  • 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 .
NG
REPLACE POWER STEERING ECU ASSEMBLY
OK
USE SIMULATION METHOD TO CHECK