Dtc C1523 Motor Circuit Malfunction

Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - POWER STEERING MOTOR)

INSPECT POWER STEERING GEAR ASSEMBLY (POWER STEERING MOTOR)

DTC C1523 Motor Circuit Malfunction

DTC C1524 Motor Circuit Malfunction

DESCRIPTION

The power steering ECU assembly supplies current to the power steering motor through this circuit.

DTC No.DTC Detection ItemTrouble Area
C1523Excessively large current deviation
Wire harness
Power steering motor (built into power steering gear assembly)
Power steering ECU assembly
C1524Voltage error between motor terminals
Wire harness
Power steering motor (built into power steering gear assembly)
Power steering ECU assembly

WIRING DIAGRAM

Dtc C1523 Motor Circuit Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - POWER STEERING MOTOR)
Dtc C1523 Motor Circuit Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the C5 connector from the power steering ECU assembly.

Disconnect the C3 connector from the power steering motor.

Measure the resistance according to the value(s) in the table below.

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    C5-1 (V) - C3-2 (V)AlwaysBelow 1 Ω
    C5-2 (U) - C3-3 (U)AlwaysBelow 1 Ω
    C5-3 (W) - C3-1 (W)AlwaysBelow 1 Ω
    C5-1 (V) - Body groundAlways10 kΩ or higher
    C5-2 (U) - Body groundAlways10 kΩ or higher
    C5-3 (W) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2.INSPECT POWER STEERING GEAR ASSEMBLY (POWER STEERING MOTOR)
Dtc C1523 Motor Circuit Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

Measure the resistance according to the value(s) in the table below.

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    C3-3 (U) - C3-2 (V)AlwaysBelow 1 Ω
    C3-2 (V) - C3-1 (W)AlwaysBelow 1 Ω
    C3-1 (W) - C3-3 (U)AlwaysBelow 1 Ω
    C3-3 (U) - Body groundAlways10 kΩ or higher
    C3-2 (V) - Body groundAlways10 kΩ or higher
    C3-1 (W) - Body groundAlways10 kΩ or higher
  • NOTICE:
If replacing the power steering gear assembly, clear the rotation angle sensor value calibration value, initialize the rotation angle sensor, and calibrate the torque sensor zero point .
  • 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 GEAR ASSEMBLY
OK
REPLACE POWER STEERING ECU ASSEMBLY