Dtc C1523 Motor Circuit Malfunction

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

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 Item
Trouble Area
C1523
Excessively large current deviation
  1. Wire harness
  2. Power steering motor (built into power steering gear assembly)
  3. Power steering ECU assembly
C1524
Voltage error between motor terminals
  1. Wire harness
  2. Power steering motor (built into power steering gear assembly)
  3. Power steering ECU assembly

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Power Steering.Power Steering System. Dtc C1523 Motor Circuit Malfunction


INSPECTION PROCEDURE

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


    Lexus Is250, Is220D. Gse20 Ale20.Power Steering.Power Steering System. Dtc C1523 Motor Circuit Malfunction

  1. Disconnect the C5 connector from the power steering ECU assembly.

  1. Disconnect the C3 connector from the power steering motor.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C5-1 (V) - C3-2 (V)
    		Always
    		Below 1 Ω
    C5-2 (U) - C3-3 (U)
    		Always
    		Below 1 Ω
    C5-3 (W) - C3-1 (W)
    		Always
    		Below 1 Ω
    C5-1 (V) - Body ground
    		Always
    		10 kΩ or higher
    C5-2 (U) - Body ground
    		Always
    		10 kΩ or higher
    C5-3 (W) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT POWER STEERING GEAR ASSEMBLY (POWER STEERING MOTOR)


    Lexus Is250, Is220D. Gse20 Ale20.Power Steering.Power Steering System. Dtc C1523 Motor Circuit Malfunction

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C3-3 (U) - C3-2 (V)
    		Always
    		Below 1 Ω
    C3-2 (V) - C3-1 (W)
    		Always
    		Below 1 Ω
    C3-1 (W) - C3-3 (U)
    		Always
    		Below 1 Ω
    C3-3 (U) - Body ground
    		Always
    		10 kΩ or higher
    C3-2 (V) - Body ground
    		Always
    		10 kΩ or higher
    C3-1 (W) - Body ground
    		Always
    		10 kΩ or higher
    NOTICE:
    1. 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 (Click here).
    1. 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 GEAR ASSEMBLY
OK

REPLACE POWER STEERING ECU ASSEMBLY