Dtc C1521 Motor Circuit Malfunction

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Power Steering. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

INSPECT POWER STEERING LINK ASSEMBLY (POWER STEERING MOTOR)

DTC C1521 Motor Circuit Malfunction

DTC C1522 Motor Circuit Malfunction

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
C1521
Motor overcurrent
  1. Wire harness or connector
  2. Power steering motor (built into power steering link assembly)
  3. Power steering ECU assembly
C1522
Motor current sensor malfunction
  1. Wire harness or connector
  2. Power steering motor (built into power steering link assembly)
  3. Power steering ECU assembly
C1523
Excessively large current deviation
  1. Wire harness or connector
  2. Power steering motor (built into power steering link assembly)
  3. Power steering ECU assembly
C1524
Voltage error between motor terminals
  1. Wire harness or connector
  2. Power steering motor (built into power steering link assembly)
  3. Power steering ECU assembly

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Power Steering.Power Steering System. Dtc C1521 Motor Circuit Malfunction


INSPECTION PROCEDURE

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


    Lexus Gs430, Gs300. Uzs190 Grs190.Power Steering.Power Steering System. Dtc C1521 Motor Circuit Malfunction

  1. Disconnect the C4 connector from the power steering ECU assembly.

  1. Disconnect the C1 connector from the power steering motor.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    C4-5 (U) - C1-3 (U)
    		Always
    		Below 1 Ω
    C4-11 (V) - C1-2 (V)
    		Always
    		Below 1 Ω
    C4-6 (W) - C1-1 (W)
    		Always
    		Below 1 Ω
    C4-5 (U) - Body ground
    		Always
    		10 kΩ or higher
    C4-11 (V) - Body ground
    		Always
    		10 kΩ or higher
    C4-6 (W) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Lexus Gs430, Gs300. Uzs190 Grs190.Power Steering.Power Steering System. Dtc C1521 Motor Circuit Malfunction

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    C1-3 (U) - C1-2 (V)
    		Always
    		Below 1 Ω
    C1-2 (V) - C1-1 (W)
    		Always
    		Below 1 Ω
    C1-1 (W) - C1-3 (U)
    		Always
    		Below 1 Ω
    NOTICE:
    1. If replacing the power steering link assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor, and calibrate the torque sensor zero point (Click here).
    2. If replacing the power steering ECU assembly, initialize the rotation angle sensor and calibrate the torque sensor zero point (Click here).
    3. 3UZ-FE:
      If replacing the power steering link assembly, perform VGRS actuator angle initialization and VGRS actuator angle neutral calibration after wheel alignment adjustment (Click here for INITIALIZATION, Click here for CALIBRATION).


NG
REPLACE POWER STEERING LINK ASSEMBLY
OK

REPLACE POWER STEERING ECU ASSEMBLY