Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK POWER STEERING EARTH WIRE (POWER STEERING GEAR ASSEMBLY - BODY GROUND)

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

INSPECT POWER STEERING GEAR ASSEMBLY (MOTOR ROTATION ANGLE SENSOR)

REPLACE POWER STEERING ECU ASSEMBLY

INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT

RECONFIRM DTC

DTC C1528 Motor Rotation Angle Sensor Malfunction

DESCRIPTION

The motor rotation angle sensor detects the motor rotation angle and sends this information to the power steering ECU assembly.

DTC No.DTC Detection ItemTrouble Area
C1528Motor rotation angle sensor malfunction
(e.g. An open, short to ground, or short to B+ in the rotation angle sensor circuit)
Motor rotation angle sensor (built into power steering gear assembly)
Wire harness
Power steering earth wire
Power steering ECU assembly

WIRING DIAGRAM

Dtc C1528 Motor Rotation Angle Sensor Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK POWER STEERING EARTH WIRE (POWER STEERING GEAR ASSEMBLY - BODY GROUND)

Check the installation condition of the power steering earth wire connected to the power steering gear assembly.

  • OK:
  • The power steering earth wire is securely installed to the power steering gear assembly and body ground.
NG
REINSTALL POWER STEERING EARTH WIRE
OK
2.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - MOTOR ROTATION ANGLE SENSOR)
Dtc C1528 Motor Rotation Angle Sensor Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the C2 connector from the power steering gear assembly.

Disconnect the C4 connector from the power steering ECU.

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

  • Standard resistance:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    C2-1 (RZSN) - C4-7 (RZSN)AlwaysBelow 1 Ω
    C2-2 (RZG) - C4-1 (RZG)AlwaysBelow 1 Ω
    C2-3 (RZV) - C4-3 (RZV)AlwaysBelow 1 Ω
    C2-4 (RZCS) - C4-8 (RZCS)AlwaysBelow 1 Ω
    C2-1 (RZSN) - Body groundAlways10 kΩ or higher
    C2-2 (RZG) - Body groundAlways10 kΩ or higher
    C2-3 (RZV) - Body groundAlways10 kΩ or higher
    C2-4 (RZCS) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.INSPECT POWER STEERING GEAR ASSEMBLY (MOTOR ROTATION ANGLE SENSOR)
Dtc C1528 Motor Rotation Angle Sensor Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    C2-1 (RZSN) - C2-2 (RZG)Always50 to 140 Ω
    C2-3 (RZV) - C2-2 (RZG)Always50 to 140 Ω
    C2-4 (RZCS) - C2-2 (RZG)Always15 to 45 Ω
  • NOTICE:
  • If replacing the power steering gear assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point .
NG
REPLACE POWER STEERING GEAR ASSEMBLY
OK
4.REPLACE POWER STEERING ECU ASSEMBLY

Replace the power steering ECU assembly .

NEXT
5.INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT

Initialize the rotation angle sensor value and calibrate the torque sensor zero point .

NEXT
6.RECONFIRM DTC

Check for DTCs .

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC C1528 is outputB
  • NOTICE:
  • If replacing the power steering gear assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point .
B
REPLACE POWER STEERING GEAR ASSEMBLY
A
END
LEXUS IS250, IS220d / GSE20 ALE20
POWER STEERING
Lexus IS250 IS220d GSE20 ALE20
ELECTRONIC POWER STEERING SYSTEM