Lexus IS250 · Service Manual STEERING

C1528

Diagnostic trouble codes

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 Item
 Trouble Area
C1528
 Motor rotation angle sensor malfunction
(e.g. An open, short to ground, or short to B+ in the rotation angle sensor circuit)
  1. Motor rotation angle sensor (built into power steering gear assembly)
  2. Wire harness
  3. Power steering earth wire
  4. Power steering ECU assembly

WIRING DIAGRAM

C106486E03

INSPECTION PROCEDURE


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

  1. 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)

  1. C116654E02
    Disconnect the C2 connector from the power steering gear assembly.

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

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

    Standard resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    C2-1 (RZSN) - C4-7 (RZSN)
    		 Always
    		 Below 1 Ω
    C2-2 (RZG) - C4-1 (RZG)
    		 Always
    		 Below 1 Ω
    C2-3 (RZV) - C4-3 (RZV)
    		 Always
    		 Below 1 Ω
    C2-4 (RZCS) - C4-8 (RZCS)
    		 Always
    		 Below 1 Ω
    C2-1 (RZSN) - Body ground
    		 Always
    		 10 kΩ or higher
    C2-2 (RZG) - Body ground
    		 Always
    		 10 kΩ or higher
    C2-3 (RZV) - Body ground
    		 Always
    		 10 kΩ or higher
    C2-4 (RZCS) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. INSPECT POWER STEERING GEAR ASSEMBLY (MOTOR ROTATION ANGLE SENSOR)

  1. C102954E01
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    C2-1 (RZSN) - C2-2 (RZG)
    		 Always
    		 50 to 140 Ω
    C2-3 (RZV) - C2-2 (RZG)
    		 Always
    		 50 to 140 Ω
    C2-4 (RZCS) - C2-2 (RZG)
    		 Always
    		 15 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 (Click here).



 NG
REPLACE POWER STEERING GEAR ASSEMBLY
OK


4. REPLACE POWER STEERING ECU ASSEMBLY

  1. Replace the power steering ECU assembly (Click here).


NEXT


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

  1. Initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).


NEXT


6. RECONFIRM DTC

  1. Check for DTCs (Click here).

    Result:
    DTC Condition
    		 Proceed to
    DTC is not output
    		 A
    DTC C1528 is output
    		 B

    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 (Click here).



 B
REPLACE POWER STEERING GEAR ASSEMBLY
A

END


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