RX400h · Service Manual STEERING

C1528 Motor rotation angle sensor malfunction (e.g. An open, short to ground, or short to B+ in the rotation angle...

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 link assembly)
  2. Wire harness or connector
  3. Power steering earth wire
  4. Power steering ECU assembly

WIRING DIAGRAM

C104138E03

INSPECTION PROCEDURE


1. CHECK POWER STEERING EARTH WIRE (BETWEEN POWER STEERING LINK ASSEMBLY AND BODY GROUND)

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

    OK:
    The power steering earth wire is securely installed to the power steering link assembly and body ground.



 NG
REINSTALL POWER STEERING EARTH WIRE
OK


2. CHECK HARNESS AND CONNECTOR (BETWEEN ECU ASSEMBLY AND MOTOR ROTATION ANGLE SENSOR)

  1. C110603E03
    Disconnect the R21 connector from the power steering link assembly.

  1. Disconnect the P42 connector from the power steering ECU assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    R21-1 (RZSN) - P42-4 (RZSN)
    		 Always
    		 Below 1 Ω
    R21-2 (RZG) - P42-13 (RZG)
    		 Always
    		 Below 1 Ω
    R21-3 (RZV) - P42-2 (RZV)
    		 Always
    		 Below 1 Ω
    R21-4 (RZCS) - P42-3 (RZCS)
    		 Always
    		 Below 1 Ω
    R21-1 (RZSN) - Body ground
    		 Always
    		 10 kΩ or higher
    R21-2 (RZG) - Body ground
    		 Always
    		 10 kΩ or higher
    R21-3 (RZV) - Body ground
    		 Always
    		 10 kΩ or higher
    R21-4 (RZCS) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. C102954E03
    Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    R21-1 (RZSN) - R21-2 (RZG)
    		 Always
    		 50 to 140 Ω
    R21-3 (RZV) - R21-2 (RZG)
    		 Always
    		 50 to 140 Ω
    R21-4 (RZCS) - R21-2 (RZG)
    		 Always
    		 15 to 45 Ω

    NOTICE:
    If replacing the power steering link 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 LINK ASSEMBLY
OK


4. REPLACE POWER STEERING ECU ASSEMBLY

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


NEXT


5. INITIALIZE ROTATION ANGLE SENSOR VALUE 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).

  1. Is DTC C1528 output?

    OK:
    DTC is not output.

    NOTICE:
    If replacing the power steering link 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 LINK ASSEMBLY
OK

END


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