Lexus IS250 · Service Manual STEERING

C1523

Diagnostic trouble codes

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

B124179E01

INSPECTION PROCEDURE


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

  1. C116653E02
    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)

  1. C116649E01
    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


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