Lexus IS250 · Service Manual STEERING

C1552

Diagnostic trouble codes

DESCRIPTION

This circuit supplies power to drive the power steering motor.
DTC No.
 DTC Detection Condition
 Trouble Area
C1552
 This DTC is detected when power source voltage drops or remains high.
  1. EPS fuse
  2. Wire harness
  3. Power steering ECU assembly

WIRING DIAGRAM

B124192E01

INSPECTION PROCEDURE


1. INSPECT FUSE (EPS FUSE)

  1. Remove the EPS fuse from the engine room relay block.

  1. Check for continuity of the EPS fuses.

    OK:
    Continuity



 NG
REPLACE FUSE
OK


2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY)

  1. C110951E16
    Disconnect the A31 connector from the power steering ECU assembly.

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

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    A31-4 (PIG) - Body ground
    		 Always
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)

  1. C110951E18
    Measure the resistance according value(s) in the table below.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    A31-5 (PGND) - Body ground
    		 Always
    		 Blow 1 Ω

    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU ASSEMBLY


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