POWER STEERING SYSTEM, Diagnostic DTC:C1552, C1554

DTC Code DTC Name
C1552 PIG Power Supply Voltage Malfunction
C1554 Power Supply Relay Failure

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.

  • EPS fuse

  • Wire harness or connector

  • Power steering ECU assembly
C1554 Power source relay malfunction is detected.

WIRING DIAGRAM

A015ZSNE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTORS


    1. Check the connection of the power steering ECU connector.

    2. Visually inspect the terminals of the power steering ECU connector.

      Result
      Result Proceed to
      Normal A
      Connectors not properly connected B
      Power steering ECU connector terminals abnormal C

      Note

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


    B

    CONNECT CONNECTORS CORRECTLY

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    A

  2. INSPECT FUSE (EPS FUSE)


    1. Remove the EPS fuse from the engine room No. 1 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      EPS fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

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


    1. A0163IPE37

      Disconnect the A31 connector from the power steering ECU assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A31-4 (PIG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0163IPE38

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-5 (PGND) - Body ground Always Below 1 Ω

      Note

      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 Click here