POWER STEERING SYSTEM, Diagnostic DTC:C1552

DTC Code DTC Name
C1552 PIG Power Supply Voltage Malfunction

DESCRIPTION

The power steering converter assembly steps down the HV battery voltage to approximately 46 V. This voltage is then supplied to the power steering ECU to operate the motors. As a fail-safe function, when the PIG power supply and power steering converter assembly are malfunctioning, power assistance is stopped.

DTC Code Detection Condition Trouble Area
C1552 PIG power supply voltage malfunction

  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU

WIRING DIAGRAM

A01GX2OE01

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, initialize the rotation angle sensor value and calibrate the torque sensor zero point Click here.


    B

    CONNECT CONNECTORS CORRECTLY

    C

    REPLACE POWER STEERING ECU Click here

    A

  2. CHECK POWER STEERING ECU (PIG TERMINAL)


    1. A01H0VRE01

      Disconnect the A44 ECU connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A44-4 (PIG) - Body ground Power switch ON (READY) 30 to 48 V

      Note

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


    NG

    CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY) Click here

    OK

    REPLACE POWER STEERING ECU Click here

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


    1. A01GWUTE08

      Disconnect the n2 power steering converter connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      n2-1 (PIG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01GZ7FE03

      Disconnect the A44 power steering ECU connector.

    2. Disconnect the n3 power steering converter connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A44-4 (PIG) - n3-1 (VOT1) Always Below 1 Ω
      A44-5 (PGND) - Body ground
      A44-4 (PIG) or n3-1 (VOT1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY)


    1. A01H0FSE07

      Disconnect the n1 power steering converter connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      n1-5 (IG) - Body ground Power switch ON (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING CONVERTER ASSEMBLY Click here