POWER STEERING SYSTEM, Diagnostic DTC:C1564, C1565

DTC Code DTC Name
C1564 Lost Communication with WDD Signal of DC / DC Converter
C1565 Lost Communication with LDD/ASST Signal of DC / DC Converter

DESCRIPTION

Based on the WDD signal (power steering converter assembly condition notification signal) from the power steering converter assembly, the power steering ECU processes and outputs signals. Based on the ASST signal (EPS demand signal) from the power steering ECU, the power steering converter assembly processes and outputs signals. As a fail-safe function, when the system is malfunctioning, power assistance is limited.

DTC No. DTC Detection Condition Trouble Area
C1564 WDD signal communication error

  • ECU-IG1 No. 1 fuse

  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU
C1565 ASST signal communication error

  • ECU-IG1 No. 1 fuse

  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU

WIRING DIAGRAM

A01NGDGE01

INSPECTION PROCEDURE

Note


  • If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


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


    1. A01NF3RE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)
      *2

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

      Disconnect the F9 power steering ECU connector.

    2. Disconnect the F101 power steering converter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F9-3 (ASST) - F101-7 (ASST) Always Below 1 Ω
      F9-9 (WDD1) - F101-1 (WDD1)
      F9-3 (ASST) or F101-7 (ASST) - Body ground Always 10 kΩ or higher
      F9-9 (WDD1) or F101-1 (WDD1) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER POWER SUPPLY)


    1. A01NHFSE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering Converter Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F101-5 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE POWER STEERING CONVERTER ASSEMBLY


    1. Replace the power steering converter assembly with a new or known good one Click here.


    NEXT

  4. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1564 and C1565 are not output. A
      DTC C1564 or C1565 is output. B

    B

    REPLACE POWER STEERING ECU Click here

    A

    END