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 condition notification signal) from the power steering converter, 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 processes and outputs signals.

DTC No. Detection Condition Trouble Area
C1564 Power steering converter communication error
  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU

C1565 Power steering converter communication error
  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU

WIRING DIAGRAM

A01GXHLE01

INSPECTION PROCEDURE

PROCEDURE


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


    1. A01H1FME04

      Disconnect the A44 power steering ECU connector.

    2. Disconnect the n1 power steering converter connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A44-10 (ASST) - n1-7 (ASST) Always Below 1 Ω
      A44-7 (WDD1) - n1-1 (WDD1)
      A44-10 (ASST) or n1-7 (ASST) - Body ground Always 10 kΩ or higher
      A44-7 (WDD1) or n1-1 (WDD1) - Body ground

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


    1. A01H0FSE08

      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
    OK
  3. REPLACE POWER STEERING CONVERTER ASSEMBLY


    1. Replace the power steering converter Click here.


    NEXT
  4. CHECK DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

      Note

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


    B
    A