POWER STEERING SYSTEM (for 2GR-FXE), Diagnostic DTC:C1566/27

DTC Code DTC Name
C1566/27 Lost Communication with PSOK Signal of DC-DC Converter

DESCRIPTION

Base on the WDD signal (power steering converter condition notification signal) from the power steering converter assembly, the power steering ECU performs various processes. Based on the PSOK signal (EPS assist permission signal) from the power management control ECU, the power steering converter supplies a high voltage power supply to the power steering ECU.

DTC Code Detection Condition Trouble Area
C1566/27 PSOK signal communication malfunction

  • Hybrid control system

  • Harness or connector

  • Power steering converter assembly

  • Power steering ECU assembly

WIRING DIAGRAM

A01FTABE01

INSPECTION PROCEDURE

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the power steering converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work Click here.

    Tech Tips

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note


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

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  • If the power steering ECU assembly is replaced a new one, perform assist map writing, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

PROCEDURE


  1. CHECK DTC (HYBRID CONTROL SYSTEM)


    1. Check for DTCs in the hybrid control system Click here.

      Result
      Result Proceed to
      P3086-184 or P3087-183 is not output A
      P3086-184 or P3087-183 is output B

    B

    GO TO HYBRID CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - POWER STEERING CONVERTER)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect the N92 power management control ECU connector.

    3. Disconnect the X3 power steering converter connector.

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

      Standard Resistance
      Tester Connector Condition Specified Condition
      N92-19 (PSOK) - X3-6 (DDOK) Always Below 1 Ω
      N92-19 (PSOK) or X3-6 (DDOK) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE POWER STEERING CONVERTER ASSEMBLY


    1. Replace the power steering converter assembly Click here.


    NEXT

  4. CHECK DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1566/27 is not output A
      DTC C1566/27 is output B

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    A

    END