HYBRID CONTROL SYSTEM, Diagnostic DTC:P3087-183

DTC Code DTC Name
P3087-183 Open Circuit in DC / DC Converter EMPS

DESCRIPTION

The hybrid vehicle control ECU requests the power steering converter to operate or stop according to the usage state of the HV battery.

DTC No. INF Code DTC Detection Condition Trouble Area
P3087 183 Open or short to GND in the power steering converter permission signal line (PSOK)

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Power steering converter

WIRING DIAGRAM

A000U2ME04
*1 DDOK
*2 PSOK
*3 Power Steering Converter
*4 Hybrid Vehicle Control ECU

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with 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 disconnecting 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.

Tech Tips

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

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. Check the connections of the hybrid vehicle control ECU connectors.

      OK
      The connectors are connected securely and there are no contact problems.

    NG

    CONNECT SECURELY

    OK

  2. CHECK CONNECTOR CONNECTION CONDITION (POWER STEERING CONVERTER CONNECTOR)


    1. A000VV4

      Check the connection of the low voltage connector of the power steering converter.

      OK
      The connector is connected securely and there are no contact problems.

    NG

    CONNECT SECURELY

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - HYBRID VEHICLE CONTROL ECU)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Turn the power switch off.

    2. Remove the service plug grip Click here.

    3. Disconnect low voltage connector S75 from the power steering converter.

      Tech Tips

      For the removal and installation procedures related to the low voltage connector of the power steering converter, Click here.

    4. A000TA0E02
      *1 Power Steering Converter
      *2 DDOK

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      n1-6 (DDOK) - Body ground Power switch off 370 to 430 kΩ

    OK

    REPLACE POWER STEERING CONVERTER Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - HYBRID VEHICLE CONTROL ECU)


    1. Disconnect connector A77 from the hybrid vehicle control ECU.

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

      A000W0DE01
      *1 Rear view of wire harness connector: (to Hybrid Vehicle Control ECU)
      *2 Power Steering Converter
      *3 21 (PSOK)
      *4 DDOK
      Standard resistance (Check for open)
      Tester Connection Switch Condition Specified Condition
      A77-21 (PSOK) - n1-6 (DDOK) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      A77-21 (PSOK) or n1-6 (DDOK) - Body ground and other terminals Power switch off 10 kΩ or higher

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR