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CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U0230

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DTC Code DTC Name
U0230 Lost Communication with Rear Gate Module
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DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0230 There is no communication from the power back door unit assembly (power back door ECU).

  • Power source circuit of power back door (power back door ECU)

  • Power back door unit (power back door ECU) CAN branch wire or connector

  • Power back door unit (power back door ECU)

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

Operating the ignition switch, any other switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

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PROCEDURE


  1. Click here

    PRECAUTION

    Note:

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).


  2. Click here

    DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      For vehicles with an SRS system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).


  3. Click here

    CHECK FOR OPEN IN CAN BUS WIRE (POWER BACK DOOR ECU CAN BRANCH WIRE)


    1. A0156AUE06

      Disconnect the L52 power back door unit assembly (power back door ECU) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L52-6 (MPX1) - L52-5 (MPX2) Ignition switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Back Door Unit Assembly [Power Back Door ECU])

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    CHECK HARNESS AND CONNECTOR (POWER BACK DOOR ECU - BATTERY AND BODY GROUND)


    1. A0156AUE07

      Connect the cable to the negative (-) battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L52-11 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L52-10 (ECUB) - Body ground Always 11 to 14 V
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Back Door Unit Assembly [Power Back Door ECU])

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    REPLACE POWER BACK DOOR UNIT ASSEMBLY (POWER BACK DOOR ECU)Click here

  6. Click here

    REPAIR OR REPLACE POWER BACK DOOR ECU CAN BRANCH WIRE OR CONNECTOR (MPX1, MPX2)

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR