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

DTC Code DTC Name
U0230 Lost Communication with Rear Gate Module

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0230 Lost Communication with Rear Gate Module There is no communication from the multiplex network door ECU.
  • Power source or inside multiplex network door ECU

  • Multiplex network door ECU CAN branch wire or connector

  • Multiplex network door ECU

Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A01KC2CE04

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • 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.

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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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Tech Tips


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

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Main Body > Trouble Codes

      Tech Tips

      If DTC U1002 is output from gateway of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

      Result
      Result Proceed to
      DTC U1002 is not output from main body ECU (multiplex network body ECU) A
      DTC U1002 is output from main body ECU (multiplex network body ECU) B

    B
    A
  2. CHECK FOR OPEN IN CAN BUS WIRE (MULTIPLEX NETWORK DOOR ECU CAN BRANCH WIRE)


    1. A01KCPSC05
      *a

      Rear view of wire harness connector

      (to Multiplex Network Door ECU)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the multiplex network door ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U18-13 (CANP) - U18-14 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND)


    1. A01KDHIC01
      *a

      Rear view of wire harness connector

      (to Multiplex Network Door ECU)

      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. Disconnect the multiplex network door ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U18-1 (ECUB) - Body ground Always 11 to 14 V
      U19-8 (B) - Body ground Always 11 to 14 V
      U18-7 (IG) - Body ground Ignition switch ON 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      U19-7 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG