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 Note
U0230 Lost Communication with Rear Gate Module

    w/ Power Back Door System

  • No communication from the back door motor unit continues.


    w/ Back Door Closer System without Power Back Door System

  • No communication from the multiplex network door ECU continues.

    w/ Power Back Door System

  • Back door motor unit branch line or connector

  • Power source circuit of back door motor unit

  • Back door motor unit ground circuit

  • Back door motor unit


    w/ Back Door Closer System without Power Back Door System

  • Multiplex network door ECU branch line or connector

  • Power source circuit of multiplex network door ECU

  • Multiplex network door ECU ground circuit

  • Multiplex network door ECU

Tech Tips

The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

Tech Tips

This diagnostic procedure is for when DTC U0230 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

WIRING DIAGRAM

B006L3IE63
B006L3IE64

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any 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 engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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

    DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

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

    Click here

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

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.


      Body Electrical > Main Body > Trouble Codes

      Tech Tips

      If DTC U1002 is output from Main Body 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 the main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from the main body ECU (multiplex network body ECU) (GTS display: Main Body) B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/ Power Back Door System A
      w/ Back Door Closer System without Power Back Door System B

    B

    CHECK FOR OPEN IN SUB BUS 1 LINES (MULTIPLEX NETWORK DOOR ECU UNIT BRANCH LINE) Click here

    A

  3. CHECK FOR OPEN IN SUB BUS 1 LINES (BACK DOOR MOTOR UNIT BRANCH LINE)


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

    2. Disconnect the K22 back door motor unit connector.

    3. B006OAPC05
      *a

      Front view of wire harness connector

      (to Back Door Motor Unit)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K22-6 (MPX1) - K22-5 (MPX2) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BACK DOOR MOTOR UNIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B006OAPC07
      *a

      Front view of wire harness connector

      (to Back Door Motor Unit)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K22-11 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

    2. Reconnect the cable to the negative (-) battery terminal.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K22-8 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      K22-10 (ECUB) - Body ground Always 11 to 14 V
      K22-12 (B) - Body ground Always 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE BACK DOOR MOTOR UNIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

  5. CHECK FOR OPEN IN SUB BUS 1 LINES (MULTIPLEX NETWORK DOOR ECU UNIT BRANCH LINE)


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

    2. Disconnect the K21 multiplex network door ECU connector.

    3. B006NKJC10
      *a

      Front view of wire harness connector

      (to Multiplex Network Door ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-10 (CANP) - K21-11 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MULTIPLEX NETWORK DOOR ECU)

    OK

  6. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B006NKJC11
      *a

      Front view of wire harness connector

      (to Multiplex Network Door ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-1 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

    2. Reconnect the cable to the negative (-) battery terminal.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K21-16 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      K21-18 (ECUB) - Body ground Always 11 to 14 V
      K21-19 (B) - Body ground Always 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)