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CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0230

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

DTC No. Symptom Trouble Area
U0230 No communication from back door ECU continues

  • Power source circuit of back door ECU

  • Back door ECU branch wire and connector

  • Back door ECU
Tip:

For vehicles with power back door system only.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.

Tip:

  • Operating the ignition 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 will help determine the cause of the malfunction.

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PROCEDURE


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    CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Check for DTC.

      Tip:

      If the CAN MS bus communication error DTC U1002 is output, troubleshooting for U1002 and check for malfunctions in the CAN MS bus.

      Result
      Result Proceed to
      DTC U1002 is not output A
      DTC U1002 is output B

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    CHECK CAN BUS LINE FOR DISCONNECTION (BACK DOOR ECU BRANCH WIRE)


    1. Disconnect the back door ECU connector.

    2. A017FDDE05

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

      Standard resistance
      Tester Connection Condition Specified Condition
      O14-6 (MPX1) - O14-5 (MPX2) Ignition switch off 54 to 69 Ω

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    CHECK WIRE HARNESS


    1. A017FDDE06

      Disconnect the back door ECU connector.

    2. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      O14-11 (GND) - Body ground Always Below 1 Ω

    3. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      O14-12 (B) - Body ground Always 10 to 14 V
      O14-8 (IG) - Body ground Ignition switch on (IG) 10 to 14 V

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    GO TO DTC CHART (U1002)Click here

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    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER SLIDE DOOR ECU RH (MPX1, MPX2)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE BACK DOOR MOTOR UNIT (BACK DOOR ECU)Click here