CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0230

DTC Code DTC Name
U0230 Lost Communication with Rear Gate Module

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
U0230 No communication from the power back door ECU (back door motor unit) or back door closer ECU continues.

  • Power back door ECU (back door motor unit) or back door closer ECU branch wire or connector

  • Power source circuit of power back door ECU (back door motor unit) or back door closer ECU

  • Power back door ECU (back door motor unit) or back door closer ECU

WIRING DIAGRAM

A01EKOYE03
A01EKOYE05

INSPECTION PROCEDURE

Note


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

  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.

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

  • 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 connectors, open the doors and leave them open.

Tech Tips


  • 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 may help determine the cause of the malfunction.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If CAN MS bus DTC U1002 is output from the main body ECU (driver side junction block assembly) (GTS display: Main Body), troubleshoot for U1002 and check for malfunctions in the CAN MS bus circuit.

      Result
      Result Proceed to
      U1002 is not output from main body ECU (driver side junction block assembly) (GTS display: Main Body) A
      U1002 is output from main body ECU (driver side junction block assembly) (GTS display: Main Body) B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      w/ Power back door system A
      w/ Back door closer system B

    B

    CHECK FOR OPEN IN CAN BUS WIRES (BACK DOOR CLOSER ECU BRANCH WIRE) Click here

    A

  3. CHECK FOR OPEN IN CAN BUS WIRES (POWER BACK DOOR ECU (BACK DOOR MOTOR UNIT) BRANCH WIRE)


    1. Turn the ignition switch off.

    2. A01EJDWE37
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Back Door ECU (Back Door Motor Unit))

      Disconnect the power back door ECU (back door motor unit) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L20-6 (MPX1) - L20-5 (MPX2) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POWER BACK DOOR ECU (BACK DOOR MOTOR UNIT) BRANCH WIRE)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01EJDWE34
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Back Door ECU (Back Door Motor Unit))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L20-10 (ECUB) - Body ground Always 11 to 14 V
      L20-8 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01EJDWE35
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Back Door ECU (Back Door Motor Unit))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L20-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

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

  6. CHECK FOR OPEN IN CAN BUS WIRES (BACK DOOR CLOSER ECU BRANCH WIRE)


    1. Turn the ignition switch off.

    2. A01EJLUE14
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Back Door Closer ECU)

      Disconnect the back door closer ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L21-12 (MPX2) - L21-11 (MPX1) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (BACK DOOR CLOSER ECU BRANCH WIRE)

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01EJLUE15
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Back Door Closer ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L21-16 (ECUB) - Body ground Always 11 to 14 V
      L21-15 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  8. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01EJLUE16
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Back Door Closer ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L21-3 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPLACE BACK DOOR CLOSER ECU