CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0230

DTC Code DTC Name
U0230 Lost Communication with Rear Gate Module

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0230

No communication from power back door ECU continues.*1

No communication from back door closer ECU continues.*2

  • Power source circuit of the power back door ECU*1

  • Power back door ECU branch wire or connector*1

  • Back door motor unit (Power back door ECU)*1

  • Power source circuit of the back door closer ECU*2

  • Back door closer ECU branch wire or connector*2

  • Multiplex network door (Back door closer ECU)*2

*1: w/ Power back door system

*2: w/o Power back door system

WIRING DIAGRAM

A01CARSE07
A01CARSE08
A01CBTNE02
A01CBTNE03

INSPECTION PROCEDURE

Note


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

  • After the engine 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 engine switch, any other switches or doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.

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 will help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Check for DTCs Click here.

      Tech Tips

      If the CAN MS bus communication DTC U1002 (Lost Communication with Gateway Module (Main body ECU)) is output, perform 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

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK VEHICLE TYPE


    1. Check for vehicle type.

      Result
      Result Proceed to
      w/ Power back door system A
      w/o Power back door system B

    B

    CHECK CAN BUS WIRE FOR DISCONNECTION (BACK DOOR CLOSER ECU BRANCH WIRE) Click here

    A

  3. CHECK CAN BUS WIRE FOR DISCONNECTION (POWER BACK DOOR ECU BRANCH WIRE)


    1. A01CG9AE01

      Turn the engine switch off.

    2. Disconnect the connector of the power back door ECU.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      N18-6 (MPX1) - N18-5 (MPX2) Engine switch off 54 to 69 Ω

    NG

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

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01CG9AE02

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N18-10 (ECUB) - Body ground Always 11 to 14 V
      N18-12 (B) - Body ground Always 11 to 14 V
      N18-8 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01CG9AE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N18-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

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

  6. CHECK CAN BUS WIRE FOR DISCONNECTION (BACK DOOR CLOSER ECU BRANCH WIRE)


    1. A01CDCSE05

      Turn the engine switch off.

    2. Disconnect the connector of the back door closer ECU.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      N33-11 (MPX1) - N33-12 (MPX2) Engine 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. A01CDCSE06

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N33-16 (ECUB) - Body ground Always 11 to 14 V
      N33-4 (B) - Body ground Always 11 to 14 V
      N33-15 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  8. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01CDCSE07

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N33-3 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU) Click here