CAN COMMUNICATION SYSTEM(for RHD without Central Gateway ECU), Diagnostic DTC:U0141

DTC Code DTC Name
U0141 Lost Communication with Body Control Module "A"

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0141 There is no communication from the No. 2 main body ECU.

  • No. 2 main body ECU CAN branch wire or connector

  • Power source or inside of No. 2 main body ECU

  • No. 2 main body ECU ground circuit

  • No. 2 main body ECU

WIRING DIAGRAM

B001X1GE01

CAUTION / NOTICE / HINT

Note


  • 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 Click here.

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

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. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      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

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 MAIN BODY ECU CAN BRANCH WIRE)


    1. B001W1QE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Main Body ECU)

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

    2. Disconnect the No. 2 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L50-11 (MPX+) - L50-12 (MPX-) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NO. 2 MAIN BODY ECU (MPX+, MPX-)

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 2 MAIN BODY ECU - BATTERY AND BODY GROUND)


    1. B001YC9E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Main Body 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. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      L50-14 (BECU) - Body ground Always 11 to 14 V
      L50-13 (SIG) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L50-7 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE NO. 2 MAIN BODY ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR