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CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U0141

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

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

  • Power source circuit of No. 2 main body ECU

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

  • No. 2 main body ECU

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

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PROCEDURE


  1. Click here

    PRECAUTION

    Note:

    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).


  2. Click here

    DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).


  3. Click here

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


    1. A0156AUE08

      Disconnect the L50 No. 2 main body ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L50-11 (MPX+) - L50-12 (MPX-) Ignition switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Main Body ECU)

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


    1. A0156AUE09

      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
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Main Body ECU)

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    REPLACE NO. 2 MAIN BODY ECUClick here

  6. Click here

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

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    REPAIR OR REPLACE HARNESS OR CONNECTOR