CAN COMMUNICATION SYSTEM (for LHD with Entry and Start System), Diagnostic DTC:U0139

DTC Code DTC Name
U0139 Lost Communication with Suspension Control Module B

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0139 There is no communication from the stabilizer control ECU.

  • Power source or inside stabilizer control ECU

  • Stabilizer control ECU branch wire or connector

  • Stabilizer control ECU

WIRING DIAGRAM

A00JYSXE18

INSPECTION PROCEDURE

Note

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

Tech Tips

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

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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

      CAUTION:

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

      Note


      • After turning the engine 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.

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


    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (STABILIZER CONTROL ECU BRANCH WIRE)


    1. A00K0RTE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Stabilizer Control ECU)

      Disconnect the G123 stabilizer control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G123-29 (CANH) - G123-28 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE STABILIZER CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - BATTERY AND GROUND)


    1. A00K0RTE05
      Text in Illustration
      *a

      Rear view of wire harness connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G123-22 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G123-24 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STABILIZER CONTROL ECU Click here