CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0139

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

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U0139

Lost Communication with Suspension Control Module B

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

Power management control ECU

WIRING DIAGRAM

C217350E46

INSPECTION PROCEDURE

Note:

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

Tip:

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 the 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

      Result

      Result

      NEXT
    NEXT

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

    1. C214372C01

      *a

      Rear view of wire harness connector

      (to Stabilizer Control ECU)

      Disconnect the G57 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

      G57-29 (CANH) - G57-28 (CANL)

      Engine switch off

      54 to 69 Ω

      Resul

      Result

      OK

      NG
    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. C214372C02

      *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

      G57-22 (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

      G57-24 (IG) - Body ground

      Engine switch on (IG)

      11 to 14 V

      Resul

      Result

      OK

      NG
    OK

    REPLACE STABILIZER CONTROL ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR