CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1123

DTC Code DTC Name
U1123 Lost Communication with Variable Nozzle Type Turbo Charger Module

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1123 There is no communication from the turbocharger sub-assembly.

  • Power source or inside of turbocharger sub-assembly

  • Turbocharger sub-assembly CAN branch wire or connector

  • Turbocharger sub-assembly

WIRING DIAGRAM

A01CJ1SE04

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.

PROCEDURE


  1. 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.


    NEXT

  2. 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 airbag system.

      Note

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


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (TURBOCHARGER SUB-ASSEMBLY CAN BRANCH WIRE)


    1. A01CHT1E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Turbocharger Sub-assembly)

      Disconnect the turbocharger sub-assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      T13-4 (CANH) - T13-3 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE TURBOCHARGER SUB-ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (TURBOCHARGER SUB-ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01CHT1E05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Turbocharger Sub-assembly)

      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
      T13-2 (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
      T13-1 (+B) - Body ground Ignition switch ON 20 to 28 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here