CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U1119

DTC Code DTC Name
U1119 Lost Communication with Object Recognition ECU (CAN)

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1119 There is no communication from the object recognition ECU.
  • Power source or inside of object recognition ECU

  • Object recognition ECU CAN branch wire or connector

  • Object recognition ECU


WIRING DIAGRAM

A001CPYE08
*a No. 14 Junction Connector
*b from RR-IG1 Relay
*c Object Recognition ECU

CAUTION / NOTICE / HINT

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. PRECAUTION

    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.


    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 SRS 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 (OBJECT RECOGNITION ECU CAN BRANCH WIRE)


    1. A001B23E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Object Recognition ECU)

      Disconnect the object recognition ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      g1-16 (CANH) - g1-5 (CANL) Engine switch off 54 to 69 Ω

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (OBJECT RECOGNITION ECU - BATTERY AND BODY GROUND)


    1. A001BI0E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Object Recognition 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 Switch Condition Specified Condition
      g1-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      g1-10 (GND) - Body ground Always Below 1 Ω

    OK
    NG