Dtc U0104 Lost Communication With Driving Support Ecu

Power Source Network. Land Cruiser. Urj200, 202 Grj200 Vdj200
Networking. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PRECAUTION

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK FOR OPEN IN CAN BUS WIRE (DISTANCE CONTROL ECU ASSEMBLY CAN BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)

DTC U0104 Lost Communication with Driving Support ECU


DESCRIPTION


DTC Code
DTC Detection Condition
Trouble Area
U0104
There is no communication from the distance control ECU assembly.
  1. Power source circuit of distance control ECU assembly
  2. Distance control ECU assembly CAN branch wire or connector
  3. Distance control ECU assembly
  1. For vehicles with a dynamic radar cruise control system.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc U0104 Lost Communication With Driving Support Ecu


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
1.PRECAUTION
NOTICE:
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:
    For vehicles with an SRS system:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
    NOTICE:
    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 (DISTANCE CONTROL ECU ASSEMBLY CAN BRANCH WIRE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc U0104 Lost Communication With Driving Support Ecu

  1. Disconnect the E108 distance control ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E108-8 (CANH) - E108-9 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Distance Control ECU assembly)


NG
REPAIR OR REPLACE DISTANCE CONTROL ECU ASSEMBLY BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK


4.CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc U0104 Lost Communication With Driving Support Ecu

  1. Connect the cable to the negative (-) battery terminal.

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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E108-1 (B) - Body ground
    		Ignition switch ON
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E108-12 (GND) - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Rear view of wire harness connector
(to Distance Control ECU assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE DISTANCE CONTROL ECU ASSEMBLY (Click here)