Dtc U0114/38 Lost Communication With 4Wd Control 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 (4WD CONTROL ECU CAN BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BATTERY AND BODY GROUND)

DTC U0114/38 Lost Communication with 4WD Control ECU


DESCRIPTION


DTC Code
DTC Detection Condition
Trouble Area
U0114/38
There is no communication from the 4WD control ECU.
  1. Power source circuit of 4WD control ECU
  2. 4WD control ECU branch wire or connector
  3. 4WD control ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc U0114/38 Lost Communication With 4Wd Control 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 (4WD CONTROL ECU CAN BRANCH WIRE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc U0114/38 Lost Communication With 4Wd Control Ecu

  1. Disconnect the A27 4WD control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A27-19 (CAN+) - A27-20 (CAN-)
    		Ignition switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to 4WD Control ECU)


NG
REPAIR OR REPLACE 4WD CONTROL ECU BRANCH WIRE OR CONNECTOR (CAN+, CAN-)
OK


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


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc U0114/38 Lost Communication With 4Wd Control 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. Disconnect the A28 4WD control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A28-3 (IG) - 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
    A28-4 (GND) - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to 4WD Control ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE 4WD CONTROL ECU (Click here)