DTC U1002 (CAN No. 2 BUS), U0114: Lost Communication with Gateway Module (Network Gateway ECU); Lost Communication with 4WD Control ECU: Description

The network gateway ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the CAN No. 2 bus.
When the network gateway ECU receives a response signal from the ECUs connected to the CAN No. 2 bus, the network gateway ECU recognizes and memorizes that the ECU is connected to the CAN No. 2 bus. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to the CAN No. 2 bus when communicating with those ECUs. If the network gateway ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN No. 2 bus, the network gateway ECU determines that a malfunction exists.

DTC No.	DTC Detection Condition	Trouble Area
U0114	No communication from 4WD control ECU continues	Power source circuit of 4WD control ECU 4WD control ECU branch wire and connector 4WD control ECU
U1002	Network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to the CAN No. 2 bus.	Open or short in CAN No. 2 bus main wire or connector Open or short in CAN No. 2 bus branch wire or connector 4WD control ECU Network gateway ECU CAN No. 3 junction connector