DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [06/2015 - 11/2018]: 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 sub bus 2.
When the network gateway ECU receives a response signal from the ECUs connected to sub bus 2, the network gateway ECU recognizes and memorizes that the ECU is connected to sub bus 2. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to sub bus 2 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 sub bus 2, the network gateway ECU determines that a malfunction exists.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
U1002	Lost Communication with Gateway Module (Network Gateway ECU)	The network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 2.	Open or short in sub bus 2 main lines or connector Short in sub bus 2 branch lines or connector Network gateway ECU Driving support ECU assembly Clearance warning ECU assembly Transmission control ECU assembly Skid control ECU (Brake booster with master cylinder assembly) EV control ECU Blind spot monitor sensor RH Lane departure warning camera DCM (Telematics transceiver) No. 2 CAN junction terminal Open or short in No. 3 CAN junction connector Open or short in No. 7 CAN junction connector	HINT: The network gateway ECU stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 2.

HINT:

This diagnosis procedure is for when DTC U1002 is output by the network gateway ECU (Techstream display: Gateway).