DTC U1002: Lost Communication with Gateway Module [09/2014 - 10/2015]: 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 19.
When the network gateway ECU receives a response signal from the ECUs connected to sub bus 19, the network gateway ECU recognizes and memorizes that the ECU is connected to sub bus 19. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to sub bus 19 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 19, the network gateway ECU determines that a malfunction exists.

DTC Code	DTC Detection Condition	Trouble Area
U1002	Network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 19.	Open or short in sub bus 19 main line or connector Open or short in sub bus 19 branch line or connector ECM Front steering control ECU Network gateway ECU Absorber control ECU1 Power steering ECU assembly Driving support ECU assembly2 Brake actuator assembly (skid control ECU) Rear steering control ECU Open or short in No. 2 junction connector Open or short in No. 3 junction connector Open or short in No. 5 junction connector Open or short in No. 10 junction connector