DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [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 2*1 or sub bus 18*2.
When the network gateway ECU receives a response signal from the ECUs connected to sub bus 2*1 or sub bus 18*2, the network gateway ECU recognizes and memorizes that the ECU is connected to sub bus 2*1 or sub bus 18*2. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to sub bus 2*1 or sub bus 18*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*1 or sub bus 18*2, 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 21 or sub bus 182.	Open or short in sub bus 21 or sub bus 182 main line or connector Open or short in sub bus 21 or sub bus 182 branch line or connector Network gateway ECU Absorber control ECU3 4WD ECU assembly4 Clearance warning ECU assembly5 Driving support ECU assembly6 Seat belt control ECU7 Blind spot monitor sensor RH8 DCM (telematics transceiver)*9 Rear television camera assembly Open or short in No. 1 junction connector Open or short in No. 2 junction connector Open or short in No. 3 junction connector Open or short in No. 4 junction connector Open or short in No. 9 junction connector