DTC U1002: Lost Communication with Gateway Module [09/2014 - 11/2017]: 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 No.	Detection Item	DTC Detection Condition	Trouble Area	Note
U1002	Lost Communication with Gateway Module	The 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 lines or connector Short in sub bus 19 branch lines or connector Network gateway ECU Skid Control ECU (Brake Actuator Assembly) Absorber Control ECU Power Steering ECU Assembly Rear Steering Control ECU Front Steering Control ECU Open or short in No. 5 CAN junction connector Open or short in No. 8 CAN junction connector Open or short in No. 3 CAN junction terminal	HINT: The network gateway ECU stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 19.

HINT:

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