DTC U1002: Lost Communication with Gateway Module (Power Management1) [02/2014 - 11/2016]: Description

The power management control 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 11.
When the power management control ECU receives a response signal from the ECUs connected to sub bus 11, the power management control ECU recognizes and memorizes that the ECU is connected to sub bus 11. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to sub bus 11 when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to sub bus 11, the power management control ECU determines that a malfunction exists.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
U1002	Lost Communication with Gateway Module (Power Management1)	The power management control ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 11.	Open or short in sub bus 11 main line or connector Open or short in sub bus 11 branch line or connector Power management control ECU Driving support ECU assembly (w/ Pre-collision system) Clearance warning ECU assembly (w/ Intuitive parking assist system) Lane departure warning camera (w/ Lane departure alert system) Television camera assembly (w/ Parking assist monitor system) Blind spot monitor sensor LH (w/ Blind spot monitor system) Open or short in No. 1 CAN junction connector Open or short in No. 2 CAN junction connector Open or short in No. 1 CAN junction terminal	HINT: The power management control ECU stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 11.

HINT:

This diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Techstream display: PM1 Gateway).