DTC U1002: Lost Communication with Gateway Module (Power Management1): 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 the CAN No. 2 bus.
When the power management control ECU receives a response signal from the ECUs connected to the CAN No. 2 bus, the power management control ECU recognizes and memorizes that the ECU is connected to the CAN No. 2 bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the CAN No. 2 bus 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 the CAN No. 2 bus, the power management control ECU determines that a malfunction exists.

DTC No.	DTC Detection Condition	Trouble Area
U1002	Power management control ECU cannot receive signals from all ECUs that have been memorized as those connected to the CAN No. 2 bus.	Open or short in CAN No. 2 bus main wire or connector Open or short in CAN No. 2 bus branch wire or connector Power management control ECU Driving support ECU Seat belt control ECU CAN No. 3 junction connector

HINT:

The diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Techstream display: Power Management1).