DTC U1002: Lost Communication with Gateway Module (Power Management2): 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 power management bus.
When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management control ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management 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 power management 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 power management bus.	Open or short in power management bus main line or connector Open or short in power management bus branch line or connector Power management control ECU ECM Air conditioning amplifier assembly Skid control ECU (Brake booster with master cylinder assembly) CAN No. 1 junction connector CAN No. 5 junction connector

HINT:

This diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Techstream display: PM2 Gateway).