Diagnostic Item 15: Diagnose the lines between the joint connectors (CAN3 and CAN1): Function
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
The diagnostic result demonstrates that "diagnose the lines between the joint connectors (CAN3 and CAN1)" when the scan tool (M.U.T.-III) checks the periodically sent data from each ECU and cannot receive the engine control module (ECM) data.