INSPECTION PROCEDURE 4: TC-SST-ECU power supply circuit malfunction: Notes
WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Paddle Shift Switch System - Circuit Diagram
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 2: Power Supply System - Circuit Diagram
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
CAUTION:
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.