Visual Inspection

WARNING: This page is about a different car, the 2009 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Connector is disconnected or improperly connected
Connector pins are pulled out
Stretched an broken wires at terminal section
Low contact pressure between male and female terminals
Low connection pressure due to rusted terminals or foreign matter lodged in terminals

Fig 1: Identifying Harness Wire Breakage And Terminal Section
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.