(Mitsubishi Lancer) Faulty Fan Control Module

2003 Mitsubishi Lancer ES 2.0L
In this diagnosis, i am troubleshooting a vehicle that has cooling fans that keep running with KOEO or KOER. I emphasize some testing methods that will help determine the culprit problem between the fan control module or ECM unit. This cooling fan operation is a module to module communication. For more information about module to module communication and pull down circuit design, check out "scannerdanner" TH-cam channel.