Theory Of Operation
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The PCM Monitors The Internal Microprocessor Functionality And Will Set This Fault If Errors Are Found. The PCM Will Flash The Etc Lamp Immediately After The Diagnostic Runs And Fails, And Will Illuminate The Mil Lamp After The Diagnostic Runs And Fails In Two Consecutive Drive Cycles.