I am willing to try this on one of my vehicles out of curiosity, but I was a Chrysler mechanic for ten years, and never heard of this procedure. This sounds like a variation of relearning GM's anti-theft system. Disconnecting the battery cable will erase diagnostic fault codes and fuel trim numbers, but those codes will self-erase after fifty engine starts if the problems are gone. Fuel trim numbers are constantly updating on their own without us ever noticing, so there is no reason to want to erase those.
The only thing you need to do for Chryslers after the battery was disconnected or run dead is drive the car. Specifically, idle speed will be too low until "minimum throttle" is relearned. Until that is relearned, you will not get the nice idle flare-up to 1,500 rpm at start-up, the engine may not start unless the accelerator pedal is held down 1/4", and it will tend to stall at stop signs.
To meet the conditions to initiate minimum throttle relearn is to drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. Time and high intake manifold vacuum are the things the engine computer watches to know when it must be in control of idle speed.
Thursday, June 7th, 2018 AT 1:19 PM
