Does anyone know how to overide the ecm on a 93 deville. I have a chiltons and it says go into diag and select pcm overide but im not coming across that (PS103). I am trying to perform the Idle learn procedure. Also While im in that ps103 Im supposed to be able to select pdo1. Anyone know how to navigate the system?:bigroll:

I think...

(1) press "warmer" and "off" and hold,
(2) the car starts showing codes, let it go thru,
(3) when "PCM?" is shown, press "increase" to get in "PCM DATA?",
(4) then pressing "decrease" cycles menu, I think you need to press "decrease" 3 times to get in "PCM OVERRIDE?",
(5) then press "increase" to get in the override mode.

It is just off my head... I may be wrong.

Thanks, Ill give it a shot