Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
This sounds like a ground issue that i have seen before. the pcm has an injector driver that has its own ground, i am going to send you the wiring diagrams for the pcm (the ones with the grounds in it), check the pcm grounds at their bolt points and i would definatly also check at the pcm as well.
3 and 4
have look here before you go any further
your laptop should be able to open them no problem, i donk think ive had any issues with them before.
if not, its good that you have prodemand..
just pull up the ecm wiring diagrams and locate the grounds and make sure they are good. this was the problem i had before. the pcm ones are located on the rear right of the engine, but the nice thing is grounds are easy to make new ones instead of chase them lol.
at the rear of the engine too, there should be a round harness connector too, make sure those pins are good there too.
let me know and good luck!
thanks for the detailed info.
I thought about that I forgot to ask if there was 12v at injectors too, but you have eliminated that.
Can you make sure that the throttle position sensor is not full 5 volts at this will shut down the injectors too.
Have a look at that and eliminate that.
I am at work. So I'm going to check a few things and get back to you when I get home.
still trying to figure this out. thanks for the patience
thanks for all of the info though, you have hit everything i would have so this is a tough one. im tryign a few things to see what i can come up with.
this waste spark system is wonkey on these,
the cam and crank go through the icm first (which is why you have spark), than the icm sends signal to pcm to the injector drivers.
did you try a new icm?
if not i probably would, if not...
the i think its wiring between the icm and the pcm, the signal is prbably there but weak to a possible chaffed wire.
so each wire will have to be continutiy checked from icm to pcm, i think this is where our problem is
I have included a link for you on a really good desccription and article on caddillacs wonderfull ,lol, system.
you did a key relearn procedure too?
im pretty sure you just leave the key on fir 20 mins, lol.
the theft can cut the injector drivers too, thats why its good to do a relearn.
if that doesnt work,
we will have to check every wire from icm to pcm
its nice to talk to another tech, and i enjoy some of these nightmares, hopefully i can help you find it because i can tell you know your stuff
that the first thing i looked for,
Almost every chart i looked at said replace the pcm , lol.
that article is a great article,
im like you, im a well known diagnostic tech, the worst part for me is who do i call when i need help lol.
ill keep this open and if anything comes to mind ill let you know too.
I remember something a long while back about wiring in the harness around the intake, do you think i can pull those cobwebbs out??? nope.
let me know what you find and good luck!