Good morning everyone!
My name is ferdinand and i have got a car repair garage in the south of Portugal,
I have a client that owns a Voyager 3.3 from 2001, it started to cut out while driving and failing to start, it would eventualy start after leaving it for an hour... Ive gone online looking for some answers and apparently im not the only one with this issue.. after checking everything stated on the internet and having an electronic specialist on it, we have got to the point where the BCM was getting quite hot and for that reason we have decided to change it... after that ive driven it and it cut out on me, i jumped out of the car and checked if i got spark on the plugs and didnt have any spark at all... but wat i noticed after it eventualy started again that the side were the ECU and relay box are, that it was almost boiling hot, even on the outside of the wing panel, after it cut out again on me i cooled down the ecu with some cold spray and yippi yey, it started! my question is, do you guys ever encountered this abnormal situation? cheers!

 

I am out of my league here but maybe voltage regulator or alternator putting out too much juice?

 

yeah u are out of your league the PCM is the voltage regulator not external and if it was putting to much juice out all it would do is make the battery light come on and get the battery hot.

 

It is a very strange situation indeed, but i refuse to give up on it as i am quite proud, the imobilizer as been checked and confirmed it is operating properly, but could it be that the ECU is getting hot on its own? The relay box has been checked and its not shorting..mive decided to wrap the ecu on its own in a special termal foil like they do with racing and confirm if the heat is sorced in the ecu or if its something external to it, but there is nothing there besides the relay box and battery, and the outer wingpanel is getting to about 50+ degrees centrigade... Very strange, i think ive met my nemesys!

 

ahh on most of my cars the voltage regulator is a separate component or built into the alternator. worth a mention just in case. the only time you have heat is too much power since that is what makes heat. so "something" is either not regulating properly or something is shorting.

since it runs I think we can guess not shorting. it seems to be a thermal shutdown. either the system is killing to preserve itself or the system is dying when a component malfunctions under the heat load.

Since I lack the means to diagnose integrated circuitry my second diagnostic tactic after confirming input voltage spec would be to hit the PNP and replace the unit and "see what happens"

 

what are the codes in the PCM?