Does the fried "little black box" perhaps have a part number on it ?

 

If you pulled ecu from a donor car and didn't get it recode to the vin of your car, then the gauge cluster and fob and ignition ring etc. Do not match and car will not run.

 

Ok here's the deal I got a computer and security box from one car in junk yard but no key.... The car does same thing as befire.... Everything works but no start... It's like you don't have clutch pushed in.. the fuel pump comes on and everything. I put old computer back in and sane thing so I looped the clutch interference switch wire. I found a car here in Dallas that has key and computer... Should I buy this or just have my car reprogram?

 

Key, ignition ring, skreem, gauge cluster and dash, all coded together, if one doesn't work, it will tell the computer not to start the car.
Hopefully someone can chime in and would know a general price range.
But sounds like there is another problem besides the original ecu.
You say no start, you mean cranking and not starting or not cranking?
if it is cranking but not starting, has it ever shown sign it wanted to start?

 

The TCU is coded with the VIN number and this cars TCU was under water. I am not sure that the ECU is coded.

 

Three components must have the same shared security code:
1) The chip in the key
2) The SKREEM behind the dash
3) The ECM (PCM)

Keys/chips cannot be reprogrammed to different cars. The keys are only available through Chrysler dealers, or someone that works with dealers. Needswings.com can provide both keys and SKREEMS programmed with the specific security code for specific car VIN. If the ECM/PCM was water damaged replacing the SKREEM and Key alone will not get you going.

I don't recall reading about anyone that has done this but if you replace the Key, SKREEM, and ECM(PCM) all together from another car they would all have the same security code in them, so that could be the ticket. Of course you would not be able to get a replacement factory key unless you proved registration/ownership of the car the parts came from.


BTW, this site is your best source to solve this problem. Most Chrysler dealers no longer have experienced/trained techs for these cars, and Mercedes dealers will not touch them.