Roadknee

I have a 1993 Grand, base model, 4.0L, auto trans. I recently washed the engine bay at the car wash and blew the 20A pcm fuse. Installed another fuse and heard a "pop" from pcm followed by electrical smoke. Trailered home and installed a new Standard Motor Products pcm (p/n 56027762). Motor starts and dies. I determined the injectors stop firing after the key is released. Ordered another ecm from a rebuilder that programs to the actual vin#. It does the same thing.

From all my research, it appears the pcm is in security mode. Problem is, my Jeep does not have security. I understand that a pcm from a vehicle with security can not be installed in one without. However, I'd like to think the remanufactured pcm memory has been "cleared".

I'm at a loss. I don't think of any other component that would disable the injectors when key is released. It's also not real likely I've received two defective pcm's.

Any ideas?

Thanks

freegdr

Possible ignition switch ?

Roadknee

I called tech support where I received the second pcm. They immediately admitted their mistake and overnighted me another pcm. Installed it and fired up on the first crank.

So if you need to install a new pcm in your Jeep w/o security, make sure you talk to the supplier and they understand that you need one without security. If you buy one from a parts house, it's a roll of the dice.