Dead computer - can it be rebuilt? - need advice

The most common, and it's 'really' common cause for that is just a dirty connection on the CPS on the bell housing. The plug and socket sit right on top of the exhaust manifold and corrode easy. A good spray with an electronic contact cleaner fixes them.

Another very common one that causes the same symptoms is a dead body ground strap. It goes from the rear of the head to the firewall and when they quit, it just shuts down the computer.

The last one is a bolt above the dipstick with some small black wires on it. This is the computer sensor ground tag.

The main computers almost never fail. It happens for sure, just not often.

Even just unplugging the CPS and plugging it back in will usually get a start. If you do this and it fires up, you have found the trouble.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Artur Jorge Duque wrote:

To add to what Mike said, a re manufactured ECU is a lot cheaper than $700. A quick check of

shows a price of $250, and since they rarely fail I would imagine one could be had from a junk yard for much less. They are simple to replace but connectors and fuses should be checked first.

Did the tech check for correct power going to the ECM. I have seen a large fuse, possibly on a Grand Cherokee, cause a non-start issue. The fuse was located in the engine compartment on the right side.

Also can you blink DTC codes with your Jeep? Or even plug into it with a scanner?

How did the tech determine the ECM was bad?

Buy a good used one for checking purposes.

just some thoughts