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
--
later,
dave AKA vwdoc1

"Artur Jorge Duque" <ajduque@oitunix.oit.umass.edu> wrote in message
news:Pine.GSO.4.55.0507151327370.3681@shell2.oit.u mass.edu...
> Hi all,
> I've got a pretty much stock 95YJ with around 140,000 miles on it. The
> other day, as I was driving, the Jeep turned itself off. It didn't stall
> out, just shut down. The battery had juice and I had a half tank of gas.
> I tried to re-start but all it would do is crank over and over - nothing
> ever caught.
>
> I took it to a repairman and I was told the computer is dead. I'm
> presented with the option to have the computer sent out for rebuilding
> (its estimated at about $700).
>
> Can the computer be rebuilt? Does this sound legit? I've got to give the
> dude an answer soon as to what to do, and would like to hear from more
> knowledgable people.
>
> Thanks
>
> -Art

 

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
--
later,
dave AKA vwdoc1

"Artur Jorge Duque" <ajduque@oitunix.oit.umass.edu> wrote in message
news:Pine.GSO.4.55.0507151327370.3681@shell2.oit.u mass.edu...
> Hi all,
> I've got a pretty much stock 95YJ with around 140,000 miles on it. The
> other day, as I was driving, the Jeep turned itself off. It didn't stall
> out, just shut down. The battery had juice and I had a half tank of gas.
> I tried to re-start but all it would do is crank over and over - nothing
> ever caught.
>
> I took it to a repairman and I was told the computer is dead. I'm
> presented with the option to have the computer sent out for rebuilding
> (its estimated at about $700).
>
> Can the computer be rebuilt? Does this sound legit? I've got to give the
> dude an answer soon as to what to do, and would like to hear from more
> knowledgable people.
>
> Thanks
>
> -Art

 

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
--
later,
dave AKA vwdoc1

"Artur Jorge Duque" <ajduque@oitunix.oit.umass.edu> wrote in message
news:Pine.GSO.4.55.0507151327370.3681@shell2.oit.u mass.edu...
> Hi all,
> I've got a pretty much stock 95YJ with around 140,000 miles on it. The
> other day, as I was driving, the Jeep turned itself off. It didn't stall
> out, just shut down. The battery had juice and I had a half tank of gas.
> I tried to re-start but all it would do is crank over and over - nothing
> ever caught.
>
> I took it to a repairman and I was told the computer is dead. I'm
> presented with the option to have the computer sent out for rebuilding
> (its estimated at about $700).
>
> Can the computer be rebuilt? Does this sound legit? I've got to give the
> dude an answer soon as to what to do, and would like to hear from more
> knowledgable people.
>
> Thanks
>
> -Art

 

make sure the white wire witha yellow tracer has ing. battery voltage. if
there is none the vehicle will never start

jeff wrote:

> Mike Romain wrote:
> > 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.
>
> To add to what Mike said, a re manufactured ECU is a lot cheaper than
> $700. A quick check of http://www.ecudirect.com 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.
>
> --
> jeff

 

make sure the white wire witha yellow tracer has ing. battery voltage. if
there is none the vehicle will never start

jeff wrote:

> Mike Romain wrote:
> > 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.
>
> To add to what Mike said, a re manufactured ECU is a lot cheaper than
> $700. A quick check of http://www.ecudirect.com 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.
>
> --
> jeff

 

make sure the white wire witha yellow tracer has ing. battery voltage. if
there is none the vehicle will never start

jeff wrote:

> Mike Romain wrote:
> > 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.
>
> To add to what Mike said, a re manufactured ECU is a lot cheaper than
> $700. A quick check of http://www.ecudirect.com 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.
>
> --
> jeff

 

make sure the white wire witha yellow tracer has ing. battery voltage. if
there is none the vehicle will never start

jeff wrote:

> Mike Romain wrote:
> > 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.
>
> To add to what Mike said, a re manufactured ECU is a lot cheaper than
> $700. A quick check of http://www.ecudirect.com 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.
>
> --
> jeff