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1998 Chrysler Sebring Could I have shorted the PCM?


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sliprat
New User

Oct 5, 2013, 6:50 AM

Post #1 of 6 (1473 views)
1998 Chrysler Sebring Could I have shorted the PCM? Sign In

I bought a 'fixer upper' 1998 2.5 L Sebring Convertible. Originally it would start and run for a second then die. Finally gave up and brought it to the dealer. They had to replace the PCM, Key, and SKIM. Got it running, but told me my alternator was spiking a blowing the ASD fuse.

They cut the wires from the alternator so the fuse wouldn't blow and I drove it home as I already threw too much $ at the dealer.

The wiring harness to the alternator was spliced in several places and looked suspect, so rather than go right for the alternator, I ordered a new pigtail plug and replaced all of the wiring that was spliced together. Car ran fine and alternator light went out. Drove it around for about 10 minutes then it blew the ASD fuse again.

I drove the car up onto jack stands. Without thinking, I went to pull the pigtail out with a pair of plyers and I arched across the the positive input against the alternator. I know I should have unplugged the battery first, but like I said, I wasn't thinking. I immediately removed the negative terminal from the battery.

I proceeded to replace the alternator. The three things I unplugged in the process was the oil sending pump wiring, the air conditioning clutch wiring and the wires from the alternator.

I finished replacing the alternator and jump in to start the car and it will crank but won't fire up. I checked for spark and no spark.

Could the arch have fried my new PCM or am I chasing the wrong squirrel? How can I tell if the PCM is fried? Could it be something as simple as a ground wire somewhere that I forgot I disconnected? I'm stuck and can use some troubleshooting help at this point. Thanks!


Discretesignals
Ultimate Carjunky / Moderator
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Oct 5, 2013, 7:09 AM

Post #2 of 6 (1460 views)
Re: 1998 Chrysler Sebring Could I have shorted the PCM? Sign In

The ignition was turned off right when this happened?

The wire that grounded out on the alternator was the fat wire that comes from the battery?

Did you check the ASD fuse again. Maybe it blew when you turned the ignition on and your thinking it has something to do with the oopsy.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Oct 5, 2013, 7:11 AM)


sliprat
New User

Oct 5, 2013, 3:22 PM

Post #3 of 6 (1440 views)
Re: 1998 Chrysler Sebring Could I have shorted the PCM? Sign In

It was the large wire that grounded out against the metal part of the alternator. It only was for a fraction of a second, but I know that is all it takes.

I have checked the ASD fuse 20 times because it is behaving just like when that fuse would blow.


Discretesignals
Ultimate Carjunky / Moderator
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Oct 5, 2013, 3:28 PM

Post #4 of 6 (1436 views)
Re: 1998 Chrysler Sebring Could I have shorted the PCM? Sign In

If you have a 12 volt test light or digital volt meter, check for power at the ASD fuse with the ignition on.

The battery wire that goes to the alternator from the battery positive terminal has a fusible link in it. You could have blown the fusible link, but don't think it should cause loss of power to the fuse block.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


sliprat
New User

Oct 6, 2013, 3:01 PM

Post #5 of 6 (1420 views)
Re: 1998 Chrysler Sebring Could I have shorted the PCM? Sign In

The battery to the alternator wire shows 12v. So the fuse is fine.

I get 2v across the ASD with the ignition turned on and 3.3v when cranking.

I hear the gas pump each time the ignition gets turned to on.

Car cranks, but no start. Checked spark at plug wire - no spark.


Hammer Time
Ultimate Carjunky / Moderator
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Oct 6, 2013, 3:42 PM

Post #6 of 6 (1418 views)
Re: 1998 Chrysler Sebring Could I have shorted the PCM? Sign In


Quote
I get 2v across the ASD with the ignition turned on and 3.3v when cranking.


What does across the ASD mean?

DS asked you if you had power at the ASD




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