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1st Gen Durango 1998 - 2003 Durango's

bad computer??????

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Old 02-15-2010, 03:58 PM
dadodeez dadodeez is offline
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Default bad computer??????

The other day i tried to start up my truck but it wouldnt. I charged the battery and put it in and tried again. Got it to turn over but wouldnt start still. When i let off the key the lights and computer were clicking in unison. I couldnt hear the fuel pump so i changed that thinking that was the problem but its still doing the same thing. My voltage gauge and fuel gauge are all the way down to zero but i have power in the cab. I know the tank has gas in it from changing the pump. Im wondering what this could be. I want to get a new pcm and put it in but dont know if theres something else wrong that could short out the new one. Or if this is even the problem. My fuel pump wont start working unless i run a jumper from the battery post to the relay if that helps. I would appreciate any advice from anyone before i push the dam truck off a cliff. Thanks.
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Last edited by dadodeez; 02-15-2010 at 04:02 PM..
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Old 02-15-2010, 05:26 PM
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Any codes show up?
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Old 02-15-2010, 06:14 PM
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try changing the fuel pump relay in the pdc under the hood, sounds like you arent getting power to the fuel pump, and that is the most common culprit
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Old 02-15-2010, 09:52 PM
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Does your durango have a 4.7L motor. Have you ck the fuse's in the PDC? A blown fuse will give you the same problem.
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Last edited by master tech; 02-15-2010 at 09:54 PM.. Reason: adding to story
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Old 02-16-2010, 10:06 PM
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Exact same problem with mine. Let me know if you figure anything out and I'll do the same. I swapped relays around and had all the same symptoms so that doesn't seem to be the fix.
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Old 02-16-2010, 10:38 PM
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Check your battery connections for corrosion.
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Old 02-16-2010, 11:28 PM
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Check your battery connections for corrosion.
thats another place to check, but iv never heard of it throwing a no buss code
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Old 02-17-2010, 03:53 AM
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It's got to be something electrical. We tried shooting starter fluid into the carb (probably a bad a idea but oh well) and can't get it to fire. We're guessing it's a bad ground or a frayed wire somewhere. I cleaned the ground and pos terminals and installed a new battery but it's still faulting. Going to check continuity for the ground and see if there are any bad/frayed wires. Thanks for your help btw.
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Old 02-17-2010, 11:35 PM
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Do you have spark?
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Old 02-18-2010, 04:25 AM
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Nada spark or fuel. Tested fuel pressure with the key on and nothing. Also hooked up a diagnostic unit and couldn't get it to connect. Still have to check connections, ground etc. Next step will probably be a new PCM.

My mechanic thinks I reversed polarity while originally trying to jump the battery with a charger but I know that wasn't the case. I might be on the short bus now and then but that's something I've never done or could forget.
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Old 02-18-2010, 12:09 PM
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Check the main fuse on the PDC first (the first one like a 140 AMP or something).


If everything is good and you have power there then I'm thinking PCM as well. You can pick up Pre-Programed PCM's on ebay for like $200 shipped and ready for direct bolt in!!!!
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Old 03-04-2010, 06:20 PM
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Quote:
Originally Posted by hydrashocker View Post
Check the main fuse on the PDC first (the first one like a 140 AMP or something).


If everything is good and you have power there then I'm thinking PCM as well. You can pick up Pre-Programed PCM's on ebay for like $200 shipped and ready for direct bolt in!!!!
Not to Hijack this thread but.....a friend of mine is having the exact issues with hers. 98 5.2L If the main Comp fuse keeps blowing is it safe to assume that the ecu is bad, or would it be somewhere or something else??
Thanks for the input Hydra!!
PS your new truck looks pretty sweet, great find!
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Old 03-04-2010, 11:40 PM
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Blowing a fuse at the PDC sounds like a voltage issue. Have the alternator checked then check the grounds, then a possible PCM.


By the way<------A ECU is a Ford name and a PCM is a Dodge name for the same part (comuter).
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Old 03-05-2010, 11:23 AM
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Originally Posted by hydrashocker View Post
By the way<------A ECU is a Ford name and a PCM is a Dodge name for the same part (comuter).

BTW: comuter is actually spelled commuter, and is someone who travels to work/school/wherever else they need to everyday, a computer is what controls the engines on out trucks
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Old 03-05-2010, 12:08 PM
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Alright mr. (enter name of southern florida city here) Son,
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Old 03-05-2010, 02:09 PM
Jason Van Order Jason Van Order is offline
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I had the same problem with a '97 ram the battery went dead put in a new one and would start no fuel no spark put in a new pcm and been running like brand new ever since
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Old 03-05-2010, 02:15 PM
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BTW: comuter is actually spelled commuter, and is someone who travels to work/school/wherever else they need to everyday, a computer is what controls the engines on out trucks
Smart a$$......LOL


Actually it's miss spelled as "Computer" Dr. Sharps!......
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Old 03-06-2010, 08:51 AM
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Originally Posted by hydrashocker View Post
Blowing a fuse at the PDC sounds like a voltage issue. Have the alternator checked then check the grounds, then a possible PCM.


By the way<------A ECU is a Ford name and a PCM is a Dodge name for the same part (comuter).
A thousand pardons to the Mopar faithful!!!! I changed a speed density ford to mass air and it is stuck in my head, aven though I changed the PCM in my own Durango LOL I'll get it right eventually.

Okay so I told her to start at the alternator and then check all grounds first. Then she told me the whole story I hate that!! So apparently she is having the tranny replaced as the og went out. In the meanwhile, it has been intemitently(spellcheck Dr. Sharps) has not been starting guages dead, no fuel pump, no codes, but she has not seen "NO BUSS" yet and mileage in odometer has not blinked with KOEO like mine did. Fuel pump replaced twice and relay replaced no help. 3 140 amp fuse blew one after another when installed. Hope this helps the diagnosis. Should the start still be at the alternator then grounds then possible PCM replacement or could there have been issues caused by the tranny swap??
Thanks again all wise ones!! Your help is always greatly appreciated
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Old 03-06-2010, 01:54 PM
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A thousand pardons to the Mopar faithful!!!! I changed a speed density ford to mass air and it is stuck in my head, aven though I changed the PCM in my own Durango LOL I'll get it right eventually.

Okay so I told her to start at the alternator and then check all grounds first. Then she told me the whole story I hate that!! So apparently she is having the tranny replaced as the og went out. In the meanwhile, it has been intemitently(spellcheck Dr. Sharps) has not been starting guages dead, no fuel pump, no codes, but she has not seen "NO BUSS" yet and mileage in odometer has not blinked with KOEO like mine did. Fuel pump replaced twice and relay replaced no help. 3 140 amp fuse blew one after another when installed. Hope this helps the diagnosis. Should the start still be at the alternator then grounds then possible PCM replacement or could there have been issues caused by the tranny swap??
Thanks again all wise ones!! Your help is always greatly appreciated
LMAO @ Dr. Sharps.......

Ok, there is a serious short. You are going to have to find out what is causing the fuse to blow first. You might have to pull everything out (take picture first) then slowly replace to narrow down the area of draw or do a continuity to ground to possibly find it.

A wiring loom may have been pinched during install of the transmission.
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Old 03-07-2010, 09:31 AM
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Originally Posted by hydrashocker View Post
LMAO @ Dr. Sharps.......

Ok, there is a serious short. You are going to have to find out what is causing the fuse to blow first. You might have to pull everything out (take picture first) then slowly replace to narrow down the area of draw or do a continuity to ground to possibly find it.

A wiring loom may have been pinched during install of the transmission.
Thanks Hydra, I will report back as soon as I know with any updates
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Old 03-07-2010, 09:31 AM
 
 
 
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