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1998 Dodge Ram 1500 4x4 died now won't start

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  #1  
Old 01-28-2006, 07:05 AM
bh767bh bh767bh is offline
 
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Default 1998 Dodge Ram 1500 4x4 died now won't start

I have a 1998 Dodge Ram 1500 4x4, 5.2. One day I stopped and put gas in it, got back in and it fired up then died and would not start.[] Poured a little gas in the throttle body and it would run then die. Switched the fuel relay with one of the other relays in the box but still nothing from the fuel pump (checked to see if there was pressure at the tap on the fuel rail, there was none) so I assumed it was a fuel pump. After replacing the fuel pump it still does the same thing, there doesn't seem to be any power making it back to the fuel pump. Is there anything else that could be causing this besides a relay, does the pcm have anything to do with controlling the fuel pump?[:-]
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  #2  
Old 01-28-2006, 07:21 AM
Chump Chump is offline
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

I would think you have a bad Camshaft Position Sensor or a bad Crankshaft Position Sensor. You have checked all your fuses? If the PCM does not see certain signals from engine sensors it will shut down the ASD realy and you will loose power to the ignition and fuel system. Can you hear the pump run for about 2-3 seconds when you turn the key to "on". Can you have someone pull the error codes off the computer? you might want to get yourself a subscription for your truck at www.alldatadiy.com to get all the diagnostics and wiring diagrams. Real good info for $25
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Old 01-28-2006, 08:13 AM
bh767bh bh767bh is offline
 
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

All of the fuses seem to be Ok, if you pour some gas in the TB it will run. You can't hear the pump run at all. I pulled the plug off the pump and hooked a volt meter to it but it doesn't show any voltage.
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Old 01-28-2006, 08:13 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start


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ORIGINAL: bh767bh

All of the fuses seem to be Ok, if you pour some gas in the TB it will run. You can't hear the pump run at all. I pulled the plug off the pump and hooked a volt meter to it but it doesn't show any voltage.

Well, that's some good news in a way. This means the Crank and Cam sensors are ok. Try to start it then shut the key off, then see if you can feel the fuel pump relay click when the key is turned back on, you'll need an assistant.

[IMG]local://upfiles/21718/E8B393587C0543E7BFFCD7BEF97C28F0.jpg[/IMG]
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Old 01-28-2006, 08:19 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Next wiring diagram.

[IMG]local://upfiles/21718/B7D42B158F5D4E8F95556C451035626D.jpg[/IMG]
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Old 01-28-2006, 08:27 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Double check 2 fuses. Fuse #3 in the PDC under the hood and Fuse #9 in the fuse block under the dash.
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Old 01-28-2006, 08:48 PM
bh767bh bh767bh is offline
 
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Rechecked the fuses, they are Ok. Pulled the plastic cover off the relay, when you turn the key on, it closes contacts then releases, then after you try starting it it closes and releases shortly after cranking.
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Old 01-28-2006, 08:56 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start


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Rechecked the fuses, they are Ok. Pulled the plastic cover off the relay, when you turn the key on, it closes contacts then releases, then after you try starting it it closes and releases shortly after cranking.
Ok, then I guess the next thing to check is whether the relay is actually supplying voltage through the contacts. Have you had any other strange electrical problems with the truck recently?
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Old 01-28-2006, 08:58 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

No, it was running perfect, that's why I'm so puzzled by this.
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Old 01-28-2006, 09:06 PM
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No, it was running perfect, that's why I'm so puzzled by this.
Still sounds like a bad sensor, but what has me puzzled is that you cannot hear the pump run for 2 to 3 seconds when the key is turned on. Let's see if we can supply voltage directly to the pump and see if it runs. I'll have to work up a diagram
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Old 01-28-2006, 09:13 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

OK. What sensor would kill the power to the fuel pump, or would the pcm control the power?
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Old 01-28-2006, 09:19 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start


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OK. What sensor would kill the power to the fuel pump, or would the pcm control the power?
The Ecm sounds like it's doing what it is supposed at the moment and thats the relay clicking on and off for 2-3 seconds. Let's rule that out for now. Can you go to the truck and pull the fuel pump relay and look at the bottom of it and the top of the PDC where it mounts and see if there are any numbers stamped there...they would be like 85.86,87 and 30.
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Old 01-28-2006, 09:37 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

I found the diagram I was looking for. this should be a pic of your power distribution center under the hood. If not, tell me so.
With the key on check for voltage at slot #30(green) in the PDC with relay removed.

To send voltage back to the fuel pump you can place a wire in the terminal #87(yellow) and momentarialy touch the other end of the wire to a 12 volt source.

[IMG]local://upfiles/21718/A94F7C49413E42D4A96C72868F930447.jpg[/IMG]
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Old 01-28-2006, 09:56 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

I'll give it a try and let you know what happens.
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Old 01-28-2006, 09:57 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

10-4...I'm gonna sign off for a bit.
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Old 01-28-2006, 10:09 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Thanks, I have to get ready for work anyway. I did try jumping across the the terminals in the pdc, but no juice getting back to the pump.

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Old 01-30-2006, 04:55 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Do you hear the pump running? Based on it running perfect before putting the gas in, you may have contaminated fuel. Just my .02 cents
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Old 01-31-2006, 01:30 AM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Checked the connector at the bottom of the fender and found the power was making it that far but wasn't getting to the pump. Spliced a new wire into the hareness from that point back to the pump and so far it's working.[sm=yeahsmile.gif]
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Old 01-31-2006, 06:18 AM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start


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ORIGINAL: bh767bh

Checked the connector at the bottom of the fender and found the power was making it that far but wasn't getting to the pump. Spliced a new wire into the hareness from that point back to the pump and so far it's working.[sm=yeahsmile.gif]

Good work!!

[sm=happybounce.gif]
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Old 01-31-2006, 04:35 PM
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Default RE: 1998 Dodge Ram 1500 4x4 died now won't start

Thanks for all the help! Wonder if anyone else has had wiring problems like that.
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Old 01-31-2006, 04:35 PM
 
 
 
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