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BillH
Dodge Dakota
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8/11/2003
07:39:16
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 Subject: 94 3.9L Won't Start
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Message:
Help Please... 94 V6 3.9L MultiPort FI. Won't start. It cranks. I get voltage to the ASD and Fuel pump relays. No fuel pressure and the PCM activates the ASD circuit 1 second after I turn the key. I suspect the PCM is seeing a condition I can't and is activating the ASD circuit. Does anybody know what conditions will activate the ASD circuit? I am suspicious of the camshaft position sensor but don't know how to test it. Advice needed. Thanx
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whitedakota2
Dodge Dakota
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8/11/2003
12:05:46
|  RE: 94 3.9L Won't Start
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Bad fuel pump? Why no fuel pressure? The ASD circuit should come on when the key is on. It should be on for a few secounds then go off. During that time the fuel pump should run. Check your fuel pump.
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BillH
Dodge Dakota
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8/17/2003
11:31:40
|  RE: 94 3.9L Won't Start
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Thanx for the advice. I replaced the fuel pump 6 months ago with a used model and assumed that it was ok. I was wrong. I replace the pump with a new one and eveything is fine now. As a side note, in tracing the fuel pump circuit I found water had been getting into the large square connector on the firewall and I had a high-resistive short in the fuel pump circuit that was probably pulling the circuit voltage down. The DAK is back on da road again. Thanx.
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JKnPA
Dodge Dakota
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8/17/2003
14:49:34
| RE: 94 3.9L Won't Start
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Bill,
How difficult was it to replace the fuel pump.? Do you have a particular manual that shows the elec. connections for the fuel pump, or is it just a general manual like the Haynes manual 87-96. I'm looking for a manual just for my 96, that is why I'm asking.
Is this the same truck that Reesa is posting about?
JK
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BillH
Dodge Dakota
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8/18/2003
07:47:24
| RE: 94 3.9L Won't Start
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Changing out the fuel pump is not a "walk in the park." You must drop the fuel tank out to get to it. Once the tank is out however changeout is easy. I have a Mitchell 1994 domestic light truck & van service & repair manual that I got from a mechanic friend. It does show greater wiring detail than what I have in my Haynes manual. The Mitchell manual is about 3" thick and has tons of info for troubleshooting and error codes. My book is for 94 models only but If you can place your hands on a 96 version for your truck, I recommend it highly.
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JKnPA
Dodge Dakota
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8/18/2003
15:47:29
| RE: 94 3.9L Won't Start
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Thanks Bill.
I want to get a manual that is specific for my 96 Dakota. Those wiring diagrams (Haynes) are 'general', but I want the manual to be exact.
The gas tank/fuel filter looks like work.
J.K.
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BillH
Dodge Dakota
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8/18/2003
18:25:19
| RE: 94 3.9L Won't Start
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The bad thing about it is that you can't just replace the pump itself. You have to replace the entire fuel pump/regulator/fuel guage/filter unit at around $150. The parts aren't sold separately.
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JKnPA
Dodge Dakota
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8/18/2003
18:48:32
| RE: 94 3.9L Won't Start
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That figures..............
I posted about "rail caps" for my 96 Sport. I would like something like what Bushwacker sells, but I don't see any for my Dakota Sport.
Do yo know anywhere I can buy them.....see post from yesterday.
JK.
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Kingspawn
Dodge Dakota
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9/13/2003
03:04:57
|  RE: 94 3.9L Won't Start
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Hay guys, I’ve been reading your replies and learned a few things. I have a Chrysler manual and though it ant perfect the wire diagrams sure help. I have a 94 sitting in the driveway for three days now and had to put my 97 back on the road. Was gonna sell it for a harely. That’s like going to the movies with 7 dollars.... pop corn anyone? Anyhow this is how it should work. With key on you should have +12 volts all the time to the outer posts I believe of the Pump relay and the ASD. That looks to be supplied from pin #3 of PCM. Pin #9 feeds +12 to the one side of the both relays primary amongst other things. Always when key is on. When the distributor is turning (as in turning the key) (cranking) the Pcm will or should provide threw pin 51 -12 (ground) as long as the engine is turning and only for a short time when key is first turned on. In my case I only have +12 at the ASD relay outer terminals if I remember right but not at the pump relay. Both wires should be RD/WT in color and are spliced, splice {A14} right below and back where the ABS control should be, except I don’t have one. A temporary test in that case would be to jump thoughs two wires together before tearing up for the splice. Can't wait until tomorrow to check it out. Will let you know how it works out.
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Kingspawn
Dodge Dakota
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9/14/2003
00:00:09
|  RE: 94 3.9L Won't Start
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Ha guys,
I'm back. No the problem was not at the relay for me. Will be dropping tank tomorrow. Here's how to know if it's your fuel pump or at least at the fuel pump. Pull your fuel pump relay. Take a hot wire + and connect it to the terminal in closest to the engine. That will give you 12 volts almost straight to the pump through the DG/BK wire except for going threw black 16 wire harness on the fire wall at terminal 15. I did have corrosion on some of the terminals there. Cleaned them up and solved some other problems not my fuel pump problem. The quickest way to be sure to have 12 volts at the tank is to pull the wires out of plastic encasement by frame right under drivers door. And tap the DG/BK wire with a sure source of 12 + volts. If that does not run the pump there is only one other BK wire actually two that ground the pump. The wire diagram shows two black ground wires going from tank to a 6-wire split right behind the rear axel. One is for the pump and the other is fuel gauge. Well out of convenience they show it that way but really one goes to the 6 way split and the other goes back to the front. There is a grounding screw next to the windshield washing fluid container and is on top of paint witch depends on a corroded screw for ground. Back to the simplest way to eliminate guessing about voltage to the top of tank. If you open wire casing next to tank by the rear wheel going to tank and make sure both BK wires have a ground source and that the DG/BK wire has 12 + volts the pump has to run. Right! I have a test light with a pointed probe and I stick it into the wire and take my alligator jumper wires to supply the juice. Have fun. We should write to Chrysler a letter and tell them……. Tanks for nothing.
John
Kingspawn2King3@juno.com
new Kingspawn2King3@aol.com
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