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Chris M
Dodge Dakota
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4/06/2011
16:21:44
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 Subject: No Fire to Engine
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K guys, maybe u can help me. I have a 93 Dodge Dakota V6 3.9 MPI 2WD. The engine turns but does not fire. It has new Ignition Coil, plugs, wires, Distributor Cap, Rotor, and Pickup Sensor.
Pulled the Plug on the Ignition coil and getting no spark from it. Tested the Primary input voltage with a digital multimeter while cranking and it is .4V Getting 0 OHMS on the wires from the plug to the PCM so wires are good. Getting a connection on the ground wire on plug to frame ground, so ground is good.
Anyone has a Pinout Diagram of the PCM so i can test it?
Does anyone else have any ideas? Did I miss anything?
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Chris M
Dodge Dakota
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4/06/2011
16:40:10
|  RE: No Fire to Engine
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Oh and the Distributor is turning fine.
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daddio
Dodge Dakota
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4/06/2011
20:45:26
| RE: No Fire to Engine
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did you check for codes?
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Chris M
Dodge Dakota
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4/06/2011
23:42:09
| RE: No Fire to Engine
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I read somewhere how to do it, but i didnt get any flashes on the Check Engine Light.
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Bob Lincoln
Dodge Dakota
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4/07/2011
08:14:24
| RE: No Fire to Engine
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If you don't get any flashes, the ECM is not communicating (i.e., dead or no power to it). Try again:
http://www.allpar.com/fix/codes/index.htmlhttp://www.allpar.com/fix/codes/index.html
What made you change the coil originally?
BTW, a digital multimeter won't give you any accurate reading on the coil, as the coil switches faster than the meter can update. You need an oscilloscope for that.
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Chris M
Dodge Dakota
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4/07/2011
11:01:18
| RE: No Fire to Engine
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Ill check for the Codes again on lunch, update when i get em. I changed the coil at the recommendation of a friend that said since i wasnt getting a spark that was the most likely problem. and will an analog meter work better? I dont have an O-Scope
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Chris M
Dodge Dakota
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4/07/2011
11:39:49
| RE: No Fire to Engine
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mut have done it wrong, anyway, all i get is code 12
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daddio
Dodge Dakota
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4/07/2011
13:44:33
| RE: No Fire to Engine
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Code 12 is temporary loss of power to the PCM. I guess you disconnected the battery recently. If you did you cleared any codes if there were any to begin with. You say "pick up sensor". Is the the one in the distributor or the Crank Position Sensor behind the passenger side cylinder head? I was suspect the CPS or the ASD relay or the infamous #115 splice below the underhood fuesbox. I'd check the splice first. Peel back the tape and wire loom about 6 inches back from the fuesbox and look for a 3 wrie to 1 wire splice. I think they are red or red with a white stripe. Remake the slice preferably soldering it.
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Chris M
Dodge Dakota
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4/07/2011
14:06:54
| RE: No Fire to Engine
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the pickup sensor in the distributor under the rotor button. ya i had the battery out to recharge it as i ran it down working on the engine. ill check on the splice. is there a test for the CPS or the ASD relay?
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Chris M
Dodge Dakota
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4/07/2011
15:24:27
| RE: No Fire to Engine
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K the splice is good, still holding on strong, so thats out.
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daddio
Dodge Dakota
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4/07/2011
15:54:53
| RE: No Fire to Engine
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A Haynes or Chilton's repair manual show you how check those components. The splice wasn't corroded or anything?
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Chris M
Dodge Dakota
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4/07/2011
16:32:30
| RE: No Fire to Engine
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Didnt look corroded, but "just cuz" dont know what else to do, I cut out the splice, added a length of wire and a couple of wire nuts. still nothing. ive got a haynes manual but it doesnt say anything on how to check the CPS, or ASD, only shows replace.
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Chris M
Dodge Dakota
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4/07/2011
16:41:23
| RE: No Fire to Engine
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a little more info, dont know if it will help. it ran fine up till beginning of winter. after doing some hauling into the backyard, it was parked there over winter and wasnt started all winter. Tried it a few weeks ago to move it and it wouldnt fire, only crank. I originally thought maybe bad gas so i pumped out the gas and put in new gas and also replaced the fuel filter. i know the fuel pump was running cause i can hear it when i turn the key on. and i released the fuel pressure and cranked it, it had pressure again at the pressure release so its getting fuel pressure. But it was after that i discovered it had no spark from the Ignition coil and started this whole mess.
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daddio
Dodge Dakota
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4/07/2011
16:52:57
| RE: No Fire to Engine
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Try checking for codes again. You may want to check out the wiring to make sure some unfreindly critters didn't chew anything up.
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Bob Lincoln
Dodge Dakota
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4/08/2011
08:21:33
| RE: No Fire to Engine
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And there must be a code 55 after the code 12, right? If not, you didn't finish reading them, or something's wrong.
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Chris M
Dodge Dakota
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4/08/2011
09:20:12
| RE: No Fire to Engine
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Ya I got the 55 after the 12. Ive been looking over the wiring and cant see any areas that look like theyve been invaded by any rodents or anything. No evidence of chewed stuff, both in dash and under the hood at least. Im at a loss at this point. Ill be pulling the CPS and checking it today sometime, the ASD should be fine as the fuel pump is working. After that, Im stumped.
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daddio
Dodge Dakota
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4/08/2011
10:11:52
| RE: No Fire to Engine
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55 is end of codes. Could be the CPS but I'd try to find a way to test it. Try searching the web for a way to test it. You may get lucky. I think the CPS only cost about 30 bucks.
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Donald W Hurd
Dodge Dakota
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2/26/2017
16:06:47
| RE: No Fire to Engine
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I have no spark coming from coil I have tested fuel pressure. I
have replaced the crank sensor, cam sensor, coil, and computer and
still no spark. I have repair the wire connection under the relay box
and have power on all wires. I jumped the automatic shut down
relay and the pump relay and still no spark. Got any suggestion of
what is wrong.
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