1997 Dakota 3.9 5 speed No spark or fuel pump power

I am not a whiz with electricl either, & my FSM is for '03, and it looks as if the fuel pump circuitry has changed a couple of times from '97 to (at least as early as) '03. I am looking at a schematic in a Dakota Haynes '97 through '99 & they are showing one schematic for the fuel pump circuit that is '97 only. ('98 & '99 are different, I am not sure about '00, & then in '01 it changed again.)

You said you had verified good fuses (did you do that with an ohm meter?) so I take it that fuse 1 in the PDC is good, and fuse 10 also in the PDC are good?

As far as getting power through fuse 9, if I am understanding what I am looking at, when the key is turned to 'RUN' is when you should be getting power there, and the thing is, if you were not, you shouldn't even be able to crank your engine as power through the starter relay (to the starter) goes through fuse 9 as well as power to energize the fuel pump relay through the fuel pump control section of the PCM.

So are you able to crank the engine without putting a jumper to fuse9?
And are you also saying that without putting a jumper to fuse 9 you are not getting any action on your gauges?

No gauges/no fuel pump/no spark seems rather complex and over my head. I am kind of just looking at the fuel pump for now (which is undoubtely the wrong way to go about it) and from your PCM to your fuel pump relay (this would be fuel pump relay control) is a light blue/orange wire (#18) and from your FP relay a light green/black wire (#20)connects to a "joint connector #1" in your PDC and from that the light green/black wire (#20) connects to fuse #9. Maybe take an ohm meter and verify continuity from relay to PCM & relay to fuse #9?

Power actually goes through your FP relay to the FP itself from fuse #1. Dark green/black (#16) from FP to FP relay with a connector in between, red/white (#16) from FP relay to fuse #1 in the PDC with " joint connector #2" in between. maybe check for continuity between all those points as well?

Lastly, do you think it is possible that you got a bad PCM or that it was not programmed correctly for your Dakota?

In a separate post from this, I am going to scan the schematics that I am looking at & attempt to attch them so that we are looking at the same thing. I'll do it separate from this because I often screw things like that up on the computer & I don't want to lose what I've typed so far.
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. . . I am just curious of a couple of things. Here are a couple of checks you could do first that would be easier than those continuity checks that I first suggested.

If you take your volt meter & backprobe the dark green/orange wire at your coil, you should read battery voltage when the key is turned to 'on'. You've only got about 2 seconds to read this voltage as the PCM should de-energise the ASD relay if it (the PCM) doesn't get a valid signal from the crank & cam position sensors, therefore you need to set your vm up where you can see it when you turn the key, or have an assistant help you.

If you are not getting voltsage for the first two seconds, that would suggest the ASD relay was the open in that part of your circuit.

If you are getting voltage, back probe the coil driver terminal (black/gray wire) with a test light & the test light should flash during cranking which would verify that it was getting a trigger signal from the PCM. If no trigger signal, that would point to the crank &/or cam position sensors (which I realize you've alrady replaced) & if those were good, it would then point to your PCM as the reason you were getting no output from your coil.

(When you said "no spark", I take it you checked from the coil, or did you only check at the plugs?)

knisleyharlan08 said:

I got the pcm from flashmasters

Click to expand...

Well, I am not saying that the flashmasters did a bad job or that the PCM is your problem, but if you are looking for a common denominatier, that's the only one I am seeing in the schematics that I was looking at that I posted for you.

A couple of things to note on that:

Maybe there is something my untrained eye is missing.
And maybe the issues are unrelated.

Those schematics came from Haynes, not from MOPAR, & Haynes is not always completely reliable (but Haynes is all I have for '97).

In my handwritten notes (for my '03 which has a different circuit for the FP) I wrote that "if the PCM senses no signal from either the crank or cam pos sensor it will deenergize both the ASD AND fuel pump relays." But I am not sure where I got that from and I don't know for sure that this is accurate and I believe that I did mean it to apply to an '03. However, if it is true for a '97, that would be another pointer towards either your PCM, CMP, or CKP (or the CKP or CMP circuits) as common threads between signal to & output from coil, AND the fuel pump relay energizing.

And lastly, back to your reman PCM, back in '18 my Dak shot craps & I troubleshot it to the PCM. Before making a move I did some research on which way to go, & in the course of that, I watched a s-load of youtubes, & one youtube guy said he could throw remans further then he trusted them. He theorized that a lot of reman places just pulled them from bone yards & did some rudimentary checks & if they passed sold them as being remanufaured. I am not saying that I know that this is true or that this is what flashmasters did or that the PCM is even your problem (but I wouldn't rule it out). Anyhow, for that reason, I sent mine to a facility that did bench check & repair.

If it was me, right now, in your position, the next thing I would do (if I didn't want to farm it out to a shop) would be to check for v & trigger signal at the coil as described a couple of posts ago.

Good luck.