Truck won't start because their is no spark to coil?

Check fuses Locate and check or replace ASD relay Check if have power to coil when key on and engine cranking If so check and suspect coil. Here is a guide to help check the ASD and the location of the relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what happens.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

If your 1992 Dodge Dakota is not getting any spark to the coil or the crank angle sensor, there are several potential causes for this issue. Here are some steps you can take to diagnose and possibly resolve the problem:

Check the Ignition Fuse and Relays: Locate the ignition fuse and relays in the fuse box and check if any of them are blown or faulty. Replace any damaged fuses or relays.

Inspect the Wiring: Inspect the wiring going to the ignition coil, crank angle sensor, and other related components for any damage, fraying, or loose connections. Corroded or damaged wires can disrupt the electrical signal and prevent spark generation.

Test the Ignition Coil: Use a multimeter to test the ignition coil's primary and secondary circuits for continuity. A faulty ignition coil may not be able to generate spark.

Check the Crank Angle Sensor: Verify that the new crank angle sensor is compatible with your Dakota and installed correctly. Sometimes, aftermarket sensors may not function correctly or need specific adjustments.

Test the Crank Angle Sensor Signal: Use a multimeter or an oscilloscope to test the crank angle sensor's output signal while cranking the engine. It should produce a fluctuating voltage signal.

Inspect the Distributor Cap and Rotor: If your Dakota has a distributor-based ignition system, check the distributor cap and rotor for cracks, carbon tracks, or excessive wear. Replace them if necessary.

Verify the Engine Grounds: Ensure that all engine grounds are clean and secure. Poor grounding can cause electrical issues, including no spark.

Check for a Faulty ECM/PCM: The Engine Control Module (ECM) or Powertrain Control Module (PCM) could be faulty, preventing spark delivery. This would require diagnostic testing with specialized equipment.

Security System Malfunction: If your Dakota has a factory-installed security system, it may be inhibiting spark delivery. Check if the security light is on or if there are any security-related fault codes.

You know, I read this post today at 8:30 AM. It has been on my mind all day. Something just popped into my mind about the problem, now that it is 11:00PM. On the passanger side inner fender is a huge wiring harness to the PCM. If I remember correctly, there is a wiring splice about 1 to 2 feet into the harness. (It has been a while so bear with me). If I remember, the wire is either white with a red tracer or red with a white tracer and where the splice is located, the solder and joint corroded causing a bad connection and the loss of spark.

Check into that. It has been about 10 years since I delt with the last one, so check all splices in that area or a corrosion issue.

Let me know what you find. Also, the wire colors I listed (I think) are correct. Again, check all splices. I know it wasn't more than 2 feet into the harness, so you will need to cut the friction tape to access it.

Joe

I wish I could remember. Like I said, it has been awhile. It drove me crazy yesterday thinking about it because I remembered dealing with similar problems in the past. The wire had delt directly with the ignition system receiving power, but the exact thing, I can't remember.

Please let me know what you find. This is driving me nuts too. I wish I was there to dig into it.

They don't use an adhesive. The wires must be partially melted together. As far as the green residue you mentioned, that is the corrosion that I mentioned. It sounds like you have a nightmare on your hands. The ground issue could be one of the wires that are partially melted together.

Take your time and try to repair what was incorrectly done. I believe you found where the problem is located, now which wire is the problem is the next thing.

Let me know what you find.
Joe

Welcome to the forum, are there any codes? The asd relay supplies primary voltage to the coil-- injectors-- 02 heater circuits. It's best to check with engine cranking. The asd relay and fuel pump relay share the same ground circuit, so, no ground, neither relay will work. I'd have to check voltage and ground circuits at relays. If the computer isn't grounding those relays, I'd have to check the wiring circuits for the cam and crank sensors. Those are usually, ref voltage-- ground and signal.

Ran a wire from the positve cable to the coil and it started, but removed wire and it died.

The ASD relay powers the coil swap/replace it and see what happens

Check for power at the ASD relay socket red wire -you should have it, if not test the white fusible link

Could be the PCM not grounding the ASD relay to transfer power to the coil/fuel pump