03 dakota 5.9l no coil control

On a 03 dodge dakota 5.9l, dose anyone have a cam crank correlation waveform. I looked at one that had everything and the kitchen sink thrown at. It had new distributor, coil and crank sensor that was not put on it yet. I got a good Ac sine wave on the cam sensor but falling in voltage on the crank, I put the crank sensor last since it also had a odd coil voltage. The coil had a 12v feed bleed down to ground and I had it exchanged under warranty, now it has a steady ground with no control. With the coil unplugged there is a control signal and coil control on the scanner does the same thing. not sure that I stand on it being a pcm or bad correlation being the issue. I messed up saving the waveforms and would have to go back to capture it.

how did you get a good sine wave on the cam sensor?? on the wiring diagram it looks like a hall effect sensor 3 wire sensor. are you saying that you don't have coil control plugged in but you do have it unplugged?

Hey sir! I'm also somewhat unclear about the your coil control. You have control during a bidirectional command, but not during cranking?

Like Cheryl said, I'm surprised to hear that you got an AC sine wave out of the CMP. I borrowed this cam crank from iATN:

bidirectional I get the same as cranking, signal unplugged and full ground plugged in. I dont know what made me look for ac on the cam but did find a even high low sign signal, thanks for the waveform

1mouse3 wrote: bidirectional I get the same as cranking, signal unplugged and full ground plugged in. I dont know what made me look for ac on the cam but did find a even high low sign signal, thanks for the waveform

No worries! SUPER glad you got a good signal out of the CMP sensor, 'cause I didn't have any answers if you were still getting a sine wave :lol:

For my info, how exactly are you checking for signal at the coil? Scope, test light? Coil disconnected, a test light connected to B+ pulses on the control wire during cranking, but stays lit solid when the coil is plugged in? The only way I could explain that is a short to ground on the coil power feed. Needless to say, this would also result in no power to the coil, and a blown fuse.

both with a scope and a test light, test light is constant lit on the new coil but not the old one with to B+. it does not light with both the coil and pcm disconnected . The power feed had not had fuses blowing

so your hooked up to battery positive coil unplugged checking for a pulsed ground with a test light and your not getting control? if im understanding right next thing id do is check it at the pcm connector to eliminate a broken wire.

Whats up Eddie :evil: LOL, J/K!
Looks like on this Dakota, the ignition coil power is supplied through the ASD relay. This can really throw a wrench into the works because you will only get power for like 2 seconds during the initial key on fuel pump prime, and then no power until you crank the engine.

The coil had a 12v feed bleed down to ground and I had it exchanged under warranty, now it has a steady ground with no control

I wonder if that's what you observed here.
When the PCM sees an RPM signal, it will power up the ASD relay again. This in turn powers things like the injectors and the ignition coil and fuel pump relay.
Can you check for power on the coil power feed during cranking? If there's no power during cranking, I would go ahead and check an injector for power while cranking and if still nothing, start troubleshooting the ASD circuit.
If you do have power while cranking, well then I guess we're gonna have to come up with another plan.

Having a hard time finding an ASD video! Are you a premium member?

These will help you troubleshoot the cam and crank sensors, still looking for and ASD related video.

it had a working fuel pump and had battery voltage to the coil positive, that made me think its not the asd. I think I was looking at this wrongly since I was more distracted with only getting millivolt readings on my meter and thinking I had a ground issues to my meter. It downed on me that I might have forgot to check ground on the cam crank, it did have 5v reference. it did throw a coil code till replace then a crank code till replaced, not sure if I was following the wrong path there. I need to trust my meter more than I am and get to know it better. I finally got back ahold of the owner and she sent it to a shop to get checked out, so dont know where this will go from here.