Crank no start issue
Crank no start issue
ground pin of coil connector
power pin of coil connector
Voltage at 30
Resistance to ground at 87
Resistance to ground at 86
Resistance to ground at 85
I've got a 1997 Dakota SLT with the V6 engine, 2wd, 2 Door+backseat, and its got 317,000 miles on it. The engine will turn over but I have no spark, its got good battery voltage and I replace the crank sensor and coil about a year ago and I replaced the destributor cap and rotor about two years ago. This week I've replaced the cam sensor, spark plugs and plug wires with no results. the relay is good and it seems to be getting power in the right places from the fuse box (you can hear the relay activate if you plug it in with the key in accesory). The primary side of the coil is reciveing very low voltage and both prongs have a connection to ground when both the coil and relay are unplugged. Because of this I believe it could be short to ground or a PCM issue.
Last edited by SkippyG; Dec 19, 2024 at 02:08 AM. Reason: typo
Administrator
Joined: Apr 2010
Posts: 87,267
Likes: 4,197
From: Clayton MI
PCM fires the coil by breaking the ground circuit. Now, I don't know if it should normally ground, with ignition off. Trick would be to see if the PCM is actually switching the ground while cranking. Likely need an analog meter to really test that though.
Low voltage at the coil IS a problem though.
Low voltage at the coil IS a problem though.
I clipped a test light to the postitive of the battery and put the tip in the ground side of the coil wire and it did not flicker. iI was thinknig this was because it was recieving constant ground.
Legend
Joined: Feb 2005
Posts: 8,058
Likes: 183
From: Fort Worth, TX
Power side of the coil comes from the ASD relay. Ground side is pulse interrupted by the PCM, likely using a MOSFET for which the 2.5 ohm value is probably not far off because of leakage and quiescent currents. If you were to remove both battery cables, short them with the key on, that would drain all the systems to zero volts and should open that circuit.
I would check continuity with key off from the coil positive wire to the ASD relay socket and verify the wire isn't damaged AND that there's unlikely to be voltage drop across it.
I would check continuity with key off from the coil positive wire to the ASD relay socket and verify the wire isn't damaged AND that there's unlikely to be voltage drop across it.
