No power to coil

MIKEL CAMPBELL

MEMBER
1995 DODGE CARAVAN
3.0L
V6
2WD
AUTOMATIC
200,000 MILES

So I was driving home I was doing fifty five mph the engine just cut out. It turns over fine. I have checked relays and fuses I have no power to coil. I tried to just hot wire it from 12 volt source still no spark. I cannot figure it out. Could it be MAP sensor?

Wednesday, July 25th, 2018 AT 1:42 PM

5 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good afternoon.

The power comes from the PCM for the coil. I attached the wire diagram for you to view.

If you hot wired the coil positive, then you most likely fried the PCM with a back feed.
Roy

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Wednesday, July 25th, 2018 AT 2:00 PM

MIKEL CAMPBELL

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3 POSTS

Thank you for the reply, but did not answer my question. Could the original problem be MAP sensor?

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Wednesday, July 25th, 2018 AT 2:38 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

The answer is no. It most likely will not start now since you tried hot wiring the PCM.

Again, the voltage originates from the PCM, not the MAP sensor.

Roy

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Wednesday, July 25th, 2018 AT 2:41 PM

MIKEL CAMPBELL

MEMBER
3 POSTS

That does not tell me what caused the problem to begin with now does it. That is what I was asking. Thank you

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Wednesday, July 25th, 2018 AT 4:49 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

At this point I do not know since your bypass has fried the PCM. That is where you start. Replace it then you need to recheck for power. If you still do not have it then we can continue with the diagnostic.

Roy

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Wednesday, July 25th, 2018 AT 4:53 PM