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dennis lamb
New User

Jul 12, 2016, 10:13 AM

Post #1 of 6 (687 views)
no power Sign In

1992 doge Dakota 3.9, truck just went bed. I replaced crank sensor, coil and cam sensor. What I've found out is that I have no power to coil and fuel pump. Switch ASD and fuel pump relay and it made no differnece.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 12, 2016, 10:50 AM

Post #2 of 6 (682 views)
Re: no power Sign In

Of course it won't make any difference. You need both of them to run and one powers the other.

We need the whole picture.


All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



kev2
Veteran
kev2 profile image

Jul 12, 2016, 10:59 AM

Post #3 of 6 (676 views)
Re: no power Sign In

check PDC fuse "D" then advise - might want to check them all... don't look at them check them


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 12, 2016, 11:02 AM

Post #4 of 6 (673 views)
Re: no power Sign In

? You know you have no power to fuel pump or coil somehow.


Not strong in these but check for a switch from owner's manual for "inertia" shut down as in if in a collision you don't pump fuel and those on other vehicles the switch can trip for hard bumps or be wrong. Ones I know of you PUSH to reset.


Not sure how this shuts off fuel in a collision - sorry,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 12, 2016, 11:04 AM

Post #5 of 6 (669 views)
Re: no power Sign In

There is no Inertia switch in a Dodge.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jul 12, 2016, 11:18 AM

Post #6 of 6 (663 views)
Re: no power Sign In

The ASD relay is only turned on for a few second when you turn the ignition on. It will stay on continously when the PCM sees a RPM signal. If you checked for power at the coil and injectors with the key on, you won't see power. You need to be cranking the engine when your checking for power at the items the ASD relay sends power to.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jul 12, 2016, 11:23 AM)






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