i was driving down the freeway and my motor just shut off and now there is no power to the coil, has a newer cps, also just tested it and seemed to be fine. new cmp, new coil. idk what to do!

 

please help i will take any suggestions.. its my dd and i need to get it fixed...

 

Spark route:

12 volts from ignition switch to the ASD relay; when the key is first turned on the PCM provides a ground to the ASD relay to energize it, then the ASD relay passes 12 volts to the coil primary side. If no crank sensor signal is generated after a couple of seconds the PCM cuts the ground to the ASD relay (and fuel pump relay too) and that cuts power to the coil (and fuel pump). Key to START and once again the PCM energizes the ASD relay. Now, a critical element is the crank sensor--no signal from the crank sensor and the PCM won't trigger the coil to provide spark.

 

well i have a spark now just pretty weak..

 

Where are you checking your spark at???? Weak spark from the coil or at the plugs

 

bump

 

Its the fuse under the hood, that happened to me today!!!
I thought for sure it was the fuel pump.
I will post a picture in the morning.

https://www.cherokeeforum.com/attach...1&d=1302268260


Here is the fuse that blew


I guess it isnt the fuse, now every time i turn the key the fuse blows, does your fuse blow too?

 

from the coil it is a weak spark.. but its a newer coil.

 

The #1 suspect for a weak spark is the ignition coil.

You must test that coil to rule it in or out before looking elsewhere.

The ONLY way to test a coils is with a meter and a manual, testing for primary and secondary resistances.

 

I had the same problem and I ended up changing the crank sensor and no it runs like a dream

 

allready changed the crank sensor... and we tested the coil and it checks out fine. its only a couple month old. could it be the pcm shut down on me?