Question about 1996 Jeep Grand Cherokee

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My 1996 jeep cherokee sports is turning over but not starting. No voltage to input side of coil. ASD relay seems fine, crankshaft position sensor??

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  • dell818 Feb 12, 2009

    My 1996 Cherokee sport turns over but no power to the coil ,I've changed the coil ,and crank sensor and still no spark

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The CPS is one of the first places to start, but remember that the signal goes thru the ECM first, which ultimately supplies power to the coil, I've had to replace the ECM on my 96 Grand Cherokee 4.0 3 times. The dealer wanted to replace the crack and cam sensors, but it was only the computer that was bad.  Sorry I cant give you any definitive answers but I did get it to turn over when I hit the computer with a wrench!

Posted on Dec 12, 2008

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Hey John how's it going ? First you need to see if there is battery voltage on the dark green an orange wire at the coil ! Do you have a DVOM - digital volt ohm meter ? You can buy one for $10.00 ! Or you could use a test light ! If you have no battery + voltage more then likely you have a bad ASD relay ! Now on the other side of thing's if there is battery voltage you need to see if the PCM is turning it off an on ! This is a white wire at the coil , a test light would work best here . Hook up the clip end to battery positive an the point end hold on the white wire connector end an have someone crank over the engine , the test light should flicker . This indicates the PCM is controlling the coil on an off ! Now if there is no control , more then likely you have a bad crankshaft position sensor ! No Spark Testing control testing

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check fuses yet?
use any scan tool (USA comments)
it tells you 1/2 the time (low voltage side)
why there is no spark
crank for 5 seconds, release key, (not off) see DTCs NOW.
all cars. do this (EFI this check)
4.0L engine.
the PCM makes spark
it uses the CMP/CKP sensor as input, the PCM then creates spark by activation of the Ignitior device that charges the IGNITIION COIL.
did you check for spark at the COIL directly?>?>>>>>>

The PCM will report the bad CKP/CMP
are you using a scan tool (as low as $9 bucks), or working blind.?
also is the ASD relay working right.
the ASD relay is first. after the coil output lug is dead. (found)
is the ASD dropping out after 2 seconds of cranking, BINGO.
when you see it DROP out that is your cue to use a SCAN tool
the tool will tell you why it DROPPED.
as will the immo lamp. in dash...... if you have it.
see ASD here.

http://www.fixkick.com/Jeeps/jeeps.html

if the ASD never closes, there will NEVER BE spark , ever.
see why?

the ASD is odd,
It takes spark to keep spark.!

you are allowed to have spark (blind) for 2 seconds only.

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Heres a brief overview of the ASD.
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Check for good ground.
Good luck...i hope this helps, please rate me a fixya.

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