which engine, we cant guess them here.
the TJ book is free.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
the real deal ,even full schematics and every wire color !!
no spark on all cylinders or just one.
if coil is dead, sure,
this is and EFI engine,not some simple 1980 CJ.SORRY!
the EFI has many things that need to work to run.
not just one wire.
the cranking is simple, (old , tried and true, simple)
but not EFI.
so do you have tools, i mean voltmeter and a scan tool>?
if you connected the scan tool and cranked 99% of time
(new engine, new sparkplugs,new wires there)
the PCM will tell you what sensor is dead preventing spark
there are 4 causes. ill list them.
cause one is
fuses blown
cause 2
CEL lamp dead. in cluster, means PCM has no power see number one cause fuse. CEL means check engine lamp....
it glows key on , telling you, hey buddy ECU has POWER.
If car is fitted with factory
immobilizer , is the dash lamp glowing telling you its
Immobilized?
when you crank does the ASD relay close for 3 second min?
fuse 12,6, and 18(coil)
now the sensor side.
1: CMP dead. P3xxx codes. DTC's
2: CKP dead (crank sensor)
3: ignitor dead. (it drives the coil)
4: tacho line dead. (some times is just #3)
hint 2
if the ASD does not close (energize) or closes for 3 second
and drop out
for 100% sure the scan tool tells you why it fail.
not scanning modern cars , you will work blind and fail.
big time. a tool is as cheap as $10 (real scan tool not a bs code reader)
if the scan tool (used) , shows no DTC errors??? live?
cranking for 5 full seconds?
then
fuse 18 blown or coil is bad.
1 min flat, you know.
see?
the below is off the link above. in the wiring section
chapter 8w-30
fuse 18 top left must be good.
the ASD relay must close.
if the scan tool show these errors
see the ASD page, for way.
no starts, or only runs 2-3 seconds, bingo
http://www.fixkick.com/Jeeps/ASD.html
DID i cover this fully? if not ask.
can do each step 1 by 1....
