Cranks ok, won't start.
no spark at coil. ! main HV terminal.
checked fuses, no. (that be FIRST)
scan the PCM/ECU, no. (call it ECU from now on)
hopeless lacking scanner but... ok we try,,,,
if the fear of scan tools is so bad, then you get to do it the hard long way. okay.
The ASD relay runs this show, (fuses MUST TEST GOOD)
rule 1, the ASD most close, at key on
the ECU closes the ASD for 2 seconds. to start engine.
if not the ECU sees errors (asd can drop cranked or running)
there are 1 to 8 errors, on this car less, but still many.
if throwing parts blind is good, then new ASD relay?
test 1:
turn key, hear the ASD click we use a stethoscope to hear it.
2 man test, due to 2 second rule.
it must click or its is bad, or lost power to ECU. (fuses) or other power feed issues to ECU. (key switch bad)
what we do , if our scan tool was stolen, (haha) we
measure all 4 ASD pins at the 2 second rule.(a voltmeter)
and the 4 voltages tell 4 things
ASD ok or not OK
or ECU never once turn it on, (more work, lacking scanner)
lots.
http://jeepdied.com/ASD.html
those are the ropes.
fixing cars lacking a scan tool, is like the most hard thing to do.
I can do it, but I have vast tools in my shop.
Even a voltage data logger.... to monitor all ECU pins.
The ECU is just logic, if the inputs are wrong so can outputs.'
GIGO it's called. Garbage in , Garage out.
you cant test for spark like that!
it takes 2 persons, read how the ASD works.
when it stalls. or fails to start
release key then turn it on 3 times
if really really really lucky
the key jive test show the DTC failure
that caused the ASD to go dead or drop.
your test does work on a 1988 but it's got
french renix, ECU, and no ASD, there.
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SOURCE: I have a 1994 Jeep Grand Cherokee Laredo 6 Cyl.
CHECK ASD RELAY THAT IS AUTOMATIC SHUTDOWN RELAY IN THE POWER DISTRIBUTION CENTER UNDER THE HOOD IN ENGINE COMPARTMENT.IF ASD RELAY GOOD PROBLEM COULD BE CAMSHAFT SENSOR IN THE DISTRIBUTOR.TO SAVE TIME AND MONEY HAVE JEEP SCANNED FOR CAMSHAFT SENSOR AND CRANKSHAFT SENSOR FAULTS.
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SOURCE: 1997 Jeep Grand Cherokee dies while driving
If the ignition turns on and dies while driving, you might have a clogged idle air control valve. The valve is located in the throtle body, just below the air intake hose. Locate the idle air control valve, un plug the connector, unscrew it (you will need star screw driver) and next clean it using an electronic contact cleaner spray, I use 3M for that. Next, make sure all cleaning liquid inside is gone (it evaporates quickly) and re assemble it. This should solve your problem once for all.
SOURCE: 93 jeep grand cherokee won't
If you have no spark, the most likely problem is a bad crankshaft position sensor. it is mounted on the bellhousing. below intake/exhaust manifold. held in by 1 bolt. A new CrankShaft position sensor should come with a small pice of heavy paper/ thin cardboard to use to set proper air gap between flywheel and sensor.
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