Question about 1992 Jeep Cherokee Briarwood

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1992 jeep cherokee 4.0engine stall problem after 3 to 5 seconds. replaced the crank sensor, put in a used ecu with same part #'s. Key is black & no security

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  • mmcznehas Dec 30, 2008

    The fuel pump is working fine. Thanks! We think it is the ecu that we got lkq, it was out of one that has a securtiy system and we need one that does not have one.

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Replace the fuel pump $300-500

Posted on Dec 30, 2008

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93 Jeep Grand Cherokee, no spark from ignition coil


so gue$$ stinks sure.... why do that.?
all it takes is a scan tool to find this.

first you need to learn ASD relay rules.
to start a jeep 1993 to NOW.
the ASD most close, cranking,does it?
and most stay closed cranking and NOT drop out in 3 seconds.
that means crank for 5 seconds and if the ASD drops. at 3.?
easy huh?
if it did DROP i can tell you the ECU will set DTC errors you failed to see because you did not scan it during those 5 seconds.

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

first is fuses.
lets make a list. works on all jeeps 93+
  1. battery changed. to 12.6vdc reseted.
  2. keyon, CEL lamp glows, if not fuse blown to PCM (ECU)
  3. engine cranks fast.
  4. Asd realy pulls in and holds.
  5. scan tool shows, what? BINGO. DTC errors, easy huh?
  6. ok no DTC, errors, live for 5 seconds, cranking,so lost spark? must be bad coil or wired wrong. (change it 1 wire at a time?ooops)
  7. coil dead, its not DTC caused, so if no DTC that means the PCM did not see Coil ignitor errors. to coil see? i bet its got TDC;s if not then i check the coil inputs. to be sure the PCM ignitor is firing the coil correctly with my scope, oops no scope.
  8. if no scope you get to buy a new PCM. Wild guessing bad ignitor.
  9. i use a Innova 3140 scan too that does 93-95 jeeps, for about $150 only about 1.5 hrs shop labor value. and is Investment grade tool, it would have saved you 3 parts, guessed already.

Mar 18, 2015 | 1993 Jeep Grand Cherokee

1 Answer

Autoshutdown keeps turning on


which engine???????????????????????????
ASD is tricky on jeeps.
The Auto shutdown,relay.
what is it , how does it works is covered in the fsm. read it.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
The ECU runs this RELAY, and if the ECU sees a gross error
it shuts this down, and the schematic there is clear as to what.
both spark and fueling.
here is what can drop it out.
1: crank sensor.
2: cam sensors or TDC ,etc.
3: sees spark dead or weak.
4: Immobilizer active. (failed)

as the book says , make sure spark is good for the 2 seconds cranking. (not after the 2seconds)
the ECU is programmed like this.
user cranks.
ECU creates spark,, using the crank/cam sensors at the time base
for 2 seconds
if the spark read back fails or the 2 sensors fail, the ecu shuts DOWN.
this is for fire prevention.
most other cars just cut the injectors, but not jeep
the drop the MAIN ASD relay.

using the check engine light flash codes, you can see which of the
3 failed, cranking for 5 second and releasing the key on all cars.
1996 and newer a scan tool is use to same effects.

now the 64,000 dollar qustion,
see page 8w-30-4
why does the ASD KILL THE IGNITION coil. easy.
1: it only guess it 2 seconds to make spark
2: if it cant,. it then drops the relay. killing fuel too.
3: this prevents the the crash and burn you see on TV.

so its 2 second permissive system. (or 3?) i forget exact seconds, its in then book and is short.
many dont know this. but is a fact.


now the flash codes.
crank for 5 seconds while in flash code mode
see emmisions page for how.

flash code 11 drops the ASD ! (cam or crank sensor dead)
code 54 cam signal dead?
code 43, spark bad.

Mar 02, 2014 | 1993 Jeep Grand Cherokee

2 Answers

Crank sensor for 1994 jeep laredo


keep it simple first disconnect coil wire from distributor leaving coil connected, put a screwdriver in wire place it away from fan or other moving parts such as belt , and crank engine, u shld see spark. if not u found ur problem. coil needs to be replaced

Feb 14, 2014 | 1994 Jeep Grand Cherokee

1 Answer

Crank sensor for 1994 jeep laredo


why not let the PCM tell you what sensor is bad.
and do the spark test, x 4 x 6? ???
if spark is all bad.
insert the diagnostic jumper wire.
then key on,
then crank for 5 seconds.
release key
flash code will tell you if any of 3 inputs are bad, 2 sensors or spark.
The ECU cuts all fuel if it even THINKS spark is bad.
fact.
why not test spark?/ like we do for 100 years now.
its no secret how.. like 125 million google hits. (what a million hits for every year./ LOL)

this trick works on all cars and jeeps from 1988 to now.
all. all with EFI and jeep used EFI in 1988, I had one,(renix sys)

your next learning path is the ASD relay,
its just a relay that kills injection, and friends.
it drops out of the ECU thinks there is no park for 2 seconds cranking.

Feb 14, 2014 | 1994 Jeep Grand Cherokee

1 Answer

1996 jeep grand cherokee 5.2L v8 is cranking but wont start doesnt look like its getting a spark


Might be your jeep's ecu is bad. Does the check engine light come on your dash, when you turn the ignition key to on, before cranking? If not, the ecu is bad. If the check engine light does come on, it may be the crank sensor is bad on your jeep.

Feb 08, 2011 | 1996 Jeep Grand Cherokee

1 Answer

1993 jeep grand cherokee limited starts for 2-3 seconds then dies. new fuel pump and crank sensor. It will run if ether is sprayed in intake. Fuel pressure is good. Can not "feather" gas...


Sounds like your injectors are not getting any signal from the ecu. Have you checked to see if you have a check engine light that illuminates when you first turn the ignition to on? If no check engine light is lit on your dash, your ecu needs to be repaired or replaced.

Jan 18, 2011 | 1997 Jeep Grand Cherokee

2 Answers

My 98 grand cherokee stalls while driving then has a hard time turning back on. Sparatic problems. I have cleaned throttle body, currently replacing tps sensor, fuel pump is working, air filter is...


either a pick up crank sensor ,or a dodgy fuel pump .But it could be evan a ECU unit playing up or factory immobilisor .hope its something cheap and easy for you though

Dec 02, 2009 | 1999 Jeep Grand Cherokee

2 Answers

Starts ok, but if turn of, will not restart


Try replacing the coolant temp switch. The one that sends signal to the ECU. I hope this helps

Nov 14, 2008 | 1994 Jeep Grand Cherokee

3 Answers

2000 jeep cherokee starts then stalls in approx 3 sec 4.0 has new crank sensor


I am going to assume that it will not run even if you push on the accelerator pedal?
Can you install or attach an old timing light to the spark plug wires, turn it one and try to start it. The light should flash with the engine running, but if it shuts off at time of engine die, and the engine is still spinning, you are losing spark, My suggestion is the cranks shaft sensor on bell housing.
Second, install a pressure gage on the test port on the fuel rail and watch it as you start the engine, fuel pressure should not drop as the engine dies, if it does, the pump is not working correctly. There are two modes of power to that pump, one to start and timed, for only a few seconds to prime the system, and one to run continuously. Find the wires going to the pump at the tank. Connect test light to those wires and watch what happens during crank and at stall, You should not have the pump shut off and the engine dies.
If you have spark, and fuel pump working, when did you last change the filter,,but I put that LAST.
It has to be one or the other of these.
Good Luck

Aug 04, 2008 | 2000 Jeep Cherokee

1 Answer

Engine stalls after starying


I HAD THE same problem.... 87,000 2000 grand cherokee 4.7l
when i let off the gas it might stall. happens 1 to 4 times a day.
so far i have
replaced the crank shaft sensor - it stopped stalling for 3 days $130
cleaned the throttle boddy free
replaced the throttle position sensor $72
replaced the idle air control sensor $132
replaced the map manafold airflow sensor $125
no luck it is still stalling. by the way i have done all the work myself. it was about 30 minutes for most parts
i just ordered a rebuilt ecu or pcu engine control unit. they program in the vin, mileage and part nbr so you gc will recognize it. $185
installed ECU 2 days ago...... so far so good.
good luck

Jul 20, 2008 | Jeep Cherokee Cars & Trucks

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