Question about 1996 Jeep Cherokee

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My 1996 jeep cherokee will not start. not getting fuel or spark.

I replaced fuel pump relay , asd relay, fuel pump/filter and computer board, still will not turn on fuel pump when ignition is turned on. I am having the same problem with my '96 Cherokee Sport! I did the same as you mentioned and still not getting any fuel. I tried cutting the brown wire from the computer to the relay and grounded it..... got fuel pressure but there is no spark through the ignition coil. Anyone have any other ideas????

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  • hj3ament Jun 01, 2009

    Thanks for the advice. I checked with Jeep forums and found they said to check the crank shaft position sensor also. I replaced it and now my Jeep is back up and running.

  • Richard Scordino May 11, 2010

    If you don't get a crank reference signal, it should shut down the injectors I suggest you check codes and test crank position sensor and possibly cam sensor for proper voltages. If you don't hear the pump, you need to check that everything is properly grounded and also check for actual voltage at the pump. Obviously this isn't a "fix" but it's something to look at.

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  • Jeep Master
  • 6,982 Answers

Great...glad to hear it's up and running!

Posted on Jun 01, 2009

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2 Answers

Diagnostic port on a 1994 jeep grand Cherokee limited v 8


Check the fuel filter,nozzles and clean the injector mouth

Nov 24, 2015 | 1994 Jeep Grand Cherokee

1 Answer

On my jeep cherokee 2.5 crd the automatic shutdown relay doesnt stop the fuelpump from working with the key on. i can hear the asd relay clicking after a few seconds, but the pump keeps on working. th


WOW NO YEAR STATED, not that is challenging......!!!!
its the last thing in the world to change out, and most expensive. of all.
why folks do that, i dont know.
the FSM tells you, all inputs to ECU must be good first.
same with all computers on earth, or outputs will be wrong;
input >>> process>>> output.

you never posted the symptoms? why not?
my guess is ASD issues? what is wrong here.?
i guess you dont know what ASD is , its purpose and functions.
8 ways to mess up.
http://www.fixkick.com/Jeeps/ASD.html

The fuel pump logic is complex.
some work keyon,
some work for 3 seconds, (depends on engine and EFI system options)
lets first say this, most cars have no ASD
they prevent crash and burn by cutting spark and fuel.
and the fuel pump last , in a crash.
enter jeep, they use a silly relay, its not needed but they love it.
my guess is they dont trust ECU logic, ?

So the ASE has the 2-3 second rule. JEEP deal that. 100%
and if you cant get spark good, or the voltages seen in above
link, in 3 seconds, it cuts the ASD,
this relay kills many things, spark and fuel rail 12vdc power feed.
now figure that
bad spark kills spark , funny that , huh>?
but is 100% true.
its a JEEP. on other cars , this never is cut, they cut fuel.

but if the spark read back fails, the ASD is dropped, and that kills spark again and fuel injections (dc rail power)

Btw the ECU logic and programming control all this.
totally. The ASD is just something the ECU controls.

my guess is car is 1996 and newer and you are working
with NO SCAN tool? and failing?
use a scan tool and magic happens, off comes the blinders.
the codes you get will tell you exactly the cause.
of what ever your real unstated symptoms are.

on the newer jeeps failure 8 , a stuck fuel pump relay
can drop ASD.
so..... what year,car.
i can give you the schematic if you state
year.
96-01 is here
click wiring

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service


sadly on jeep books you need to read all ASD pages
to get a full PICTURE.

Aug 19, 2014 | Jeep Cherokee Cars & Trucks

2 Answers

Grand Cherokee stalls when parked in idle or starting through intersection?


I would suggest a fuel pressure test to see if you are getting enough fuel to the engine. If not, then you either have a plugged fuel filter or a failing fuel pump. If you have adequate pressure then something is going on with the fuel injectors.

Jul 03, 2014 | 1991 Jeep Cherokee Limited

2 Answers

My grand cherokee won't start. at fist it would take 2 or 3 times to start up not it will crank all day but will not start up. I was thinking of changing the altenator and starter but now I'm...


SOUND LIKE PROBLEM IN IGNITION SYSTEM OR FUEL SYSTEM. MAKE SURE SPARK PLUGS AND WIRES OKAY.REPLACE DISTRIBUTOR CAP AND ROTOR,REPLACE FUEL FILTER AND AIR FILTER,DO A LITTLE TUNE UP FIRST TO MAKE SURE VECHICLE GETTING GOOD SPARK AND FUEL. IF NOT GETTING SPARK CHECK IGNITION FUSE.IF FUSE OKAY PROBLEM COULD BE IN ASD RELAY OR PCM.CHECK FOR FUEL IF YOU NOT GETTING FUEL CHECK FUEL PUMP FUSE AND RELAY.IF ALL IS GOOD FUEL PUMP COULD BE FAULTY OR PCM. I WOULD HAVE VECHICLE CODE SCAN FIRST TO SEE WHAT FAULT CODES YOU ARE GETTING. DONT GO BUY A LOT NEW PARTS CODE SCANNING WILL KEEP YOU SPENDING A LOT OF MONEY,CODE SCANNING WILL HELP SPEED UP PROCESS TO SEE WHAT CAUSING VECHICLE NOT TO CRANK.YOUR GASOLINE IN FUEL TANK COULD HAVE WATER IN IT PROBLEM COULD BE SOMETHING MINOR.

Oct 31, 2011 | 1993 Jeep Grand Cherokee

1 Answer

1993 jeep cherokee won't start


MAKE SURE DISTRIBUTOR CAP ,ROTOR, SPARKPLUGS AND WIRES, OKAY IF ALL HAS BEEN REPLACED.IF NOT GETTING SPARK PROBLEM COULD BE IGNITION COIL FAULTY, ASD RELAY FAULTY,DISTRIBUTOR WITH CAMSHAFT SENSOR FAULTY OR YOU HAVE FAULTY PCM. CODE SCAN VECHICLE FOR FAULT CODE, IF YOU ARE GETTING SPARK PROBLEM IN THE FUEL SYSTEM, CHECK FUEL PUMP RELAY AND FUSE MAKE SURE FUEL FILTER BEEN CHANGED AND FUEL PRESSURE IS 39 - 41 PSI. CHECK FOR FUEL SPARK SEE WHAT GOING ON, VECHICLE NEEDS FUEL OR SPARK TO RUN IF ONE NOT WORKING ENGINE WILL NOT START.

Oct 31, 2011 | 1993 Jeep Grand Cherokee

1 Answer

Where is the location of the fuel pump reset switch on a 1996 Jeep Cherokee Sport?


You don't have one on there. Pump is turned on and off by the automatic shutdown relay and the pump relay. The crank sensor signal keeps it on. If the asd relay does not get a signal from the computer (from the crank sensor), it turns off the pump relay (and spark).
The pump should run when you first turn the key on. When you start the engine, if the computer gets no signal from the crank sensor it will shut the engine off (no fuel, no spark = off)
If when you first turn the key to on, you can't hear the pump, likely either the pump has failed (check power at the pump harness) or the relay is bad.(swap relay for a known good one and try it).

Apr 17, 2010 | 1996 Jeep Cherokee Sport

4 Answers

No spark and no gas now what


Hi,

If you have no spark and no fuel pump operation,I would strongly suspect the Auto Shut Down relay.
The Auto Shut Down (ASD) Relay supplies power to the ignition coil, fuel injector, electric fuel pump, and the oxygen sensor heater element as long as the key is in the START or RUN position and the Single Module Engine Controller (SMEC) is receiving a reference signal from the distributor.
If the SMEC receives no distributor reference signal for two seconds or more the SMEC interrupts power to the ignition coil, fuel injectors, electric fuel pump, and the oxygen sensor heater element by removing the ASD relay ground.

Thanks for contacting Fixya.

Jul 26, 2009 | 1996 Jeep Grand Cherokee

3 Answers

1998 jeep grand cherokee will not start


Try resetting the asd "auto shut down fuse had a similar problem the jeep would crank but did not get spark or gas also check your fuel pump? and the asd relay may be bad it will prevent the jeep from getting no spark and will not fire some jeeps have security problems

Jun 25, 2009 | 1998 Jeep Grand Cherokee

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