heres something just to check i know this will cut off your fuel and let it crank on the relays you took out that you said "looked" all the same unplug them all again and look at the actual plugs they go into and there should be 5slots for each and you will beable to see the metal connections from the top on one of them is there the middle connector missing in the hole if so it requires a 4pin relay and NOT a 5 if it is this case it will not start and i went threw all the same things you did intill i noticed this but mine was on an 89 but could also use a 4pin in a later year

 

On a 5 pin relay, in some applications, pin 87a is not used. So, in practice it is a 4 pin relay. The missing pin in the relay pictured is pin 87a. Pin 87a is used in applications where you control something when the relay is NOT energized.

When testing relays you also test pin 87a as it may indicate relay problems.

 

Not all five pin relays have the center pin 87A. Some are with the 87B, that is a completely different relay.
Anyway if the center pin is not used there is no wire underneath.

No pump and no spark... mmmhh, strange.
Should have at least one.
First thing i would do is jumper the FP relay socket between connector 30 and 87 with a thick piece of wire to see if the FP works, then if the pump turns i would crank it.

The correct ohm reading of an unplugged CPS between the two poles is 200 +/- 75 ohms.

 

Thanks for the info on the relay. I do not recall ever seeing the one you mention. I will keep it in mind.

I have a question on the CPS reading you mention. The info I have is that for a 1996 the readng should be infinity. This reading is for 1991 and later. 1990 and earlier fall within the measurement you mention. Am I wrong here?

Jumping the FP relay is a thought. No spark is still a problem.

 

Wow.. thanks for ALL the help soo far.. its really appreciated.

Ok here is what i found out by doing a volt test on the CPS plug.. (not sensor)..

With the key on i am getting .6 volts it seems to be less than 1 volt... isn't that a PCM issue...

I have a guy who is selling me a pcm off a 89 cherokee xj automatic.. my truck is a 96 xj manual..

would it work, I doubt it because of the OBDII style systems, but figured i would ask?

 

That voltage test, if using the right pins, shows a problem. I just looked at the Jeep and Dodge books to compare. If you used the pins for A n B on the plug it should show 5 volts or 8 volts. My Jeep manual does not specify which voltage it should be.

As best I can tell A= voltage B= ground and C= PCM sense.

The wire colors I have in the book are A= white/black B= Black/light blue and C= red/light green These colors may be different on your vehicle.

So you may have a PCM problem. Hope this info helps.

.

 

What manual are u using? Mine goes up to '92 (HO) and gives those values for the ohmeter.
Could be after '96 the sensor has been changed.

 

The manual I have is a 93-98. Plus some info I found on the net. The net page that I found showed a change in the years that I listed in my past post. I will research this a bit more. Thanks for the reply.

 

IT's ALIVE... IT LIVES....

To everyone who helped me figure this out.. This Forum is fantastic.. thanks for all the assist..

OK so now on to what fixed it and got it running..

Replaced the PCM.. put in one from a 98 xj.. got it for 50.00 on a website (not sure if i am supposed to say it here but starts with a name and ends in list)

The second i put the key in and in the ON position.. I hear the blasted fuel Pump kick in and knew this is it..
Thanks and keep this for future reference.. there is A LOT of very good info on this post.

 

Congradulations. It lives again.

I am glad this ordeal is over.

 

Cool, easy.

 

cool glad its running!

 

Help I have a 97 XJ no spark no fuel no check enging light and can't read codes.

I have no power to the pin 86, key on, in my ASD relay. Is this contriolled by the pcm or the ignition switch?
Where do I go from here?

 

Do the lights on the dash come on? does the engine crank?

 

I have a 96 JGC. No power to fuel pump. I can wire it directly to 12vdc and I can start the vehicle...power to coil, injectors, ckp, CSS, TPS, MAPS. Now, my question is, why no power to fuel pump harness. Should I check the ASD relay as you suggested above? Has new fuel pump relay. New battery. I'm about ready to pull the PCM.