95 Wrangler 4.0 Just shut off - no start - JeepForum.com
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post #1 of 33 Old 08-16-2021, 11:34 AM Thread Starter
RH31379
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95 Wrangler 4.0 Just shut off - no start

My 95 YJ 4.0 has been giving my a no crank issue. I thought it was corrosion on the small lead to the starter because every time I touched it it seemed to work. So I cleaned it an cranked right over, but then suddenly the jeep died in the driveway and will not start. I do not seem to be getting spark. From what I can tell I get 5V between the leads at the coil on run but to not get 12v on crank. I changed the Crankshaft position sensor and no help. The distributor is fairly new.
The jeep just cut out no sputter just off. Could my no crank be a sign that led to this? Maybe ignition stitch? I am not familiar with the 95 with the fuel injection, I was more familiar with the 87 carb version. This one hasn't been to troublesome until now.

Any suggestions would be appreciated.
Thanks!


besides the 83 cj-7, also have an 87 yj, 6cyl., 5spd, weber upgrade, 6.5' western uni mount plow, also a 2000 Sahara, 4.0, 5 spd
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post #2 of 33 Old 08-16-2021, 04:56 PM
fishadventure
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You won’t get spark unless it’s turning over. So first you need to get it turning over.

Is the wire you cleaned the terminals on corroded inside? Do you get any codes? Have you checked the auto shutdown relay?

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #3 of 33 Old 08-17-2021, 02:08 PM Thread Starter
RH31379
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No. the wire looked good. I need to recheck the voltage to the coil. The check engine light turns on so I am communicating with the computer at least. I need to look for codes also.
I swapped the shutdown relay with my starter relay and no change.

besides the 83 cj-7, also have an 87 yj, 6cyl., 5spd, weber upgrade, 6.5' western uni mount plow, also a 2000 Sahara, 4.0, 5 spd
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post #4 of 33 Old 08-17-2021, 03:47 PM Thread Starter
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I just checked and I only have 4 volts to the coil. Also have codes 12,33,24,55
33 is ok, a/c was removed, 55 is end of codes nut looking for some guidance on 12 and 24. Thinking 12 is the problem positive drops out on crank. Ignition switch?
Thanks
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post #5 of 33 Old 08-17-2021, 04:09 PM
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The ASD supplies 12v to coil.
Unplug coil - check wires the DG/OR wire 12v and BK/GY not grounded or showing voltage.

12 Battery Disconnect within the last 50 Key-on cycles.
24 Throttle Position Sensor Voltage High or low.

I do nnot understand your comment about "Thinking 12 is the problem positive drops out on crank"
What 12v drops ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 33 Old 08-17-2021, 04:32 PM Thread Starter
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I have 4.1 volts on left wire (can't remeber colors at the moment) I think its white or gray and the other has continuity to ground key on or off.
As for what I wrote about 12. Thats what I thought instead for the code..that voltage drops out. Maybe I read the wrong thing.
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post #7 of 33 Old 08-17-2021, 04:45 PM
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If I remember correctly 24 is throttle position sensor.

JTEC got there first lol
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post #8 of 33 Old 08-17-2021, 05:03 PM
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might be interesting to check the fuel injectors - they should have 12v form the ASD same circuit.

You did unplug the coil to check for 12v and the other wire for groound or voltage?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 33 Old 08-17-2021, 05:15 PM
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The ASD supplies 12v to coil, alt field circuit, injectors, o2 sensor heater - a WAG check the O2 sensor for grounded.

sorry for the POS diagram but it should help.
Attached Files
File Type: pdf 87-95YJ-Chiltons.pdf (368.0 KB, 8 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 33 Old 08-17-2021, 05:58 PM Thread Starter
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Yes, I unplugged the coil to check the wiring.
The way it died it was like something just blew because I turned the steering wheel and it shut off as quick as if I turned the key.

I'll have to check the injectors for voltage and 02 for ground.
Is there a way to jump the circuit to get it to run?
Thanks!
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post #11 of 33 Old 08-21-2021, 08:39 AM Thread Starter
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Ok.i finally got a change to get back to this. I have 4 volts to the gray wire on the coil. No voltage to the green/or at the coil or injectors. The relay seems to have power constant and switched like its supposed to. If I ground pin 86 I hear the fuel pump run. I'm confused and stuck.
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post #12 of 33 Old 08-21-2021, 03:42 PM
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I don’t have this memorized like some do

But which relay? As or iirc there’s a fuel pump relay and the ASD. Grounding 86 on which?

Also, can’t recall - I think the injectors are not trigger fired but are ground(neg) fired. (Someone correct me?)

Anyway you will only get spark trigger and fuel fire if motor is cranking over (or running but obviously it’s not running) so your test might not have had the correct conditions?

Did you try rotating relays? It seems like something is missing but I can’t place it

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #13 of 33 Old 08-21-2021, 04:43 PM Thread Starter
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After some testing and following circuits I've determined I'm not getting the ground signal from the ecm to trigger the ASD relay to send voltage to the coil, etc.
I traced the wires and there good. Of I ground pin 85 or 86 can't remember been a long hot day. I get 12v to the coil and I hear the fuel pump go. But still no start i think because I'm not getting ground in the computer

My best guess is this means I need a new ECM. Any thoughts if I'm leaning the right way and if so where to get one?
Thank you

besides the 83 cj-7, also have an 87 yj, 6cyl., 5spd, weber upgrade, 6.5' western uni mount plow, also a 2000 Sahara, 4.0, 5 spd
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post #14 of 33 Old 08-21-2021, 05:44 PM
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you started another post for the PCM question.

https://www.jeepforum.com/forum/f12/...w-ecm-4440863/

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #15 of 33 Old 08-21-2021, 06:19 PM Thread Starter
RH31379
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You are correct and I did not know how to link them so I duplicated my post. Thanks for linking them.

besides the 83 cj-7, also have an 87 yj, 6cyl., 5spd, weber upgrade, 6.5' western uni mount plow, also a 2000 Sahara, 4.0, 5 spd
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