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Unread 03-25-2015, 02:36 PM   #1
AshleyAnnZJ
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Wiring Harness Help? 5.9 v8

So while cleaning leaves out of my 5.9's engine compartment I found this plug on the wiring harness buried in the leaves with some clear tape on it. Its behind the fuse box on the passenger side. Its got the male/female connections, but the wires are missing from one end. Everything is running fine so far as I know, I cant find anything loose in the compartment that this might have belonged to this.

Any ideas what this is?

20150324_194309.jpg   20150324_194230.jpg  
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Unread 03-25-2015, 02:54 PM   #2
Timo_90xj
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It's the test port for your E-fan system.

I'd need to check out the pins which is which, but you can test the e-fan operation by pulling the dummy plug off and doing some measuring and/ or jumper-wire things. Don't play around with it too much, if you connect certain two terminals, you will get a short, a mini-fuse in the PDC will burn, and your Jeep won't fire-up. Don't ask me how I know..


edit: Found it. I copied the e-fan wire harness schematic to my picture archive site:

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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 03-25-2015, 03:01 PM   #3
AshleyAnnZJ
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Ok so I'll just shove it back into the spot I found it. Thanks! I was all over that jeep looking for free wires last night
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Unread 03-25-2015, 03:08 PM   #4
Timo_90xj
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You were doing a bit of ghost- hunting then

As for empty wire harness connectors: most vehicles have from a few up to more than a dozen empty connectors all around the vehicle - vehicle manufacturers tend to make only one wire harness version per vehicle body type, so that they can install the wire harness for every one of those vehicles, no matter what the customer wants on it. So, depending on your trim level and amount of optional items/ features ordered, there may be a lot of empty connectors, or almost none.

On the 5.9 Grand Cherokees, most wire harness connectors are in use because our niners were top-of-the-line, and included most of the stuff that were optional on many other ZJs
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 03-25-2015, 03:41 PM   #5
AshleyAnnZJ
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Interesting - years of working on nissans and don't recall ever seeing one. Thanks for wiring harness diagram that'll come in handy I'm sure
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Unread 03-25-2015, 03:58 PM   #6
Timo_90xj
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There may have been hidden ones inside the dash, door panels, under the seats, etc.. not all vehicle manufacturers do it the way Jeep does, but most do. It depends a lot on their harness design though.


5.9 e-fan wire harness is fully independent from the rest of the engine wire harness, but if you ever need to pull it completely out, it's a major pain. I needed to do that last year for thorough inspection at the garage table, because I had some issues with the low speed not working.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 03-25-2015, 06:04 PM   #7
xcaliber81
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Also in that location on 98 was the auto headlight module.
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Unread 03-26-2015, 01:27 AM   #8
Timo_90xj
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Quote:
Originally Posted by xcaliber81 View Post
Also in that location on 98 was the auto headlight module.
What OP posted, is the 5.9 e-fan diagnostic connector, nothing else.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 03-26-2015, 08:38 AM   #9
xcaliber81
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Im not saying it wasnt.
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