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Unread 12-24-2012, 07:04 PM   #1
BriansCJ
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1994 XJ Cherokee 
 
Join Date: Dec 2008
Location: South Jersey
Posts: 3,952
My xj died as I was coasting to a stop. I shifted into neutral, and it died. No power at all except the headlight switch. The headlights, tail lights, and interior some lights work.

Gauges and radio don't work. Before it died, it went on and off a few times, turning the radio on and off and the gauges died. I was still driving so it started right back up. The headlights remained on the whole time, they are powered by relays triggered by the factory headlight wiring.

The battery has 13v, engine and chassis ground are good, 13v. All fuses are good. Starter engages when the pins are jumpered and spins the engine.

When I turn the key, I get nothing. It seems as if the computer/pdc has no power at all. I thought it was a bad terminal, I replaced it and the problem persisted. The 15a mini fuse(ignition) in the pdc was blown, I replaced it.

I also tried to clear the codes earlier today, which didn't work, using both ways. I tried leaving it disconnected for a while and putting the positive cable to a ground for 30 seconds. They were for the cts, and fan circuit.

Cliff notes
No power at all except headlights
Starter works.
Connections and fuses good, verified by a multimeter.
15a mini fuse in pdc was blown(ignition)
Tried to clear codes earlier, didn't work.

Also, the last 2 days it's been running rough. Almost sounded like a misfire.

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Unread 12-25-2012, 03:24 AM   #2
Project1
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Any luck getting any codes?

I have no idea what I'm talking about, but it kind of sounds like a ignition key problem, maybe in the steering column. I'm just saying that because when your key is off nothing in your car works but the headlights, you can always turn your headlights on. ??


Also Check your relays like your ASD

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Unread 12-25-2012, 05:28 AM   #3
BriansCJ
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Headlights always work. Im guessing there hooked directly to the battery.
I spent a while swapping relays around.

Its at my aunts house, I'll probably get it towed home and mess with it there.
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Unread 12-25-2012, 03:37 PM   #4
Project1
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No luck with the relays ....

I can't wait to see what caused this .... Ill do some searching and see if I find anything. I looked a little online last night but did see anything
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Unread 12-25-2012, 07:08 PM   #5
BriansCJ
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I got it started and drove it home today.

I think something inside the PDC got fried or lost connection. The 15a mini fuse was not getting any voltage in. I jumpered a wire from my battery to the pin for the fuse and left it hot all the time. The jeep started and I drove it home. I probably wont be able to pull it apart til this weekend.
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Unread 12-25-2012, 07:29 PM   #6
Project1
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Quote:
Originally Posted by BriansCJ View Post
I got it started and drove it home today.

I think something inside the PDC got fried or lost connection. The 15a mini fuse was not getting any voltage in. I jumpered a wire from my battery to the pin for the fuse and left it hot all the time. The jeep started and I drove it home. I probably wont be able to pull it apart til this weekend.

Oh .. awesome ... thats a good start
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Unread 12-25-2012, 07:52 PM   #7
LoveHate
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sounds to me like your ignition switch is bad. try replacing that since its cheap.
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Unread 12-26-2012, 08:10 AM   #8
BriansCJ
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Quote:
Originally Posted by LoveHate View Post
sounds to me like your ignition switch is bad. try replacing that since its cheap.
The ignition switch is good. I tried that first anyway.

Why would the jeep start when I jumper the fuse in the PDC?
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Unread 12-26-2012, 08:22 AM   #9
katuah
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This is a drive-by quickie, but: clockspring? (they have been known to go bad in XJs) or a bad/broken ground wire...

edit to add: I think headlights use a separate ground.
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Unread 12-26-2012, 08:42 AM   #10
rogue12
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Check your connections between the fuse block under the dash on the left side and the where it connects through the firewall on the engine side.

This is a very common spot for unexplainable problems. I have a 93 xj and was having the same problems. This is where I discovered the source of the issues.

Good luck.
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Unread 12-26-2012, 10:12 AM   #11
OnTheFence
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Wait, so this was solved?
You just had to replace the ignition fuse in the PDC.
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Unread 12-26-2012, 10:40 AM   #12
BriansCJ
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It runs, not solved.

The fuse isnt getting power in the PDC. I just ran a wire from the battery to the output part of the fuse. I wont have time to take it apart til this weekend.
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Unread 12-26-2012, 06:03 PM   #13
Project1
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Quote:
Originally Posted by BriansCJ View Post
It runs, not solved.

The fuse isnt getting power in the PDC. I just ran a wire from the battery to the output part of the fuse. I wont have time to take it apart til this weekend.
I know the feeling .. i have been stuck at work for a week strait .... got the jeep just sitting there waiting for some love
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Unread 12-27-2012, 11:54 AM   #14
mnoeltne
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Doesn't the XJ have a fusible link in the main power wire from the alternator to the PDC? That could have blown, which would mean no power to the PDC.
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Unread 12-27-2012, 12:27 PM   #15
BriansCJ
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All of the PDC has power except that 1 fuse. I upgraded all the ****ty stock wires anyway, looks like I'll be doing more of that.
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