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Unread 02-23-2011, 01:07 AM   #1
lee28
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Jeep cherokee help, error code 12

Hi, ive got a problem, when I try to start jeep it doesnt start, everything comes on fine, fans, ect. when I turn key to start it does nothing whatso ever, doesnt click or anything, tried hooking jump leads up to it same thing happens.

I done the code finding and it comes up with an error 12 which I assume is same as this thread.

http://www.jeepforum.com/forum/f13/o...please-918627/

I have looked under the car for the same are but mines looks different to that picture in that thread.

Its a 1995 jeep cherokee sport 4.0l auto. also Im from Australia so Im guessing it might be a different setup.

Thanks for any help, I can take pics of under car if needed, just dont want to pay a fortune to change a sensor.

Thanks for any help.



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Unread 02-23-2011, 06:48 AM   #2
rtrke
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Sounds like you have a bad starter solenoid. You can remove the starter and have it tested for free at most Parts houses. You can look for voltage on the small ignition wire connected to the starter solenoid while someone tries to crank the engine. That will eliminate a problem in your wiring harness or switch.
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Unread 02-23-2011, 07:05 AM   #3
tjwalker
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A code 12 just means that memory to the controller has been cleared within 50-100 engine starts, which can occur whenever the battery terminals are disconnected, battery completely dies, etc. Nothing to worry about really, and it is NOT related to the thread that you found.

Try starting in neutral and also try wiggling the shift lever while turning the key. If either of these techniques allow the engine to turn over, the problem is your "neutral safety switch". Click on this link for the "how to" on refurbishing the neutral safety switch.

http://bc4x4.com/tech/2010/jeep-neut...ty-switch-nss/

And as always, cleaning the battery terminals and battery posts is never a bad idea. You can have resistance which allows some juice through, but not enough to turn over the engine.

If the above doesn't yield any results, get a meter. With the key in the ON position, test for power directly at the starter. It should be approximately the same as the voltage is when measured directly between the neg/pos posts of the battery. If you have 12 volts there, suspect the starter. If you don't have 12 volts, then you need to start working your way back into the engine bay to find out why (ie: voltage drop because of a bad cable, ground, starter RELAY etc).

Let us know what you find!
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Unread 02-23-2011, 07:45 AM   #4
dukie564
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here, i made this especially for you:

http://www.jeepforum.com/forum/f11/starting-system-diagnostics-no-crank-situation-1145815/
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4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 02-24-2011, 01:08 AM   #5
lee28
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Quote:
Originally Posted by dukie564 View Post
here, i made this especially for you:

http://www.jeepforum.com/forum/showthread.php?t=1145815
you do not have permission to access this page. This could be due to one of several reasons:

1. You are trying to access a webpage that is only accessible to Premium Members.
2. You trying to edit someone else's post or access administrative features
3. You did not activate your account. To do so please follow the instructions at the following webpage; Request Activation E-mail


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Unread 02-24-2011, 10:50 AM   #6
dukie564
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well crap, ok try this one then:

http://www.cherokeeforum.com/f2/non-...writeup-71401/
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 03-21-2011, 03:36 AM   #7
lee28
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Hi folks, an update on this problem, after having 4 mechanics look at this problem and none of them having a clue whats wrong.

One said battery terminals, one said fuel filter, One said its the immobiliser and other said no idea.
It keeps happening on and off.
Mate said from work to try tapping starter with hammer and listen for click, tried that and low and behold it clicked after about 30 seconds and started fine!.

So seems its the starter, now next question, how easy it to replace? and can a novice do it? I am away to search forums, just letting you know whats happened.

And so far its cost me $600 and a disconnected immobiliser.
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Unread 03-21-2011, 09:06 AM   #8
bcusstc
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A starter is fairly simple to replace..Can be done with a few sockets and wrenches. If you can change your oil you can change the starter.

Things to remember: Unhook the Battery!, make sure you have all the wires re-attached in their correct places.
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