Topic: immobiliser problem ?? (Read 6938 times)

MOCAJ · « **on:** July 27, 2008, 07:23:15 PM »

the 97 Tj has been stood for a while so took battery off to charge today whilst i worked on other things.

Tried to start it when battery fully charged but it will run for 2-3 seconds then cut-out, im thinking immobiliser :-?

tried pressing the key fob a million times but same deal

i had a fault code come up-
12- battery has been disconnected
55 end of codes

so any ideas please :smt102

Mike Pavelin · « **Reply #1 on:** July 27, 2008, 09:24:45 PM »

Has it got SKIS?

MOCAJ · « **Reply #2 on:** July 27, 2008, 10:05:05 PM »

It does not have skis, the coded key type

its the one with the square key fob with 2 buttons :wink:

Mike Pavelin · « **Reply #3 on:** July 28, 2008, 07:07:26 AM »

Does the remote turn the red LED on the dash off?

MOCAJ · « **Reply #4 on:** July 28, 2008, 07:09:50 AM »

yes, it turns the light off, engine starts for 2-3 seconds, red light comes back on constant until you press unlock on the fob

MOCAJ · « **Reply #5 on:** July 28, 2008, 07:18:00 AM »

does the immobiliser have its own battery or is it charged from the main 12 volt supply, possibly-

a) it needs to charge up from the 12 v
b) immobiliser battery needs replacing, if so where is it located

just thinking out loud :-?

Mike Pavelin · « **Reply #6 on:** July 28, 2008, 11:17:02 AM »

No, it runs off the vehicle's supply. Does it have the alarm upgrade?

Jonny Jeep · « **Reply #7 on:** July 28, 2008, 12:00:11 PM »

You've had the battery off but did you clean the terminals and clamps up? Bad connections there can cause a lot of problems. Another thing to consider is that the battery could be dead.

If the battery isn't good enough the PCM will not allow the engine to run as it doesn't sense the right voltage/resistance from the battery. I'd get the battery charged again and take it to get it tested properly.

The immobiliser doesn't have a battery so no need to worry about that.

MOCAJ · « **Reply #8 on:** July 28, 2008, 12:46:52 PM »

jj, maybe the batteries fooked then.

I have a mains charger/starter, could try that or just get a new one

mike, not sure on any upgrade :-?

Mike Pavelin · « **Reply #9 on:** July 28, 2008, 10:14:10 PM »

If the battery's strong enough to crank the engine and start it, it's not causing your problem, the engine will keep running even with no battery once it has started. Have you checked for trouble codes again since you charged the battery? If someting is stopping the engine it should show a code unless it is the immobiliser. Trouble is the only way to access the '97 immobiliser is with a dealer's DRBIII scan tool as it is a UK only fitment and only UK dealers have the software.

PtP · « **Reply #10 on:** July 28, 2008, 10:56:51 PM »

I recall I had a similar problem when I replaced the battery on my TJ 18 months back.

I could press the disable button and the engine would run for 2-3 seconds and then cut out. The red flashing light would stay on, but eventually it started okay.

Whilst typing this, I also recall there is a special note in the Jeep papers and this is an extract of what it says:

Quote

Important Note
The Wrangler immobiliser will only work in the vehicle it has been programmed to accept, it does this by checking the vehicle's VIN number upon first turning on the ignition after having its power disconnected i.e.. Vehicle servicing / flat battery etc.. If the Led stays permanently on when the ignition is switched on, the system will need to check the vehicle for its VIN number and compare with its expected VIN number. During this process, which can take upto 20 seconds, the ignition must be left switched ON. Successful comparison is indicated by the LED extinguishing if the vehicle had previously been unimmobilised or by a rapid flashing showing that the vehicle is immobilised.

I hope this helps. :-)

PtP · « **Reply #11 on:** July 28, 2008, 11:03:48 PM »

Just another thought!

Have you tried to disconnect the battery again and reconnect it?

Here is another extract from the same paperwork:

Quote

Functional testing of the immobiliser
To carry out a functional test of the immobiliser. Switch off the ignition and press the lock button on the keyfob. The LED will flash for 15 seconds and then turn to a slow flash every 3 seconds. Turn on the ignition and try to start the vehicle. The vehicle will not crank and visual indication will be given that the vehicle is IMMOBILISED by a rapid flashing of the LED. Turn off the ignition and press the 'unlock' button on the keyfob. The visual indicators will have extinguished if illuminated and the vehicle can now be started in the normal way

PtP · « **Reply #12 on:** July 28, 2008, 11:25:27 PM »

I've also found this:

MOCAJ · « **Reply #13 on:** July 29, 2008, 05:46:26 PM »

will re-charge the battery and try a few of them things.

i know i did not have the ignition on for 20 secs before i tried to start, i just went for it :wink:

MOCAJ · « **Reply #14 on:** August 03, 2008, 01:06:21 PM »

still no joy :-?

just need to get this baby mot'd :twisted:

isle of man · « **Reply #15 on:** August 03, 2008, 02:06:57 PM »

very frustrating when this happens - you could go the usa pcm option or get your local jeep dealer to look at it (the isle of man does not have a franchise jeep dealer) the cost for you would be about the same.
for waggers the shipping to the uk doubled the cost.......hence the usa option.

wrangler · « **Reply #16 on:** August 03, 2008, 03:48:51 PM »

You need a second hand American spec PCM from the same jeep as yours and the same year, then just plug it in and away you go, no more key fob. The PCM cost me $200 and the postage was £35. If you want to go down the new pcm road try this link

http://cgi.ebay.com/ebaymotors/1997-98- ... enameZWDVW

Ps I have emailed this guy on ebay and he was only too happy to help

Hope this helps

Waggers :lol:

MOCAJ · « **Reply #17 on:** August 12, 2008, 07:03:48 PM »

local dealers re-programmed today and alls well for £44 plus VAT, very relieved i can tell you :-D

thanks to Bubba for getting me there :cry:

isle of man · « **Reply #18 on:** August 12, 2008, 07:11:20 PM »

the wonders of a local dealership - lucky sod!!!

MOCAJ · « **Reply #19 on:** August 12, 2008, 07:13:28 PM »

you should forget the mercedes and start one up on the island :wink:

isle of man · « **Reply #20 on:** August 12, 2008, 10:24:59 PM »

Quote from: "my other cars a jeep"

you should forget the mercedes and start one up on the island

cough......cough.....................................cough.......................................cough.

Author Topic: immobiliser problem ?? (Read 6938 times)

Mike Pavelin

Mike Pavelin

Mike Pavelin

Mike Pavelin