Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: bagofsand on September 13, 2014, 08:35:22 AM

Title: TJ Immobiliser
Post by: bagofsand on September 13, 2014, 08:35:22 AM

I have check on here for help with my non staring TJ 4.0 auto. I had left it standing for about 9 months and the battery was stone dead, once I put a fully charged battery on it cranked over for ages and eventually started. Drove it on to the drive and parked it when I tried to start it a few days later it would crank but not start. The immobiliser light is on constant so I reckon I have the standard immo / pcm fault. is there any thing else I can try to get it going? what info do I need to check when ordering a usa spec pcm? Thanks for any help.

Title: TJ Immobiliser
Post by: Yakko on September 14, 2014, 08:47:31 AM

Hi.

When I bought my PCM from the US the advice I got was to match the year, engine, gearbox and the colours of the block connectors.

I paid $70 plus shipping, found it on eBay (.com, not .co.uk).

Title: Re: TJ Immobiliser
Post by: bagofsand on September 14, 2014, 12:03:55 PM

Thanks Yakko. is it really just a case of plug and play? no coding or resetting? cheers Iain

Title: Re: TJ Immobiliser
Post by: bagofsand on September 17, 2014, 07:03:26 AM

any more info on this?

Title: Re: TJ Immobiliser
Post by: charlie jeep on September 17, 2014, 12:48:08 PM

I am assuming you tried disconnecting the battery and reconnecting?

Title: Re: TJ Immobiliser
Post by: Cockney Boy on September 17, 2014, 12:53:38 PM

Before you do anything. Get a full scan done . This will be your starting point before pulling your truck apart

Title: TJ Immobiliser
Post by: Yakko on September 17, 2014, 01:20:33 PM

Check the easy stuff first. E.g. Have you tried replacing the battery in the immobiliser remote?

When my immobiliser is still on, my car will start and run for about 2 seconds before cutting out. Is this what you're getting or does it not run at all?

Title: Re: TJ Immobiliser
Post by: bagofsand on September 23, 2014, 08:06:56 PM

hi, I have swapped the remote batteries. jeep wont run at all now, will turn over. no spark at plugs. red light is on solid.

Thanks again

Title: Re: TJ Immobiliser
Post by: Cockney Boy on September 23, 2014, 08:55:40 PM

SCAN !!


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Title: Re: TJ Immobiliser
Post by: Jonny Jeep on September 24, 2014, 09:18:15 AM

My LED has came on constant a couple of times in the past. In both instances I believe it cleared after pressing and holding the button on the control whilst cranking. Engine started and normal operation resumed. I have a Thatcham Cat 1 alarm too and that needs to be turned off first or the Jeep immobiliser doesn't like to turn off.

Title: Re: TJ Immobiliser
Post by: bagofsand on September 24, 2014, 06:52:36 PM

Thanks JJ I will try that.

Title: Re: TJ Immobiliser
Post by: MOCAJ on September 24, 2014, 07:24:17 PM

turn ignition on, red light will be constant, when it goes out press unlock then try to start

try a few times but if it doesn't start PCM might need flashing.

This happened to me after Jeep was stood for a while with no 12 volt and Kev, Bubba had to tow me to local Jeep dealer to sort