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[bagofsand]

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.

[Yakko]

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).

[bagofsand]

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

[bagofsand]

any more info on this?

[charlie jeep]

I am assuming you tried disconnecting the battery and reconnecting?

[Cockney Boy]

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

[Yakko]

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?

[bagofsand]

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

[Cockney Boy]

SCAN !!


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[Jonny Jeep]

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.

[bagofsand]

Thanks JJ I will try that.

[MOCAJ]

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