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bunnyman

Member Since: 29 May 2013
Location: herts
Posts: 114

2009 Defender 90 Puma 2.4 HT Galway Green

HELP !!!! immobiliser issue

HI ALL ,
I have a defender tdci 09 (90) , it was towed to garage and I was told starter motor was probably the problem .
Garage are looking into it said they have got starter motor turning but it won’t start think it might be immobilizer.
I have been told there is a possibly of replacing the security imobolizer on tdci if gone down might have to be changed to the upgraded security which is on the 2.2 jaguar tdci engines as the company that makes the old system has closed and carnt get parts .
Has anyone else had this problem?
Thank you in advance

24th Apr 2024 10:25am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 1766

So from what you have written your engine cranks ( starter turns) but does not start. You have a 2009 90 Puma. Your garage suspects the vehicle alarm system is immobilising the engine.

1.your alarm unit will be a Lucas 10AS. A Green unit visible if you remove the drivers footwell speaker and look up through the aperture.

2. On your 2.4 the communications wire from that 10AS goes to the instrument cluster , through the instrument cluster and then on to the engine ECU.

3. The key fob on your key ring interacts with a transponder coil around the top of the ignition barrel , this energises the fob after you switch on the ignition, and gets the 10AS to send the de-immobilisation code to the engine ECU.

So if you suspect the vehicle is immobilised.

1.Check the 3 fuses that serve the 10AS.

If ok.

2. Change fob battery ( cr2032), resync fob ( with doors closed press fob lock button 4/5 times quickly then the fob unlock button once. Doors locks should open to indicate sync has worked

If vehicle will still not start

3.Remove the instrument cluster and disconnect the connector going to it. With a piece of wire bridge pins 3 and 4. With the instrument cluster still disconnected attempt to start vehicle. If it starts the issue is in the instrument cluster and Martin, site owner , can fix that via his busines, or you can remove pins 3 and 4 from the connector and join them together, then refit connector and cluster.

If vehicle will still not start and 10AS is still the suspect.

4. Remove 10AS and send to technozen for test / repair. https://www.technozen-electronics.co.uk/la...-services/

Of course it may not be the vehicle immobiliser, it could be the the camshaft position sensor or the crankshaft position sensor but I’m assuming your garage has ruled them out.

24th Apr 2024 1:37pm

bunnyman

Member Since: 29 May 2013
Location: herts
Posts: 114

Wow thank you for such a detailed response Ianh ,haven’t heard back from garage will keep you posted

25th Apr 2024 9:28am

BrickBox

Member Since: 05 Oct 2021
Location: Wales
Posts: 622

2008 Defender 110 Puma 2.4 USW Zermatt Silver

If it is definitely the immobiliser and you want a permanent solution. I stumbled across this service when browsing.

https://www.empiretuning.co.uk/product/def...r-removal/ 2008 2.4 110 Utility XS.

25th Apr 2024 12:24pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 1766

If the 10AS is faulty you can do several things.

1.Get it repaired by the likes of technozen.

2.Buy a used working one off an auction site / breakers ( need correct version, some have central locking , some don’t, but the latter can be upgraded to support central locking for £45.) then program with diagnostics tool, I.e Nanocom.

3.Buy an alternative one from remotekey

4. Buy a new ALM DHxxxxx unit (10AS replacement) from a Land Rover dealer and have them install it. This is a very expensive option.

4. Decide to have immobiliser mapped out of the ECU by Bell auto services or empire tuning etc. And then replace with an aftermarket immobiliser or immobiliser/ alarm or immobiliser/ alarm / central locking.

If you want to keep things simple and low cost, and it is deemed that the 10AS is faulty, then a repair would seem the easiest option.

25th Apr 2024 12:47pm

hornet

Member Since: 04 Jan 2010
Location: Western Europe
Posts: 325

When you get your hands on a Nanocom, disable Arm on lock, Plip immobilize and Key mobilize. You will have a simple central locking controller now. Should start.

25th Apr 2024 2:17pm

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