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nicolas0505



Member Since: 23 Dec 2020
Location: briançon
Posts: 79

France 
Coil-engine immobilizer

I'm looking for information on this parts the reference is AMR 4897. Can it break down? and what are the symptoms?

I can't find a store that sells it or can I buy this part?
Post #882780 2nd Feb 2021 9:05pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Can it break down?

this a coil ( only if its open cct )
Post #882793 2nd Feb 2021 10:21pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17378

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It's probably the most reliable component in a fairly unreliable immobiliser system.
Post #882803 2nd Feb 2021 11:24pm
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nicolas0505



Member Since: 23 Dec 2020
Location: briançon
Posts: 79

France 
I was asking because I have intermittent starting problem. when i switch off the ignition and want to start, the engine cranks a little and then stops. if I restart immediately afterwards, it does not even start the engine, but if I switch off the ignition wait a bit ts reviving the engine a bit. I did this several times and after a while I quit. the next day the vehicle restarts normally.it works for a few days and the problem comes back.
Post #882830 3rd Feb 2021 7:48am
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Johan H



Member Since: 12 Oct 2017
Location: Helsingfors
Posts: 36

Finland 
If I understand correctly from your description, I had a similar problem.

When I turned the key the car started, but stopped after a few seconds. I must have tried starting the car for 30 mins, and always the same result. In the end my wife gave it a try, and she noticed that if she let go of the key very slowly and gently the engine kept running.

The problem was in the ignition barrel, the contacts needed a cleaning, still use the same part two years later, ie. if you're lucky the problem might not have anything to do with the immobilizer
Post #882836 3rd Feb 2021 8:15am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17378

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
nicolas0505 wrote:
I was asking because I have intermittent starting problem. when i switch off the ignition and want to start, the engine cranks a little and then stops. if I restart immediately afterwards, it does not even start the engine, but if I switch off the ignition wait a bit ts reviving the engine a bit. I did this several times and after a while I quit. the next day the vehicle restarts normally.it works for a few days and the problem comes back.


This would not be typical of a faulty coil.
Post #882839 3rd Feb 2021 8:38am
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

The transponder coil creates a magnetic field that that excites a coil with in Rf handset this causes the Rf handset to transit a remobilisation code to the 10AS

Coil is only energised when ignition switch is turned to the ignition position and the engine is immobilised


Last edited by dorsetsmith on 3rd Feb 2021 10:26am. Edited 1 time in total
Post #882874 3rd Feb 2021 10:00am
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
2.4 or 2.2 with this problem?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #882880 3rd Feb 2021 10:24am
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nicolas0505



Member Since: 23 Dec 2020
Location: briançon
Posts: 79

France 
the engine is 2.4 and it dates from 2007. I cleaned the 2 contacts the red and green of the ignition switch with contact cleaner the 3rd I could not access
Post #882893 3rd Feb 2021 11:17am
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
OK, it could be a faulty link due to the instrument pack soldering failing. The alarm unit is allowing the starter to crank, but the ECU is not receiving the immobiliser signal.

https://www.defender2.net/forum/post814212.html#814212  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #882927 3rd Feb 2021 1:35pm
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nicolas0505



Member Since: 23 Dec 2020
Location: briançon
Posts: 79

France 
I had seen the trick of making a bridge between 3 and 4, I have not yet tried.

is this normal if I switch off the ignition, leave the key on it and go out and close the door. and like I go back 10 minutes to see 1 hour later.

I put the ignition on and the engine cuts I must unlocked with the plip to restart?
Post #882945 3rd Feb 2021 3:44pm
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