 | Home > Technical > 2.4 Puma security / cut off / immobiliser |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16856   
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The biggest issue you'll have "cutting off the fuel pump" on a 2.4 Puma is the fact that it's a mechanical pump bolted to the engine!
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24th Apr 2017 10:00pm |
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| stuart123 Member Since: 03 Apr 2017 Location: Manchester Posts: 207 
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Eek! Shows how little I know.
Thought mechanical were a thing of the past... the old 2.25 lightweight I've got has one but assumed newer were electrical!! |
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24th Apr 2017 10:13pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16856
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Td5 is electric, 2.4 is mechanical, 2.2 has an electric lift pump and mechanical hp pump.
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24th Apr 2017 10:28pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720 
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You could fit a manual fuel tap somewhere in the line from the tank to the pump. It'll start but cut out shortly afterwards.
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25th Apr 2017 1:13am |
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| stuart123 Member Since: 03 Apr 2017 Location: Manchester Posts: 207
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Thanks. Any other electrical immobiliser suggestions?
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25th Apr 2017 9:00am |
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2287 
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Hello stuart123
The first question is to Immobilise what... 
Many say 'Battery' but this may (almost certainly will) be needed when the Vehicle is 'Secured'. ECU may be possible, PM route is best if someone knows (really knows... how to do this  ).
Here are two Electrical Immobiliser approaches... To prevent the operation of the Starter Motor Therefore maintaining the Puma Alarm / ECU / Central Locking / Permanent Live feeds (to possible Tracker) 1. Isolation Switch fitted to interrupt the Main 12V (high Amps) Feed to the Starter Motor Example Durite 0-605-20 fitted in chosen location 2 Removable keys ON and OFF positions. 10mm Terminal Studs. 100A @ 24V, 500A for 5 Secs.  Click image to enlarge 2. Isolation Switch to interrupt the S Terminal (Trigger) 12V (low Amps) Feed to the Starter Motor Under Drivers Seat, identify the Starter Relay (No.3) At this Relay identify the Trigger Wire (2.5mm2 Brown / Green Wire Interrupt this and fit a Switch / 12V (low Amp) in chosen location. Click image to enlarge Click image to enlarge
C0151-87 NR 2.5D Brown / Green Wire Good Luck SKIP https://www.defender2.net/forum/topic83242.html |
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25th Apr 2017 10:43am |
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| meeerrrk Member Since: 12 Feb 2017 Location: Surrey Posts: 548 
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I like that idea Skip, fairly simple to execute too. Thanks for the detail. My 90 Project : http://www.defender2.net/forum/topic52774.html
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25th Apr 2017 12:50pm |
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2287
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Bigger Picture... Puma Defender (generally should be this)
Click image to enlarge Click image to enlarge SKIP https://www.defender2.net/forum/topic83242.html |
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25th Apr 2017 2:52pm |
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| stuart123 Member Since: 03 Apr 2017 Location: Manchester Posts: 207
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Thanks all, much appreciated.
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26th Apr 2017 2:08pm |
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| Gurmot Member Since: 01 Apr 2016 Location: Somerset Posts: 36 
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I'm interested in this for my 2.4 Puma also and have found a lack of discussion online for obvious reasons.
I like the idea of interrupting the low power starter circuit but can't the vehicle simply be bump started? How are the 2.4's stopped when the ignition is switched off and can this circuit be used? I've thought about interrupting power to injectors but need to think of a way to doing this without showing signs of mods which could lead a thief to cause. The other thing I've been thinking about is to add a voltage to where it shouldn't be (rather than to interrupt a voltage from getting to where it should be). For example, make the injectors live permanently, to interfere with fuelling and stop it from running if an attempt is made to start without removing the supply fed from a hidden switch. It looks like the modern thief is well able to bypass normal security measures and get ecu's to tell the vehicle to start and perhaps some alternative thinking may make it harder for them? |
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26th Apr 2017 10:42pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720
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just disable the feed to the engine ECU. It's probably better than disabling the starter, as if they're cranking away with the starter it makes noise.
Plenty of places to hide the switch. |
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26th Apr 2017 10:51pm |
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| stuart123 Member Since: 03 Apr 2017 Location: Manchester Posts: 207
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...
Last edited by stuart123 on 27th Apr 2017 8:48pm. Edited 1 time in total |
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27th Apr 2017 8:47pm |
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| stuart123 Member Since: 03 Apr 2017 Location: Manchester Posts: 207
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Where is this feed? |
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27th Apr 2017 8:48pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720
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It's a loose inline fuse bound up in the wiring harness under the drivers seat i believe.
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27th Apr 2017 9:23pm |
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