 | Home > Td5 > 2004MY Relays |
 
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| mturri Member Since: 13 Jul 2010 Location: All over Posts: 33   
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Main relay supplies the ECU - which in turn closes circuits to energise both fuel pump & glow plug relays.
The inertia switch is on the coil side of the main relay, likely the reason for its existence? |
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2nd Feb 2019 4:58pm |
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| drakes Member Since: 09 Oct 2009 Location: Hexham Posts: 111  
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Thanks for that, I was thinking of interupting the supply to one the relays as a security measure but did not know which one would be best
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3rd Feb 2019 11:06am |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467 
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IMHO the "main" relay is best, with a hidden switch, or better still a latching relay, that way it will still crank and appear normal but of course won't start with no power to the ECU.
With the latching relay option you'll need to energise it every time you try to start but it saves you forgetting to switch it off to immobilise. |
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3rd Feb 2019 11:11am |
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| benniferj Member Since: 20 Oct 2016 Location: Basingstoke Posts: 361 
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If you isolate the ecu does the alarm still arm? I assume central locking dies along with alarm...
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3rd Feb 2019 5:10pm |
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| drakes Member Since: 09 Oct 2009 Location: Hexham Posts: 111
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Mine is poverty spec, no alarm or central locking.
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3rd Feb 2019 6:02pm |
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| drakes Member Since: 09 Oct 2009 Location: Hexham Posts: 111
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Clive
I see your point about a latching relay so that you do not forget but am not sure how it would work. When you energise the relay with a momentary switch it would latch but what makes it unlatch when you turn the vehicle off |
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3rd Feb 2019 6:23pm |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467
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No, the 10AS alarm ECU works independently from the engine ECU, doesn't affect the locking or alarm functions at all. (Not on a Td5 anyway.) |
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3rd Feb 2019 8:39pm |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467
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Feed the latching relay from a switched ignition source - switch ignition on, activate relay then start. Switch ignition off, relay is de-energised along with the ECU.  |
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3rd Feb 2019 8:43pm |
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| drakes Member Since: 09 Oct 2009 Location: Hexham Posts: 111
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Yes Clive obvious really. I was thinking energise as soon as you get in the vehicle before switching on ignition and could not see how that would work. Should really have thought a bit more before asking the question.
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3rd Feb 2019 8:57pm |
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