JekRankin
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| posted on 9/7/12 at 08:26 PM |
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Immobiliser wiring - where to cut circuit?
I wired in my Sterling Excel transponder immobiliser today, and all seems to be working well.
The immobiliser requires two circuit cuts. I cut starter motor and fuel pump.
I'm not confident I've cut the fuel pump at the best place however. I spliced the immobiliser to the live feed for the pump, but I'm
now thinking I should have cut the feed to the fuel pump relay.
Having had a look at the instructions, the immobiliser wiring and circuit cut relay is rated to 18A, but I don't think the R1 pump will draw
this much current. In fact, the R1 ignition fuse is rated at 15A, so my thinking is that all should be ok.
Is my reasoning sound, or should I cut the relay feed instead?
Jek
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big-vee-twin
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| posted on 9/7/12 at 08:32 PM |
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One of the circuits needs to be a 'live' circuit think they are the white wires.
My 'live' circuit isolates the ECU power supply.
The second circuit operates a relay which in turn provides 12v to the injectors, coil and fuel pump.
As you say the relays internally are man enough. I shouldn't worry if its working o.k.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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bi22le
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| posted on 9/7/12 at 10:03 PM |
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I always cut the feed to the pump not the relay.
Try and spread the cut. This means not just cutting a wire and then joining the new ends to the immobaliser. Its too obvious. Actually cut a section
of wire out.
My choice cuts are pump and ignition. You need an ignition feed anyway so you can make a tidy cut with that. If you allow the starter to crank as
normal people will assume it will fire. May buy you valuable seconds as they are cracking it to go and club them over the head!!
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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