Help - I removed my Datatool System 3 alarm - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 15 (permalink) Old 04-27-2015, 02:57 PM Thread Starter
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Help - I removed my Datatool System 3 alarm

Oh dear, oh dear. I spent three hours (not the 20-mins suggested by some) un-plumbing my Datatool System 3 alarm from the RC51 this weekend. The principle was simple. Remove all the wires from the Datatool unit that feed into the loom/starter relay and so forth and reconnect any breaks in the original wiring. Sounds simple enough.

But what I'm left with is electrical power but no fuel injection priming or starter motor. Dead as a dodo. I suspect that there's some tricksy bit of wiring related to the immobilising aspect of the alarm, hence why the fuel injection and starter motor have gone AWOL.

Of course, an RC51-owning Datatool installer would be the ideal respondee but I'd love to hear from anyone with some top tips. I wanted the alarm off the bike because it chows down on battery power and I wanted to reduce potential electrical faults. Help!
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post #2 of 15 (permalink) Old 04-27-2015, 04:07 PM
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Unfortunately my friend it is as simple as splicing the cut wires back together. I've lost count of the number of mates and my own bikes I have removed alarms from.

You need to go back and check the continuity of all the wires you have reconnected. Either you have miss connected the wires, or you haven't connected one/some.

I take it you have soldered the joints? Not to cast aspersions on your soldering ability, but are all the joints good?

Hope this helps.

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1994 CBR600 FR (very modified)
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post #3 of 15 (permalink) Old 04-29-2015, 05:08 AM Thread Starter
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Thanks but one more question

BritRC, thanks for that validation. One more question though. Having re-soldered original cut wires that the Datatool was plumbed into, is it also possible that the installer cut wires that were not explicitly tied into the alarm? That's what Ive read elsewhere, with those cut wires wrapped and hidden away. That would mean me unwrapping the loom to find them. Thoughts?
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post #4 of 15 (permalink) Old 04-29-2015, 02:07 PM
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A decent installer will cut the immobiliser wiring back so it can't just be exposed and joined back together easily. Most don't bother doing this, a friend was stunned when I bypassed his Clifford alarm in thirty seconds when it went bad on him while he was out, and he called me to help. Had it been properly installed (it was installed by a Clifford certified installer), I would have taken me ages.

The immobiliser wires should go to two places at least, either ECU, fuel pump, starter, ignition. Check continuity on these circuits, it will be one of these that it causing your issue. You should be able to establish this by the location of the wires you have soldered. Bell them out with a circuit tester, and see which ones are open circuit.

Hope this helps.

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post #5 of 15 (permalink) Old 04-30-2015, 12:36 PM Thread Starter
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Tx

Thanks for the good tips. Will tackle this in the next day or two.
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post #6 of 15 (permalink) Old 05-03-2015, 03:39 PM Thread Starter
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Kind of sorted but not quite...Datatool removal

BritRC, so she fires. The issue is strange. Since removing the Datatool the fuel pump takes a few seconds to start priming, not coming straight on as soon as the kill switch is turned on. I had thought she was dead but in fact it was this big pause before the pump primed. Any thoughts on why that might be so? I appreciate the help. Adam
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post #7 of 15 (permalink) Old 05-03-2015, 03:50 PM
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Sounds like it might be a poor earth or live connection, the pump is the biggest current draw on the bike after the starter
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post #8 of 15 (permalink) Old 05-03-2015, 04:09 PM
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I would check your joints on the fuel pump wiring, sounds like high resistance. As Dan says, also check your earth's. Simple rule of thumb, if it was working before you removed the alarm, you have done something wrong. As I said before, not to cast aspersions on your soldering, but it does sound like an issue with a joint.

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post #9 of 15 (permalink) Old 05-04-2015, 01:46 AM Thread Starter
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Thank you gentleman. Reviewing all connections.
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post #10 of 15 (permalink) Old 05-04-2015, 03:36 AM
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you could try a temporary earth straight onto the pump see if that improves things
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