dan__wright
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| posted on 23/8/10 at 10:01 PM |
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aaargghhhhhhhhh!
so, ive spent the last month or so totally re-wiring the car, built the car looms from scratch and re-did most of the ecu wiring too, trying to strip
out the last few bits from it and make it a bit neater.
tonight i started testing stuff and ran into a few probs, check everything for continuity / shorts before connecting battery for first time (only
ignition fuses in) flick the ignition switch on and ... nothing!
after a minute or two realise the keys not in
so take 2, put the kiy in, ignition switch lights up, looking good! clocks dont do the normal trick when they get power of spinning revs up to max, in
fact nothing but the N light ????
ecu main earth sat next the battery disconnected.... sorted that and try again.... result, throttle bodies crank open but realise there's no
fuel pump priming as i forgot to connect it...... clocks still dead!
as i had N on clocks i must have +, checked the ground and nothing, i ran a ground between clocks and one other place that needed it, i forgot to tie
into the main ground, added that and key presto, working clocks, working pump and everything does its pre start movements.
start it up and it started fine, i wired out the 'in neutral to strat' and was worried it wouldnt work so that was good.
turn the ign switch off as there was only a bit of water in it and it carried on running! crap! i haddnt connected the dyno up yet so luckily i just
grabbed the kill switch and it went off.
ive now got to work out why the hell its doing that! even pulled the main ign relay out as i though it could be back feeding but it stayed running,
only pulling the main permanent ecu +12v fuse killed it
once this is done i dont want to see another wire for a few months, and to thing this all started because i needed to splice 2 wires into the ecu
loom!
and breathe!
FREE THE ROADSTER ONE…!!
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PSpirine
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| posted on 23/8/10 at 10:08 PM |
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Have you accidentally got the ECU/Ignition feeding from a permanent +12 or the Acc positin, rather than IGN?
Or you've uncovered a secret ZX diesel engine.
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dan__wright
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| posted on 23/8/10 at 10:12 PM |
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its a switch on the dash not a column switch, its deffo a constant and a ign feed, the strange thing is switching the ign on and off withount starting
the engine is fine, but as soon as you start the engine the ign stays on, they clocks stayed on too so something strange is going on! im wandering if
the perm and ign are wrong way round some where as the N flashed when i put the master switch on which i havent noticed before, normally just the rev
counter spinning.
i did think about the diesel thing too, would be nice if i got the mpg!
FREE THE ROADSTER ONE…!!
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PSpirine
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| posted on 23/8/10 at 10:12 PM |
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Keep in mind that the ECU might be getting a permanent feed from something that's shorting the Permanent to IGN (*Edited to correct*).
This may be a relay in which case the following happens:
Relay gets its feed from permanent +12, and is switched by IGN.
At key off, relay is dead, clocks/ECU dead, only your clock/memory works.
Key to IGN, your relay goes live and connects your permanent +12 to something that's also connected to IGN circuit. Your relay is now
permanently powered, even when you turn key off from IGN.
I've had something vaguely similar happen when I switched fogs using a relay straight from the battery and the connection to the fogs crossed
over an ignition feed going to something else (wipers I think it was). Mine also let out the smoke because when you switched off, everything drawing
current was going through that one poor relay/connection!
[Edited on 23/8/10 by PSpirine]
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dan__wright
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| posted on 23/8/10 at 10:19 PM |
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quote:
Originally posted by PSpirine
Keep in mind that the ECU might be getting a permanent feed from something that's shorting the Permanent to IGN (*Edited to correct*).
This may be a relay in which case the following happens:
Relay gets its feed from permanent +12, and is switched by IGN.
At key off, relay is dead, clocks/ECU dead, only your clock/memory works.
Key to IGN, your relay goes live and connects your permanent +12 to something that's also connected to IGN circuit.Your relay is now
permanently powered , even when you turn key off from IGN.
I've had something vaguely similar happen when I switched fogs using a relay straight from the battery and the connection to the fogs crossed
over an ignition feed going to something else (wipers I think it was). Mine also let out the smoke because when you switched off, everything drawing
current was going through that one poor relay/connection!
[Edited on 23/8/10 by PSpirine]
that was my first though so i pulled out out with it running, no difference! i will fill it with water tommorrow so i can run it properly and check
eveything over, just had enough of it for tonight!
FREE THE ROADSTER ONE…!!
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PSpirine
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| posted on 23/8/10 at 10:27 PM |
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Not your ignition relay.. the relay powering whatever item is causing the cross.
Pull out relays one by one and it'll show you which one is feeding the circuit that is crossing your permanent to ignition.
It'll be something like a horn!
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designer
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| posted on 24/8/10 at 09:28 AM |
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If you do a loom from scratch it is always best to check each circuit as you go; not at the end.
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