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which relay is which? 
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Joined: Tue May 17, 2016 9:48 pm
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Post which relay is which?
Had a problem with the Spyder making a strange noise and identified a relay...Nagares RLPS/4-12... was top one out of box... anyone any idea what it may control.
It could be linked, :?: that earlier this week the battery was flat. This has never happened before. Secondly the engine is sluggish in starting, stalls on first attempt and usually starts on second attempt.


Wed Feb 08, 2017 11:26 am
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Post Re: which relay is which?
In the absence of a wiring diagram you could try removing it and checking to see what doesn't work.

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Wed Feb 08, 2017 5:05 pm
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Joined: Sun Oct 19, 2014 10:10 pm
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Post Re: which relay is which?
Not much to go on there.

Is that a relay from the engine bay black box relay module, the fuse box in/under the dash or the front clam?


Wed Feb 08, 2017 9:18 pm
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Post Re: which relay is which?
It was one of the relays in the engine bay. Managed to get a new one today, fitted and all seems OK.
Still don't really know what it controlled as without it, it started and drove OK. Could have been the immobiliser?


Wed Feb 08, 2017 10:54 pm
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Post Re: which relay is which?
Was it in a black box with 4 relays in. If so they are for the starter, main, fuel pump & O2.
I'd guess that the only one of those that could fail & the engine still run, is the O2 relay.

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Wed Feb 08, 2017 11:46 pm
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Post Re: which relay is which?
Cheers all. It was the box with the four in it, so I guess it was the 02 relay as everything else seemed to work. As said it has been replaced and all seems Ok. Will check later once the frost has lifted.


Thu Feb 09, 2017 9:45 am
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Post Re: which relay is which?
well that didn't work :(
Went out this morning to hear one of the engine relays happily clicking away :D .Only problem is that it shouldn't be as all was meant to be turned off. Battery nearly flat again, so will have to start again. Any suggestions?


Fri Feb 10, 2017 3:22 pm
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Post Re: which relay is which?
Could be an ECU fault. The ECU is meant to keep the main relay powered up for circa 5 minutes after you turn off the engine to allow power to things like cooling fans to stay on. The ECU times this period and is supposed to de-energise the main relay in the black box after that period to turn everything off. I found a couple of forum posts saying that its more likely to be the relay sticking than an ECU fault itself. If the relay is sticking "on" then everything will still work but you will get battery drain. If the relay doesn't switch on then nothing will work so it can't be that. If that is the relay you've changed and you still have the problem then there seems to be 2 options. 1) the ECU is still sending the signal to energise the relay or 2) the new relay is sticking "on" too. The clicking sound could be one of the other relays cycling - if the main relay is on it may warm up the lambda too and that may then switch on and off?

Try pulling the main fuse (or disconnecting the battery). That would reset the ECU. If the relay stays switched off when you reconnect the main fuse then I'd say the ECU is getting confused. If everything is fine until you next run the car and you still get drain next time its switched off then I'd say you are definitely looking at 1) or 2) above.


Fri Feb 10, 2017 9:12 pm
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Post Re: which relay is which?
Cheers for that, it was the conclusion I was coming to, but good to hear from someone else. Will test again with fully charged battery after the weekend and once the snow has gone!


Fri Feb 10, 2017 11:20 pm
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Post Re: which relay is which?
Thanks for the help. So far all seems OK re the main problem. Just wait and see. All I'm left with now is an oil pressure gauge that insists I am running with over 150 pressure.... ie it goes off the scale! Just another wee job to fix, but I had a good blast around the Scottish Borders today... hood down and all sunshine, long may it last.


Tue Feb 14, 2017 4:52 pm
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Post Re: which relay is which?
Check Earth connections.

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Thu Feb 16, 2017 12:41 pm
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