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which relay is which?
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Author:  PhilBSpyder [ Wed Feb 08, 2017 11:26 am ]
Post subject:  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.

Author:  gtmdriver [ Wed Feb 08, 2017 5:05 pm ]
Post subject:  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.

Author:  sanzomat [ Wed Feb 08, 2017 9:18 pm ]
Post subject:  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?

Author:  PhilBSpyder [ Wed Feb 08, 2017 10:54 pm ]
Post subject:  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?

Author:  Sven [ Wed Feb 08, 2017 11:46 pm ]
Post subject:  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.

Author:  PhilBSpyder [ Thu Feb 09, 2017 9:45 am ]
Post subject:  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.

Author:  PhilBSpyder [ Fri Feb 10, 2017 3:22 pm ]
Post subject:  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?

Author:  sanzomat [ Fri Feb 10, 2017 9:12 pm ]
Post subject:  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.

Author:  PhilBSpyder [ Fri Feb 10, 2017 11:20 pm ]
Post subject:  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!

Author:  PhilBSpyder [ Tue Feb 14, 2017 4:52 pm ]
Post subject:  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.

Author:  sidewinder [ Thu Feb 16, 2017 12:41 pm ]
Post subject:  Re: which relay is which?

Check Earth connections.

Author:  PhilBSpyder [ Thu Jun 01, 2017 9:00 am ]
Post subject:  Re: which relay is which?

Following on with an ongoing niggle and an afternoon with my mechanic friend. The O2 relay appears to remain live at all times and drains the battery if left in when standing in the garage, which can be easily sorted when we double check today where its supply is coming from, but strangely a second supply has been taken from this relay and goes to a sensor on the water pipe coming out of the manifold area near to the bulkhead on LH side looking forward... any ideas as this as to what this sensor controls and why it is wired into the O2 relay as this is puzzling him?
Beyond this it's summer and the hoods down!

Author:  sanzomat [ Thu Jun 01, 2017 1:46 pm ]
Post subject:  Re: which relay is which?

If I recall correctly there are two sensors where you describe, one with a brown connector and one with a blue. Both are water temperature sensors. I think one gives a signal to the ECU to let it know whether the water is warm (which might well influence the fuelling in terms of richening the mixture like a choke used to do in the old days) and the other feeds the water temperature gauge.

Author:  Jaykart1227 [ Thu Jun 01, 2017 9:12 pm ]
Post subject:  Re: which relay is which?

As sanz says they're water temperature sensors - the brown or black one (on the side of the water outlet) sends info to the ECU, the blue one (underneath the outlet) is for the temperature gauge. Not sure why you'd have a feed from one of the engine bay relays?

I have an engine bay wiring diagram I can email if you think it will help. Its for a MEMS3 engine though which only has 3 engine bay relays. Let me know if you'd like a copy.

Good luck with it.

Author:  PhilBSpyder [ Thu Jun 01, 2017 9:46 pm ]
Post subject:  Re: which relay is which?

Cheers and thanks for the info... the puzzle is why that supply is there and why it has only recently started to cause the problem. We hope to check it all out next week so will see how it goes. Thanks, we have a wiring diagram now so hopefully it will all make sense soonb

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