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Relay clicking

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ciaran15



Joined: 23 Mar 2010
Posts: 225
Location: Omagh

PostPosted: Sun Oct 20, 2019 10:43    Post subject: Relay clicking Reply with quote

One of relays under the driver side of my Delica L300 is clicking constantly when I’m driving. it’s driving me nuts. I checked the battery and glow plugs these have all a good strong voltage. Anybody have any idea why it’s doing this? I put a screwdriver to the relays to try and hear which one it is but I can’t determine it sounds like they are all bloody clicking. Any way to pick out the culprit?
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jejoenje



Joined: 20 Aug 2016
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Location: Alloa, Scotland

PostPosted: Sun Oct 20, 2019 11:44    Post subject: Reply with quote

By "constantly clicking" do you mean non-stop or intermittently?
When you say the glow plugs have "good strong voltage" what do you mean, all the time? If so, that's not good...!
You should get a short period of 12v to the plugs before cranking, followed by more periods of voltage of varying levels depending on which glow system you have.
It is the latter sequence/voltage that is driven by two of the relays under the drivers seat; so some clicks on/off a few seconds after first starting is normal, but they should then go quiet.
If one of the relays is clicking continuously after starting (and isn't stopping) that doesn't sound right at all.
Does the van start okay?
I'd first make sure you know which glow system you have.
You could then simply disconnect each relay in turn to see which one is the issue - you'd likely have to do the pre-glow for starting manually.
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ciaran15



Joined: 23 Mar 2010
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Location: Omagh

PostPosted: Sun Oct 20, 2019 13:11    Post subject: Reply with quote

No The glow plugs just get a voltage when I turn the ignition on then it stops. the clicking is intermittent. the van starts fine. it just keeps randomly clicking when I’m driving. I have the two glow plug relay system like other L300s. Will it start if I disconnect one of the glow relays to test? Don’t have a clue about relays all I know is that it’s just clicking like mad.
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jejoenje



Joined: 20 Aug 2016
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Location: Alloa, Scotland

PostPosted: Sun Oct 20, 2019 16:09    Post subject: Reply with quote

ciaran15 wrote:
Will it start if I disconnect one of the glow relays to test ?? Don’t have a clue about relays all I know is that it’s just clicking like mad


It certainly won't be easy to start, and it does depend on which one you disconnect. One of the two is the 6v "afterglow - I reckon without that one, it should be fine to start, particularly when nice and warm already.

Alternatively you could actually just spend some time measuring voltage coming out of each of the relays.
Basically, when it "clicks", it should be either engaging/disengaging so you should be able to measure the output voltage to find out which one is the culprit.

Mind you, this would only tell you which relay is being energised apparently randomly - not why that is happening.
It *might* be because the relay itself is faulty but I would find it hard to believe how that is the case.
Possibly more likely the problem is elsewhere - I think the 6v relay in particular should be energised for short periods depending on engine temperature, conttrolled by the ECU.
So your issue could be with -
- relay itself (may be unlikely as above)
- ECU
- coolant temp sensor
- wiring
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Fostlongstrider
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PostPosted: Mon Oct 21, 2019 7:56    Post subject: Reply with quote

Check connection to the temp sensor which is combined with the guage sensor at the top front of the engine.
If this is bad or sensor faulty it would cause the relay to open and close repeatedly.
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ciaran15



Joined: 23 Mar 2010
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Location: Omagh

PostPosted: Mon Oct 21, 2019 15:26    Post subject: Reply with quote

I think I might have narrowed it down to the temp sensor. I’ve ordered one so I’ll report back whenever I get the new one fitted. thanks for all the help lads.
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andyman



Joined: 08 Dec 2012
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PostPosted: Thu Oct 24, 2019 0:36    Post subject: Reply with quote

Also check that you have coolant around the temp sensor, otherwise it won't get the right heat signal from the hot coolant - has it been allowed to get low?
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ciaran15



Joined: 23 Mar 2010
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PostPosted: Thu Oct 24, 2019 19:28    Post subject: Reply with quote

So I disconnected my temperature sensor and went for a drive. the crazy relay clicking has stopped it just clicks normally now when I turn the engine on. it looks like I bought the wrong sensor though I bought a single pronged sensor and the one I have in my engine is double pronged. Will this work if I just put it in it’s says it was for my engine?
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PostPosted: Fri Oct 25, 2019 9:18    Post subject: Reply with quote

Not sure if they send out the same signal. It wouldn't be two terminals if it didn't need to be.
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jejoenje



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PostPosted: Fri Oct 25, 2019 10:06    Post subject: Reply with quote

I don't know for sure, but I wouldn't be surprised if one of the contacts is the one that would send signal to the ECU, the other to the dash temp gauge. Measure continuity to either plug pin to the ECU?
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ciaran15



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PostPosted: Fri Oct 25, 2019 13:04    Post subject: Reply with quote

okay thanks guys I’ll just get the proper one and fit it. no point in skimping it’s only £16 😆
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Fostlongstrider
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PostPosted: Sat Oct 26, 2019 21:24    Post subject: Reply with quote

jejoenje wrote:
I don't know for sure, but I wouldn't be surprised if one of the contacts is the one that would send signal to the ECU, the other to the dash temp gauge. Measure continuity to either plug pin to the ECU?


That is correct.
Don't know if there is a difference in the values.
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ciaran15



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PostPosted: Sun Oct 27, 2019 8:47    Post subject: Reply with quote

Can’t anyone enlighten me on why there is two sensors going into the head. The one with the two prongs is the temperature sensor I presume but the smaller one just in front of it beside the coolant hose coming from the radiator what’s this one for then?
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ciaran15



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PostPosted: Sun Nov 17, 2019 11:05    Post subject: Reply with quote

Well its definitely the temperature sensor that's causing the mad clicking. Yesterday I was driving and the temp gauge went way up. This morning when I got up I started  the van and as soon as I did the temp gauge went way up inside 30 seconds while engine still cold.
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PostPosted: Tue Nov 19, 2019 10:06    Post subject: Reply with quote

Glad to hear that, lets hope a new one cures your ills!!
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PostPosted: Tue Nov 19, 2019 10:07    Post subject: Reply with quote

Glad to hear that, lets hope a new one cures your ills!!
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ciaran15



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PostPosted: Sat Nov 23, 2019 11:47    Post subject: Reply with quote

Right so I put in a new thermostat sensor and now the clicking is worse than before and the temp gauge is not even moving it's just sat at the bottom wtf is going on. I must have a loose wire or something. Any body any other ideas its driving me nuts I Can't drive around with this constant click click click lol
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ciaran15



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PostPosted: Sat Nov 23, 2019 12:22    Post subject: Reply with quote

I've just noticed as well that the bottom radiator hose is not warming up it's cold don't think the water is being circulated properly
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PostPosted: Sat Nov 23, 2019 15:18    Post subject: Reply with quote

The water pump is known to fail.
They are available and not to expensive.
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PostPosted: Sat Nov 23, 2019 15:19    Post subject: Reply with quote

Or the thermostat stuck, does the engine get warm at all?
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