 | Home > Technical > Main relay on Defender? ** Car still randomly cutting out ** |
 
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6611   
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Yes I mean the round switch of the end of the barrel.
As the trip comes back to the old value, it isn't an earth or permanent 12V dropping off the instrument pack. Power steering stops as engine is no longer running. What do you mean by signals? Indicators? The ignition dropping out wouldn't affect the front and rear side lights, but it would turn off the headlights, and cut the supply to the brake lights.  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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2nd Oct 2017 3:02pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
wiring diagram for the car anyone can send (2.4)
see link below https://1drv.ms/b/s!AtZSoWFHDgnGhDbxYedTopmyd1rA |
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2nd Oct 2017 3:05pm |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3758
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^ Thank you Dorset
Yes I mean the round switch of the end of the barrel. Thumbs Up - Great I have this on order, I did try wiggling the connectors when the dash board pod was out but this did nothing, I guess the 'workings' are in the switch? As the trip comes back to the old value, it isn't an earth or permanent 12V dropping off the instrument pack. (Thanks, I think) Power steering stops as engine is no longer running. (ok Thanks) What do you mean by signals? Indicators? (pretty sure the indicator (left to pull in did not work) It's happened so quick didn't notice so will check The ignition dropping out wouldn't affect the front and rear side lights, but it would turn off the headlights, and cut the supply to the brake lights. ^ This point is what concerns me... I drive home down some narrow country lanes, even at 40 mph in a de restricted if I lose lights.... Not great as winter is coming... Your recommendation of the switch is hopefully a good one  |
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2nd Oct 2017 3:15pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
also see link below
https://1drv.ms/b/s!AtZSoWFHDgnGjECIf_wOfqrjegKe |
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2nd Oct 2017 3:23pm |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831 
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Sorry I'm a bit late to this conundrum.
Can I ask without getting my head bitten off. Is it lack of fuel to the engine that makes it stop rather than the ignition switch? Don't make old people mad. We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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2nd Oct 2017 4:39pm |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3758
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Hello
I've no idea but would think it would start to splutter? It's just like an off switch no warning etc... Bl__dy annoying 😣 |
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2nd Oct 2017 4:42pm |
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| BenB8man Member Since: 22 Mar 2017 Location: Norfolk Posts: 429 
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Sorry for not replying in the other thread Stacey, I have been paying attention to this one though.
I'd almost certainly say that it's not a fuel issue. Fuel wouldn't cut ignition so you wouldn't see clocks and dials drop. Let alone headlights etc. No head biting
If you really cannot get any further using the information so far though, it's going to be a case of going through each switch or relay within the ignition circuit IMO. If you're not savvy enough (and I'm certainly not) I'd get an auto electrician to go through it. It sounds like it's basically like you're switching off the key whilst your driving, so that should narrow it down somewhat. Really sorry I can't help more. |
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3rd Oct 2017 10:21pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17451
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Have you actually made sure that relay 2 is really tight in its socket and that all four spade terminals are making proper contact. I have seen symptoms like this on more than one 2.4 which have gone away completely after this relay has been properly reseated.
This relay (and indeed the others) should be firm enough in its connector to feel as though when you remove it you are likely to rip the connector off the car rather than the relay from the socket, ie really tight! You may need to extract and close up the female spades from the socket moulding if you have an extraction tool and can do it - somethimes the harness is too restrictive - alternatively put a slight kink in the male spades on the relay. I know that this has been suggested before and you may have done it, but I cannot see in any of your posts confirmation that you have done it. There are relatively few components that can cause these symptoms on a 2.4 amd this is one of the simpler things to rule out. |
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4th Oct 2017 7:38am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6611
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The supply for the dash isn't through a relay so can't see a relay issue causing it; however it's not a bad idea to check them all for poor connections and re-seat anyway.
1988 90 Td5 NAS soft top
2015 D90 XS SW |
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4th Oct 2017 8:24am |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3758
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I have wiggled all the relays (under the seat) and the fuse box but not taken each one out and re seated.
I will try this and change the new man relay I fitted for another new one (as I bought 2) Would the main relay not cause the dials to drop if it failed? Narrowing it down then does the ignition switch look like the culprit? as I have this on order. As the trip does not zero when the car comes back on does this mean the ECU is ok? I will check all the relays soon as my next job and tighten them up, your right about them being tight as the main one I swapped I pulled the thing so hard to get it out... plus its awkward to get a grip on it. Thanks all |
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4th Oct 2017 8:31am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17451
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Yes, I would expect the dials to drop. Are you saying that they don't drop but continue to show engine speed, road speed, etc? If so I confess I missed that in your posts. I will reread your threads when I get a moment. If the engine is cutting out but other things are still working, maybe and intermittent fault with the crankshaft position sensor? This is getting wierder. |
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4th Oct 2017 8:45am |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3758
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Yes the Dials fall to zero, everything off, including engine
revs, speed, fuel all drop down Thanks Last edited by Stacey007 on 4th Oct 2017 8:51am. Edited 1 time in total |
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4th Oct 2017 8:47am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6611
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As in my earlier post, there is no "main relay" really - it's a misnomer.
Most of the ignition circuits are directly switched by the ignition switch. What is referred to as the "main relay" is the one which the ECU controls to provide power for itself and its sensors/actuators/etc. A fault with relay this would mean the engine would switch off, but NOT the dash or any other ignition circuits. The rev counter would drop to zero, various warning lights would come on, but it would not go instantly blank as if the key had been turned off. The dash trip not resetting means we can discount permanent 12V connection or earth connection issue to the dash cluster. An engine ECU fault would not turn the whole dash off, the entire dash is not run by the ECU. Some of the functionality (oil pressure light, rev counter, etc) does come from the ECU, but the dash will happily operate without an engine ECU present (I've done this). 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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4th Oct 2017 8:50am |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3758
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Martin
Would you think the ignition switch is a good candidate for being faulty? Thanks for clarification |
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4th Oct 2017 8:52am |
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