OIL in the ECU connector...TD5

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battenberg

battenberg

Well-Known Member
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Location
Birmingham UK
Just had the RAC man looking at my TD5 disco, and he found oil in the ECU connector...How does oil get in to the ECU connector is the ECU full of oil?

Puzzled?
 
hi buddy if you do a search on the subject you will find it is a commen problem it usually shows as a missfire or rough running,it tracks down the ecu loom from where it lives in the engine i dont think your ecu will be full of oil or you would have no end of problems it can be cleaned out with electrical contact spray cleaner i think and most sufferes change the ecu loom for an updated,modified loom about£40 i have read,but i am no expert and came across the post whilst researching my poor starting 51 plate td5,hope this helps,cheers phil
 
thanks Phil,

I found this article :Web Rover

that explains it, I thought for a minute that the ECU was full of oil, so it couldnt get full of water (if you know what i mean!)

Still having problems with non starting, anyone know if you remove the ECU, whether it has to be reset?
 
The last post was correct. The loom to the injectors inside cam cover, the oil runs down wires to the ecu. There is usually a miss before it gets to your problem but have seen this many times without the miss.. A modified loom from the injectors to the multiplug just outside cam cover will cure. Turn ecu upside down and give gentle heat with a hair dryer and what oil is there will drip out. Have had to replace a few ecu's but if yours runs the engine it will be ok.
 
walter, not sure if you can help me on another post?

I managed to kill my disco today driving through water. The RAC man thinks it is the ECU as when he tried to read it with his laptop it didnt read at all. the engine will fire for about a second then cut out...

all i get is the yellow engine light on the dashboard.

thought it maybe because i'd disconnected the ecu and it needed a reset or some sort of immobaliser problem??
 
I have a v reg td5 I have a different problem when I go to turn the ignition on it turns the engine over on the first stage of the ignition when normally the lights come on the dash they do but it turns the engine over aswell the starter motor keeps running when it starts there is oil on the red plug on ecu would this cause this problem or do I need to look somewhere else?? Anyone had this or has got any ideas??
 
I'd say that you have two problems there.
The oil in the ECU red plug is due to the seal on the injector harness having degraded and it's allowing oil to run down the wires from the engine towards the ECU. There's plenty about it here on the forum or check out this webpage:- http://www.discovery2.co.uk/Injector_harness.html
Your starter trouble is probably due to the starter relay (relay R2 in the engine fuse box) being stuck closed. I would reckon that's a good place to start looking. Automotive relays are cheap enough, and that one is just plug in.
The only other place which might be at fault is on the back of the ignition switch, but to be honest, that would seem unlikely, but not impossible.
 
brian47 said:
I'd say that you have two problems there.
The oil in the ECU red plug is due to the seal on the injector harness having degraded and it's allowing oil to run down the wires from the engine towards the ECU. There's plenty about it here on the forum or check out this webpage:- http://www.discovery2.co.uk/Injector_harness.html
Your starter trouble is probably due to the starter relay (relay R2 in the engine fuse box) being stuck closed. I would reckon that's a good place to start looking. Automotive relays are cheap enough, and that one is just plug in.
The only other place which might be at fault is on the back of the ignition switch, but to be honest, that would seem unlikely, but not impossible.
Click to expand...

I have not looked in rave, but is that relay swappable with any others? may be a quick and dirty way to check if there is a problem with the relay.

Cheers
 
neilly said:
I have not looked in rave, but is that relay swappable with any others? may be a quick and dirty way to check if there is a problem with the relay.

Cheers
Click to expand...
I wouldn't recommend it with any of those relays except R3 (headlamp powerwash), relay R4 (cooling fan) or relay R8 (Heated front screen).
The rest are just insignificant little circuits like the fuel pump, SLABS, Glowplugs, ABS or the main relay.
So yes, there are a couple.
 
brian47 said:
I'd say that you have two problems there.
The oil in the ECU red plug is due to the seal on the injector harness having degraded and it's allowing oil to run down the wires from the engine towards the ECU. There's plenty about it here on the forum or check out this webpage:- http://www.discovery2.co.uk/Injector_harness.html
Your starter trouble is probably due to the starter relay (relay R2 in the engine fuse box) being stuck closed. I would reckon that's a good place to start looking. Automotive relays are cheap enough, and that one is just plug in.
The only other place which might be at fault is on the back of the ignition switch, but to be honest, that would seem unlikely, but not impossible.
Click to expand...
Ok I will have a look at that just seems really weird that it is causing the Windows to stop working and causing the alarm to go off a guy told me a while back that it's the fuse box under the steering wheel I changed that then it all worked for a day then the problems came back again
 
Michael welch said:
Ok I will have a look at that just seems really weird that it is causing the Windows to stop working and causing the alarm to go off a guy told me a while back that it's the fuse box under the steering wheel I changed that then it all worked for a day then the problems came back again
Click to expand...
As the fusebox is ruled out the next suspect for those symptoms(windows/alarm/starter) is the BCU... unfortunately to rule this out tester is needed cvos is subject of complex programming but it used to suffer from moisture or water ingress
 
Michael welch said:
Ok I will have a look at that just seems really weird that it is causing the Windows to stop working and causing the alarm to go off a guy told me a while back that it's the fuse box under the steering wheel I changed that then it all worked for a day then the problems came back again
Click to expand...

Where did that come from? Nobody mentioned the windows or the alarm going off in your first post. It's very important if you want a sensible answer, LZ members require as much relevant information as you can provide.

I would go with @sierrafery on this now, multiple faults such the ones you are now talking about would probably point towards something in the BCU.
Check it for water ingress first off.
The oil in the injector harness is a totally different fault and it's highly unlikely to have any bearing on the other electrical difficulties.
 
Last edited:
sierrafery said:
As the fusebox is ruled out the next suspect for those symptoms(windows/alarm/starter) is the BCU... unfortunately to rule this out tester is needed cvos is subject of complex programming but it used to suffer from moisture or water ingress
Click to expand...
Fantastic thanks for that where is the BCU located on the discovery 2 is it easy to remove?
 
Behind the glovebox, disconnect the battery before you unplug it and reconnect only after it's plugged back
BCU + IDM.jpg
 
Very helpful thanks very much that has helped me locate the BCU I have now removed the BCU there are a couple more boxes each side of the BCU do I need to get them checked over what do they do? Do you know any one that would be able to fix this BCU would I need to send it off somewhere to be refurbished or replaced?
 

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As i said earlyer this one needs complex programming with dedicated tester made by someone who knows what he's doing while it's on your car c os it has to be sync'd with the engine ECU and others, the other ECUs are not involved in this issue of your's one is for ABS and suspension and the other for ACE... it's hardly a DIY job for someone who is just learning about that...also at this moment is not 100% certain that the BCU is at fault as it's only suspect it can be a wiring issue too, if you can find somebody knowledgeable with nanocom near you then you could get a replacement and fit it, it's a long and complicated story, call this guy tomorrow:
Discovery 2 Parts
Quality Used and New Parts & Accessories
Call Paul on
01206 211623 - office
07828 278465
07760 955966
07840 428888
tell him the issue and he'll explain you in pure english better, check this map https://www.google.com/maps/d/viewer?hl=en&oe=UTF8&msa=0&ie=UTF8&mid=1PmbphOvO47RAsn1ZdQFDD-ed-zo , if you see somebody close to you register to http://www.thed2boysclub.co.uk/ and you can contact him on PM then if you get a known good BCU you'll be able to get it programmed ... another option is this http://turnerdiagnostics.com/land-rover/discovery-2/discovery-bcu-exchange.html , maybe easyer for you but it may be more expensive ... at this point i'm affraid that's about all i can help you. Good luck
 
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