Thanks Simon. I'm going to have a look at the Nanocom with the existing one today to try and pull off the right part number, will get back to you from there.

No idea who modded this one, wasn't done by me thats for sure, and it doesn't look a particually neat job either.

Whereabouts are you located? Could you either post or pm me some details on what you can offer/prices?

Thanks
Brian

I'd noticed the same, thought I'd found one at a bargin price till I opened the listing to discover the delivery was twice the price of the item, and if anything to go by with my recent experience of a replacement LPG ecu will attract Customs/VAT on top as well.

I'd found the listing on JLR - surprised they still have any left!

I've put enquiries into the few that are breaking on eBay currently, will see what I get come back, one has already said ECU has gone.

Didn't know most Discos were Diesel rather than petrol though. I guess given the target market thats to be expected though.

30382 (the number off the burnt IC) is described as a fuel injection driver chip when looking for it (Ali Express comes up with them). Can't make out the id of the little SMD diode looking component thats burnt from the photo, will have another look tomorrow but given that info with the symptoms I can't see it can be much else.

I was coming back with the same number for the D2 ECU as you list. Given the ecu wasn't properly installed when I did start investigating its been messed around with for sure, all the wires aren't present on the replacement one, nor the little PCB marked BBR I/2000 (and the appearance of them suggested as soon as I opened the case that it wasn't original either).

I can't find any sensible results for the ecu under that part number though. Search continues!

Well it certainly looks like the existing ECU is at fault

I'm guessing this is a sign that the immobiliser on the one currently installed has been bypassed?

As you might guess, the new one doesn't want to talk to the BCU and throws a serial alarm error when you try to start the engine. Its clearly not the right ECU, I need to double check with the Nano tomorrow what part number is shown as being the ecu as what I saw was NNW100880 which doesn't appear to be anything when searched for (suspect I've looked at the wrong screen there).

Looks like possibly the existing ecu is in the wrong case for some reason though.

Well its arrived today, I wouldn't rule out bits being swapped about previously, Its a job for the weekend in any case. Given the price its not the end of the world if it isn't suitable, but V8 Disco 2 ones seem scarce (and some of whats on eBay listed as the engine ECU shows v8/TD5, others show a description of the engine ecu but are actually LPG ecus as well).

Might have to try Roverviews if this one doesn't work as I think he is fairly close to me here anyway.

Thanks

Hi Simon

It may be that the one I've located (by the number on the ecu - which is 0261204901 and NNN100660) isn't actually a p38 one though thats how its listed. Thats the number thats on the one currently fitted. Until Hermes/Evri decide to deliver it, I guess I won't find out!

Does the same part number apply to both ECUs and its just the software loaded onto them that is different? or are they physically/electrically different in some way?

If it is a P38 ecu then how its worked upto now is another question. It does seem the ecu has been messed around with previously (found only one of the retaining plastic nuts on it, and it wasn't located properly on the lugs either, plus some of the wiring looks a bit suspect around it (previous repairs, though nothing actually damaged as far as i can see). I wouldn't say its impossible thats its not the original ecu as there has been a water leak near to the ecu location which may have killed a previous ecu (and possibly hasn't done this one any favours either though its now been sealed and no longer leaks)

Cheers
Brian

New ECU located and on its way now. Managed to find one for £44 including delivery. Looks like the P38 and D2 ECU is identical as the number on the one I have fitted matches the p38 listings as well.

That sounds far too simple! Will have a look what the menu options on the D2 show under both bits. I was expecting it to be somewhat more dificult than that. Need to check which ECU is fitted in any case to identify the best option to replace it with if it matters which one is used.

Evening All

Can anyone advise if they have used Nanocom to swap Motronic V8 ecu from one vehicle to another? The answers I can find on a Google serach seem to suggest its fairly simple to do with a Nanocom but I'm like to see if anyone on here has sucessfully done so?

Is anything needed from the Donor vehicle such as the EKA?

I'm looking to do this on a Disco 2 rather than a p38 as it seems having had the manifold off to check the wiring today that the failure I've got on 4 of the 8 cylinders to get any injection signals appears to be a fault of the ECU rather than the wiring.

Also a related but seperate question, I have access to an oscilloscope to have a look at whats coming out of the ecu in the way of signals, but haven't used one to do so. Can anyone confirm if this is a reasonable thing to try and do and some sort of guide to using it?

jacckk wrote:

BrianH wrote:

Do you have access to a smoke tester? Something like this
https://www.amazon.co.uk/Machine-Automotive-Diagnostic-Detector-Motorcycle/dp/B074JMB6HK/

I don't have one but may be able to get access to one. After a quick search I assume you are suggesting to pressurise the exhaust with it and look for leaks? Sounds a good idea anyway.

Yes exactly that, you don't have the heat issue then. I've used one to locate a vacuum leak on a Vauxhall that wasn't noticable apart from fuel trim errors at idle, once it got a few psi behind it the smoke appeared near the EGR valve, soon lead us to a bolt holding the flange on one site to have a totally stripped thread and whilst it was in the hole, wasn't doing anything useful at all.

Do you have access to a smoke tester? Something like this
https://www.amazon.co.uk/Machine-Automotive-Diagnostic-Detector-Motorcycle/dp/B074JMB6HK/

Should be under P38 > Motronic > Motronic > Inputs > O2 for the sensor value (if you want to see what its reading now you have swapped it), If its logged codes would be a good idea to clear them from Faults as well (faults would be after the second motronic prompt)

Some of those heat recovery systems (Greenwood make one of them fitted to new builds) are designed to provide ventilation whilst minimising heat loss, they consist of some pipework, a heat exchanger and a large polystryene covered box with a condensation drain on the bottom of it. I don't think theres any moving parts involved in them from what I remember, though I think they must have a fan somwhere in the system.

Typical use for them is in new builds to suck air out of the bathroom/kitchen and replace with fresh air whilst keeping as much of the heat as possible through the heat exchanger. The box on them would typically be installed either in the airing cupboard area, or loft space.

Edit - should have made clear, most of the reason for this system appears to be avoiding damp by improved ventalation rather than heating, whilst minimising heat losses.

I briefly did some work on them on a contract a long time back between other work, fitting a modifiication to them on some new build properties.

Well the inertia switch seems to have a common pin (C) and this under normal mode should be connected to the pin at the other end of the connector. In the event its tripped, this connection is broken and the c pin connects to the middle pin instead.

Its looking like the fault above is something being caused by the LPG system - I've cut and rejoined the 4 cylinders halfway along the loom (As to do so at the point they actually interrrupt the petrol injector wiring is under the upper manifold - Not a mistake I'd make again on the Thor, it was a pain breaking into them there and would be much better to come further back on the loom).

It now runs just fine on petrol with the other 4 still connected (it obviously won't run on gas like that, nor does it seem to even try swtiching over as it currently stands)

This was tried as when I attempted to start this morning it appeared fine (with cold engine) and on checking further the lpg ecu was showing signals from 7 of the injectors (the 8th one I'd already disconnected which was injector 2 to try and see if I could tell any difference as I knew which one that was and could get to those wires easliy, not that it seemed at the time to make any difference though that was only with holding the wires together).

I'm guessing its looking like the LPG ecu has failed in some way as there doesn't seem to be any sign of any obvious wiring damage, the connector looks fine when seperated as well.

Interestingly the petrol ECU in the footwell, has definite signs of having had things done to the wiring at some point - several rejoined wires there, I guess this may be where the previous conversion was tapped into at some point. Having cut all the insulation tape off, there doesn't appear to be anything amiss there (and given it runs having done the above, other than it looking awful and needing retaping there can't be much wrong there).

I don't know what to make of the last three messages - I can only guess this is a bug with the Nano? Either way, the intertia switch is ruled out, Will check it with the mutlimeter and confirm what should be seen in the tripped and normal state for info here.

Faults not currently present
P0175 Additive adaptive mixture Correct TRA bank 2 Drive cycle B occured 1 times
P0172 Additive adaptive mixture Correct TRA bank 1 Drive cycle C occured 1 times
P1300 Catalyst damaging misfire, Multiple cylinders drive cycle C occured 4 times
P1301 Catalyst damaging misfire, cyl 1 drive cycle C occured 4 times
P1000 Catalyst damaging misfire, cyl 8 drive cycle C occured 4 times
P0301 Catalyst damaging misfire, cyl 4 drive cycle C occured 4 times
P0303 Catalyst damaging misfire, cyl 3 drive cycle C occured 3 times
Currently present
P0300 emission relevant misfire, multiple cylinders drive cycle C occured 1 times
P0301 emission relevant misfire, cyl 1 drive cycle C occured 1 times
P0308 emission relevant misfire, cyl 8 drive cycle C occured 1 times
And a really odd error
"NA
Occured 0 Times
Signal Too Low
Fault is currently present
Fault determined as intermittent"
And the same but 193 times
And another 193 times but too high

The diagram above is definitely a D2 sunroof, as mine has the retractable blinds shown, The D2 doesn't have the shutter type setup that the p38 does with a fabric finish, its a pair of perforated black roller blinds.

The surround looks the same, I can't remember if mine has the finisher on it or not. It may have been lost before me, or in the 3 years that the headliner wasn't installed in it as well, though I think someone had been trying to fix both the dodgy sunroof setups on it prior to me (not particually well fixed at that either)

It would be easy if I'd done them at a more accessible location! Lesson learnt there, it means taking the upper manifold off if we get that far into it again.

Water leak a possible one - the leak in question was a small hole at the drivers side of the windscreen thats now been filled in so isn't leaking anymore (suspect it was a case of paint scraped off when windscreen was changed prior to my ownership)

Connector looks fine though know what your saying about the connection to some are different pins to others (don't think the D2 is quite so bad in that respect, partly as it has less to connect to in the first place).

I do wonder if it had a metering head type lpg setup on it previously though rather than a true single point setup.

Yes it was working fine up until Sunday evening - Drove around 35 miles in it no problem at all and it literally went as I went to pull away at a set of traffic lights, would barely move from standing and its stayed that way since, It takes longer to actually start, runs badly when it does start and has no power at all (As you'd expect given it seems to not be chucking any fuel in half of the engine really).

Can only see it being a wiring fault due to damage, and theres no noticable evidence of that as yet. I did find on Sunday evening that what I can only assume to be the engine ecu in the drivers footwell on the inside of the wing, appears to be loose for some reason. Couldn't see anything obviously disconnected there, but thats where I guess i'm going to have to start looking when time permits to do so.

Looking at the wiring diagram for the gas ecu, its got two bundles of wires 1-4 and 5-8 as you'd expect, so can't see I did anything different there that could suggest either the ecu itself or the harness.

Power is there - Nano comes to life, it just won't connect to the engine ecu (this did work prior to the recent incident as well).

I've not tried to another ecu in the car, will give that a go when i get back to it again (its not currently at home).

On the lpg front - its definitley had a previous conversion, which definitely had 8 spuds installed in the upper manifold and a hole for the filler in the lower section of the rear wing. This had long gone by the time I got the vehicle, and the guy I brought it from described it as having an lpg tank (which was actually an air tank as it was far too small to be useful as an lpg tank and wrong valvework on it) but no other signs of conversion. I couldn't guarantee that it only had a multipoint system on it and didn't have a singlepoint before. I don't recall seeing any sign of old injector cuts when it was converted with the KME kit but that may be that the wiring was broken into somewhere else.

I'm guessing your thinking an old injector emulator might be still in there somewhere and now misbehaving?

I'm fairly sure the lpg loom goes 1-4 on the drivers side bank, and 5-8 on the passenger side. I remember there being two lots of wires for injector cuts and fairly sure they got installed like that.

I suspect your right, its the lack of diagnostic connection thats got me more puzzled. Will look at it later in the week.
Seems I'm having similar times - Just been looking for the only key to another car, to discover it in the trouser pocket of yesterdays washing.....