BCU, ECU & TCU for 4.6 from USA

[Battler]

Hi,

In my search for a BCU I came across this Land Rover Discovery 2 II 03 04 Speedometer ECU BCU TCU Matched SET W SAI 4 6 | eBay (http://www.ebay.com.au/itm/Land-Rover-Discovery-2-II-03-04-Speedometer-ECU-BCU-TCU-matched-set-w-SAI-4-6-/161959201747?hash=item25b5854bd3:g:LRgAAOSwFqJWpun E).

Anybody know if I can fit those to a 99 D2 with a 4.6l?

Cheers

[sierrafery]

IMO yes you can, all those ECUs are completely programmable the only thing you should be cautios with is the stored mileage in the instrument pack and BCU which will be different than your's but as long as you dont force a syncronisation you can decide what to do before ending up with a higher mileage on the odometer if that's the case

[Battler]

Thanks Sierrafery,

Is my Nanacom up to the programming? And will this mean I'll have the 4.6 fuel maps?

[sierrafery]

I presume your nanocom is unlocked for the V8 if that's what you have so it should work OK ... unfortunately i know nothing about petrol engine fuel maps

[ozscott]

Just be careful if your V8 is a manual and that gear (being NAS) is almost certainly auto.

Cheers

[Battler]

Just be careful if your V8 is a manual and that gear (being NAS) is almost certainly auto.

Cheers

Thanks Ozscott,

Mine's is an auto and the "kit" includes the TCU. Also includes the gauges (D2a):)

Cheers

[Pedro_The_Swift]

hmm, will that NA stuff be programmed for SAI?

[Eevo]

ive read that an ECU with SAI wont work without the SAI.

[Roverlord off road spares]

ive read that an ECU with SAI wont work without the SAI.
Also NAS also have rear O2 sensors also.

[Eevo]

copy n pasted from another section


There are quite a few differences between the NAS (North American Specification) and ROW (Rest Of World) 4.0 and 4.6 Discoveries, and P38 Range Rovers.

I have studied them all in great detail for hundreds of hours in order to be able to reprogram them (which I have been doing successfully for over a year now), so the differences will be of interest. I don't want to be accused of promoting my business here, so I'm just going to stick to providing system information or responding to specific non-sales questions here.

The 4.6 Disco II was only sold in the NAS market, and it was fitted with the high-compression version of the engine. All of these vehicles had SAI (Secondary Air Injection) without exception. They were also fitted with a larger AFM (Air Flow Meter) akin to the P38, so they also had a different air filter housing and AFM to plenum trunk to accommodate the physical difference. Therefore putting a 4.6 ECU onto a 4.0 vehicle will not work properly, unless you use the larger AFM and associated parts also.

Using an SAI ECU in a non-SAI vehicle will cause it to put the CEL (Check Engine Lamp) on, although it doesn't always seem to cause them to go into limp-home mode.

There are three part numbers for the hardware versions of the the Disco Motronic ECU, but dozens of different tunes that are loaded into them. The ECU contains only one tune, specifically for the vehicle it was originally programmed for. It also contains the history, programming, and security information for that specific vehicle. Every ECU carries a label from the factory with the VIN number and software number that it was loaded with, unless it is a replacement part.

Note that it is not possible to implant a non-SAI tune into an SAI ECU or vice-versa, since there are enough hardware differences to stop it working. It runs, but really badly with lots of faults flagged. That is quite a pity, although I am continuing my studies to see if that can be overcome. Obviously it will never be possible to put an SAI tune into a non-SAI ECU (and who would want to?) since there are quite a few components not installed.

However it is quite straightforward to reprogram a 4.0 Litre non-SAI ECU with a 4.6 tune for the standard AFM, or even larger engines of the type we see over here (4.8 and 5.0 Litre are well known).

It seems that when BMW owned LR their marketing weasels deliberately nobbled the Disco against the P38 when tuning it, to prevent it being as quick. To that end they knocked a massive hole in the mid-range ignition timing, and it runs Lambda 1.0 across nearly the entire operating range. It does run open-loop at high load - it's just that the target is still Lambda 1.0 apart from the highest load and rev range. The P38 does feature a richer mixture under high load, but again the timing is not optimal.

These engines often pink or detonate because they have too lean a mixture, rather than just being an ignition timing issue. A colder grade of spark plug is good too.

[Eevo]

http://www.aulro.com/afvb/discovery-2/158944-d2-4-6-conversion-owners-4-6-ecu-swap-eoi-2.html

[Battler]

The eBay listing states w/SAI. Given Mark's comments I'm thinking the W stands for without rather than with.

Also, the seller is in South Carolina which is a state that does not require any smog or emission inspections on cars. So I might be lucky!

Due for delivery between 27 April and 10 May.

I'll let you all know the outcome.

[Battler]

The parts have arrived and the transplant is done. The new BCU has fixed the passenger window issue.

No issues except I can't get the BCU to detect the key. I copied the code from the old BCU and it will sync it but not detect it.

Anybody got any idea why that is or a fix?

Cheers

[Battler]

All fixed!

Seems 5mins wasn't long enough for the BCU to connect to the ECU.

Waited 15mins and all is good.

Cheers

[Pedro_The_Swift]

so it now has the standard LR 4.6 fuel map?
great,, are you running the 4.6 RR airbox lid and MAF?

[Battler]

Correct Pedro, 4.6 fuel map and no I haven't done the MAF or the lid.

Put the 03 instrument cluster in today and drove it to pick the kids up from school; very nice:D

Most bizarre thing is it's running cooler. Not sure though if that's because of the transplant or the work I've done on the extractor ports.

[Pedro_The_Swift]

The ECM will be expecting different readings than its getting from that MAF, I would think your exhaust pipe will turn a nice black colour.:D
The 4.6 airbox lid and 4.6 MAF does make a difference;)

[Battler]

Yep, working on that Pedro.

The plan is to buy a knockoff MAF from China to suit the 4.6L Discovery (part number MHK100800) and swap out the sensor if/when it fails.

I'll have to make up new pipes to connect it up as well.

[Mark Adams]

If you want to tell me what the software version is in the ECM (looks like NNWnnnnnn), then I can probably tell you the configuration. I have already seen over 150 versions of the Disco 2 software.

There is also plenty more information available from the original chassis number for the ECM, and if you would care to share that too then I can feed it into MicroCat and see what comes out.

As far as I know, all 4.6 Discos had four Oxygen sensors and were automatic. Nearly (but not quite - thank you Jafir!) all of them had SAI too.

Whatever you do, don't use a junk copy MAF. Genuine items aren't that expensive, and I have never seen a pattern one that is even close to the correct calibration.

[Pedro_The_Swift]

Gees you pop up at the strangest times Mark :lol2:

[Battler]

If you want to tell me what the software version is in the ECM (looks like NNWnnnnnn), then I can probably tell you the configuration. I have already seen over 150 versions of the Disco 2 software.

There is also plenty more information available from the original chassis number for the ECM, and if you would care to share that too then I can feed it into MicroCat and see what comes out.

As far as I know, all 4.6 Discos had four Oxygen sensors and were automatic. Nearly (but not quite - thank you Jafir!) all of them had SAI too.

Whatever you do, don't use a junk copy MAF. Genuine items aren't that expensive, and I have never seen a pattern one that is even close to the correct calibration.

Hi Mark, nice to hear from you.

Here are some numbers from the ECM:

NNN100640
Bosch Software: 1037351818
Production Number: 000033420
Revision Level: 26RT5475

Don't have the original chassis number.

The ECU come from North Carolina which I believe is one of the few states in the US that don't require emission tests on their cars.

Thanks for the tip regarding the MAF. When it arrives I'll swap out the sensor and just use the larger housing. It was only $31 US delivered from China. So, it's bound to be crap.

The car drives much better. Feels more like it use to when I had the engine in my Range Rover with your 4CU Tornado ECM and the Jag airmass meter.

Cheers

[Pedro_The_Swift]

Whats the part number of the sensor Battler?

[Mark Adams]

Hi Mark, nice to hear from you.

Here are some numbers from the ECM:

NNN100640
Bosch Software: 1037351818
Production Number: 000033420
Revision Level: 26RT5475

Don't have the original chassis number.

The ECU come from North Carolina which I believe is one of the few states in the US that don't require emission tests on their cars.

Thanks for the tip regarding the MAF. When it arrives I'll swap out the sensor and just use the larger housing. It was only $31 US delivered from China. So, it's bound to be crap.

The car drives much better. Feels more like it use to when I had the engine in my Range Rover with your 4CU Tornado ECM and the Jag airmass meter.

Cheers
Thanks for the kind words, and the info from your ECM. I guess you read that out with a Nanocom or similar? The ECM does actually contain the Chassis number, and the NNW software number for each time it has been programmed. It is in there, but it looks like the tool cannot read it out.

By now it should be filling up with fault codes too, so I wonder if you have seen any?

The reason I ask is that Revision Level 26RT5475 is usually (but not exclusively) associated with software version NNW503940, which is 4.6 Automatic, SAI, DMTL, Advanced EVAPS, and 4xO2 sensors.
(SAI = Secondary Air Injection, DMTL = Diagnostic Monitoring for Tank Leakage, EVAPS = Evaporative Loss Systems).

Please let me know what you find. :)

[Pedro_The_Swift]

I read somewhere that some double O2 sensor (non SAI) 4.6 ECM's made it to the USA,,

I did ,, honest!
but I think a Lotto win has nothing on finding one,,

[Mark Adams]

I read somewhere that some double O2 sensor (non SAI) 4.6 ECM's made it to the USA,,

I did ,, honest!
but I think a Lotto win has nothing on finding one,,
As far as I know, there were a (very few) non-SAI 4.6 cars, but they all had four O2 sensors.

I am currently doing a lot of work on deleting the unwanted bits (SAI, DMTL, 4xO2) and having some success with it. Some of my friendly clients are already testing this for me, and so far - so good! Hopefully it will be ready for public release by the end of the month (don't hold your breath though, as it is fighting back). ;)

Regarding the MAF Part Numbers:

Disco 2 4.0 Litre only:
Bosch: 0 280 217 532 LR: ERR 7171

Disco 2 4.6 Litre only, and all P38 RR:
Bosch: 0 280 218 010 LR: MHK 100800

[Battler]

Whats the part number of the sensor Battler?

Here it is Pedro: 0280218010 MHK100800.

And here is the link on eBay: MAF Mass Air Flow Sensor Meter for Land Rover MG Rover 0280218010 MHK100800 | eBay (http://www.ebay.com/itm/281766118906)

Cheers

[Battler]

Thanks Mark,

So far only two codes:

P01117 and P00000.

But I've only done about 20 miles in it.

Today I'll be driving it a lot further and maybe more codes will pop up.

It does drive very very nice though, big difference in power particularly lower down.:D

Cheers

[Pedro_The_Swift]

:cool:
a lot of members complain about the lack of power in the LR V8,, but nobody else builds one with as much torque off idle as a Thor. Mine will happily tow the van at 1900rpm,,

[Eevo]

:cool:
a lot of members complain about the lack of power in the LR V8,, but nobody else builds one with as much torque off idle as a Thor. Mine will happily tow the van at 1900rpm,,

i also hear quite often people say the 4.6 ****s all over the 4.0.
it's only 15% difference in displacement but its the key. going from slightly under spec to loads of wiggle room.
LR always put in engines that were too small.
most diesel 4wd's were 3.0-3.6. LR used 2.5.
most petrol 4wd's were 4.8-4.8 LR used 4.0.

im not counting the 4.6 gems in the RR as the disco was the common 4wd and i feel the 4.6gems is about equivalent to the 4.0 bosch


actually it would be interesting to compare the specs of the 4.6 gems to the 4.0 bosch. technology improvement,etc

[ozscott]

Also all the extra capacity is in stroke...and the truth is that long stroke motors are always the way to go for lazy torque. I notice the 4.6 more when fully laden or towing than in normal driving.

There are specs available for the 4.6 Thor because the D2a was sold with it in on the USA. Very good torque figures with that manifold and injection system.

Cheers

[ozscott]

Dont forget though Evo the 4.5 odd litre straight 6 in the 100 series had to less cylinders and about another 600kg being hauled around all the time and in the real world the 6 and the 8 in the 100 series cruiser used a LOT more fuel than a D2 V8.

Cheers

[Eevo]

Dont forget though Evo the 4.5 odd litre straight 6 in the 100 series had to less cylinders and about another 600kg being hauled around all the time and in the real world the 6 and the 8 in the 100 series cruiser used a LOT more fuel than a D2 V8.

Cheers

i'm not overly knowledgeable in the cruisers i'm afraid.

[ozscott]

i'm not overly knowledgeable in the cruisers i'm afraid.

You say that like it's a bad thing :D

Cheers

[Eevo]

You say that like it's a bad thing :D

Cheers

hard to pay them out :p

[schuy1]

At the time LR was building there was I think, a fairly hefty tax penalty for motors over 2.5-3L in the UK and Europe ? Which dictated the market they wanted the most from. The good thing that came of it was some very nice small motors with a reasonable power to displacement ratio.

[Battler]

After a few days of driving I've got loads of codes and always in open loop. Turns out the ECU is from a 03 D2 with SAI. Apparently there is workaround which involves building a secondary air pump simulator to trick the ECU into thinking the pump is there and working.

Might have to go that route if I can't find (struggling to!) a non SAI ECU from the USA.

[sierrafery]

Try a simple trick, see RAVE - Electrical library - Connector views - C0636 pin 16(black/orange wire in the middle plug of the ECU) , splice into this wire with a relay's coil as the other terminal to be connected to an ignition live

i checked the diagram and from pure electronic point of view this is missing for the NAS ECU cos it monitors the SAI pump's relay coil as it manages it through the earth path, the pump itself gets feed through the relay's contact and direct earth so the ECU can't monitor it other way than through the relay's coil.

i know too little about how the V8 engine works but from electronic management point of view this is the conclusion

[Battler]

Thanks Sierrafery, I'm going try that tomorrow.

I really hope this works because I put the 4.0 ECU back in this afternoon and it's a completely different truck.

Cheers

[Battler]

Try a simple trick, see RAVE - Electrical library - Connector views - C0636 pin 16(black/orange wire in the middle plug of the ECU) , splice into this wire with a relay's coil as the other terminal to be connected to an ignition live

i checked the diagram and from pure electronic point of view this is missing for the NAS ECU cos it monitors the SAI pump's relay coil as it manages it through the earth path, the pump itself gets feed through the relay's contact and direct earth so the ECU can't monitor it other way than through the relay's coil.

i know too little about how the V8 engine works but from electronic management point of view this is the conclusion

So is the slice wire from the ECU the output and the ignition live wire the input?

[sierrafery]

It's not about input or output now, it's about the SAI pump relay management, in a nutshell: one terminal of the relay's COIL(85) to live and the other(86) to ECU plug's pin 16, let the contact (30-87) ''in air'' cos on modells with SAI the pump relay is connected like this, it has live on one side of the coil and the ECU is connected to the other side managing it on the earth path if you see what i mean, the non-NAS modells dont have this relay at all... this way the ECU will not "know" that this relay/pump is missing

anyway IMHO if the engine is running well, the fuel consumption is normal, no overheating or excessive smoke you should neglect fault codes and drive it without fear cos if the ECU is missing some input it goes to default without causing damage just that it stores a fault code, like when EGR or wastegate modulator is removed from diesels... though as i said i'm not a V8 man

[Battler]

Thanks again Sierrafery,

Makes sense to me now.

The truck runs really great with the 4.6 ECU. The only issue is it runs open loop constantly and the fuel consumption is around 10mpg around town. I normally get around 13mpg.

It might be because I have only pre cat O2s and not the 4?

[sierrafery]

Unfortunately this is above my knowledge... if the problem is caused by the missing SAI this relay trick should help if it's for some other reason i'm lost

[Pedro_The_Swift]

I'm sure the ECM is defaulting to some preset map without all 4 sensor readings,,

yea, I think the biggest improvement is the 4.6 fuel map,, not the 4.6 crank.

[Pedro_The_Swift]

Hmm, I think the ECM uses the Pre and Post sensors to compare oxygen after the Cat has done its job,, no Post sensor reading will cause a default fuel map regardless of SAI pumps.

[Battler]

I thought the pre cat does the fuel trim and the post cat confirms the cat is working.

Funny thing is I'm not getting O2 codes.

[Battler]

Hmmm, no Black/Orange wire coming out of that plug. I can see it in RAVE 0636 and I've got the right plug; very difficult to locate pin 16.

[sierrafery]

It might be a difference between NAS and other harnesses then if pin 16 is empty.... the pin disposals are shown in the connector view, third from right in the bottom second row ... red in the pic

[Battler]

Ok, after further investigation; that wire is only on vehicles with SAI.

RAVE: 16 BO 18. 16 is the pin, BO is black orange and 18 stands for SAI.

[Battler]

It might be a difference between NAS and other harnesses then if pin 16 is empty.... the pin disposals are shown in the connector view, third from right in the bottom second row ... red in the pic

I'll have look.

Is it possible to pull the plug apart? I can't really see how else I can get a wire in there.

[sierrafery]

That's the description but in reality it's possible to be a wire there but if the pin in the connector is empty improvise and insert a wire through the cavitie as to touch the ECU's pin when you plug it, it's possible with a thin wire

[Battler]

The pin in your pic is empty. Just got to figure out how to get it apart and put in the right connector and I'm in business!

[sierrafery]

Something like this https://www.youtube.com/watch?v=NGQ_I46lZBk , i know exactly how to do it on a Td5 but V8 is different and i've never touched one... if no joy hook a very thin wire to the ECU's pin and plug the connector over it

[sierrafery]

or maybe this https://www.youtube.com/watch?v=fGWnH2I_DpA

[Battler]

Thanks Sierrafery, really appreciating your help.

Ok, I've the a wire into pin 16 and connected to 86. I've got a ignition live wire into 85 and nothing on the other pins.

Went to start and it started then died. Quickly realised I hadn't synced the BCU to the 4.6 BCU (I put both the old BCU in and the old 4 ECU.

[sierrafery]

You wired it well, sync things then we'll see if it helped, normally it should not have any negative effect, eventually no effect in the worst case... PROVIDED the diagram in RAVE is good cos i'm based only on that and i've seen cases when it was wrong, fingers crossed

[sierrafery]

The only issue is it runs open loop constantly and the fuel consumption is around 10mpg around town. I normally get around 13mpg.

It might be because I have only pre cat O2s and not the 4?
I made some investigation on this:

Open loop fuelling
Open loop fuelling does not rely on information from the HO2 S, but the air/ fuel ratio is set directly by the ECM, which
uses information gained from the ECT, MAF/ IAT, the TP sensors and also the vehicle speed sensor (VSS). The ECM
uses open loop fuelling under the following conditions:
l Cold start.
l Hot start.
l Wide open throttle.
l Acceleration.
The ECM uses open loop fuelling to control fuel quantity in all non adaptive strategy conditions. The ECM implements
fuelling information carried in the form of specific mapped data contained within its memory.
Because there is no sensor information (e.g. HO2 S), provided back to the ECM, the process is called an 'open loop'.
The ECM will also go into open loop fuelling if a HO2 S fails.
it's possible that it went to that open loop default cos for the ECU the SAI was unfunctional as it got open load on that relay's coil which was missing... though it might expect some different MAF readings when it activates the SAI and as the pump is missing the air flow will be the same and you'll get some air flow fault code this way, i'm just guessing....we'll see

[Battler]

And the results are in:

While the engine was running I tested the pins on the relay and they both had power.

Engine still running in open loop. I think I may have found the issue though; lefthand O2 has no volts according to Nanocom.

Still have the following codes:
P1000 - Maybe O2 sensor related
P0462 - I don't have a standard petrol tank and the pump is modified
P0483 - Cooling Fan Rationality Check Malfunction (?)
P0451 - Tank again
P0412 - SAI
P0418 - SAI
P0444 - SAI
P1592 - Rough Road

None of them activate the MIL lamp. Although I would have thought the last one would. It might be because I'm still using the old ABS ECU. I'll swap it out later with the one that matches the BCU and ECU from the USA.

So, I'll have a look at the O2 sensor and see if I can see a lose wire or if the connector is full of crap. Failing that I've got a spare O2 I can put in. If that fixes the open issue I'll be happy and not worry about the other codes.

Thanks again for your help Sierrafery

[sierrafery]

Welcome anytime, i'm sorry the trick didnt work though i dunno how that SAI should kick in cos if it kicks in only under load it's normal to have power on both pins cos when the ECU wants to activate the pump it switches earth to the coil, did you test drive it or just started the engine at idle.... erase all codes and go for a hard drive see what you get then, that rough road code is usually irrelevant.

[ozscott]

Its funny but i cannot recall anyone on Aulro conplaining of MIL on, but plenty on Discoweb.

Cheers

[sierrafery]

And the results are in:



Still have the following codes:
P1000 - Maybe O2 sensor related
P0462 - I don't have a standard petrol tank and the pump is modified
P0483 - Cooling Fan Rationality Check Malfunction (?)
P0451 - Tank again
P0412 - SAI
P0418 - SAI
P0444 - SAI
P1592 - Rough Road



So the only codes related to SAI are P0412 and P0418, this one is about this retrofitted relay as open circuit( "Secondary air injection (AIR) pump relay A - circuit malfunction = Wiring, AIR pump relay, ECM") so as long as the wiring you made makes good contact with the ECU pin you should not get any fault code for this, the other P0412 is "Secondary air injection (AIR) solenoid A - circuit malfunction = Wiring, AIR solenoid, ECM" which is normal as long as there is no solenoid fitted, this can be ''emulated'' as well if we find out the solenoid's resistance cos it goes to C0636 - 4(which i presume is empty as well), it's possible that a relay coil there would be good enough but as long as you get the pump relay open circuit code with the relay fitted IMO there's some trouble with the ECU cos you definitely should not get that fault code as long as the ECU is connected to the relay's coil(provided the coil is not interrupted)

P0444 = Evaporative emission (EVAP) canister purge valve - open
circuit not SAI

[Battler]

Progress! Checked my work this morning and it turns out I put the wire into pin 4 instead of pin16. Fixed that and now only the following codes:

P0000 - Temp sensor
P1117 - Temp sensor
P0141 - O2 sensor 2
P0161 - O2 sensor 2

So it looks like I need to trick the ECU regarding the non existing O2 sensors.

Still open loop.

Cheers

[sierrafery]

To me it looks like that ECU is fubar'd cos it stores random fault codes, anyway if you re-read that part i quoted from RAVE about open loop according to these last fault codes it can be caused by the temp sensor malfunction not by the O2 sensor so work on that

strangely when you connected the relay to pin 4 you closed that SAI solenoid circuit but you got open circuit code for that and now with it empty you get nothing:confused: ...that's why the EU is suspect to me

[ozscott]

How is this going Battler?

Cheers

[Battler]

Work in progress. Haven't being able to do anything lately due to work and getting rust removed (from me).

The main issue is a dead O2 sensor causing it to run open loop. Hopefully replacing the sensor will fix it.

[ozscott]

Break a leg mate.

Cheers

[Battler]

It's a fail. Goes really well but running way way too rich.

Now I can't get the original ECU to work. Tried the learn code in the Nanocom and nothing. Tried leaving the key on; one dead D2. If I put the 4.6 ECU back in it starts and runs.

I'll give it another go tomorrow.

[sierrafery]

what fault codes do you get now?

[Battler]

I'm getting the following codes:

Pxxxx permanent voltage supply. Signal too low
P0462 fuel level input error. Signal too high
P0141
P0161

The first one is new; didn't get that yesterday. But yesterday I was getting a code i think was P1117 and something like saying Temp sensor no signal.

Runs really well except when returning to idle it nearly stalls, running open loop and is very rich.

[Eevo]

But yesterday I was getting a code i think was P1117 and something like saying Temp sensor no signal.

Runs really well except when returning to idle it nearly stalls, running open loop and is very rich.

means the ecu doesnt know the temperature of the air going in, and hence, doesnt know the mass of the air going on, and so doesn't know the correct amount of fuel to put in.

[Battler]

means the ecu doesnt know the temperature of the air going in, and hence, doesnt know the mass of the air going on, and so doesn't know the correct amount of fuel to put in.

So, I decided to fit the 4.6 MAF. Now it idles a lot better and doesn't nearly stall when returning to idle. It's nowhere near as rich but it's backfiring occasionally when I try WOT. Scanguage showing 23L per 100k average in the suburbs after about 10ks

Still running open loop.

Codes today are:

P1118 - Radiator temp no signal
P0141 - O2 sensor 2
P0161 - O2 sensor 2

I going to try putting in a resister in the pin in the plug to the ECU and see if I can fool it that it's getting a reading from the radiator sensor. Might need to do a bit more reading up on that first as it way past my level! Any ideas anybody, Sierrafery?

[Eevo]

I going to try putting in a resister in the pin in the plug to the ECU and see if I can fool it that it's getting a reading from the radiator sensor.

why not get the coolant temp sensor working?
will run better if the ecu knows the current coolant temp compared to a fixed value from a resistor.
and will allow it to get closed loop once its above 65 degrees.

[sierrafery]

I'm completely lost seing those random fault codes which are different from one reading to another and the change has no logic as long as there was no intervention in the previously shown fault area... the open loop thing seems to be caused by that missing O2 sensor input cos at least those codes are permannent:

....
The ECM will also go into open loop fuelling if a HO2 S fails.
...

[Battler]

why not get the coolant temp sensor working?
will run better if the ecu knows the current coolant temp compared to a fixed value from a resistor.
and will allow it to get closed loop once its above 65 degrees.

This is a sensor that was only on NAS models located in the bottom of the radiator to measure water temp in that area. So there is no sensor or plug on my UK spec car. So I can't get it working Eevo.

[Battler]

I'm completely lost seing those random fault codes which are different from one reading to another and the change has no logic as long as there was no intervention in the previously shown fault area... the open loop thing seems to be caused by that missing O2 sensor input cos at least those codes are permannent:

I think it just wasn't meant to be.

Now I can't get the original ECU to work. Something going on with the immobiliser and won't learn the code from the BCU (which came with the 4.6 ECU as a matched pair).

[sierrafery]

I think it just wasn't meant to be.

Now I can't get the original ECU to work. Something going on with the immobiliser and won't learn the code from the BCU (which came with the 4.6 ECU as a matched pair).
That's strange, can you communicate with that BCU? ...go into it and disable the immobiliser completely(set to not fitted)

[Eevo]

This is a sensor that was only on NAS models located in the bottom of the radiator to measure water temp in that area. So there is no sensor or plug on my UK spec car. So I can't get it working Eevo.

buy sensor
drill hole
???
profit!

[Eevo]

without that sensor, how will it ever know to run closed loop?

[Battler]

That's strange, can you communicate with that BCU? ...go into it and disable the immobiliser completely(set to not fitted)

Yep, I just finished doing that and it now starts and runs.

Very good tip though as I just stumbled on that by accident. My theory was if I disabled the immobiliser it would start. Nope. So I enabled the immobiliser and then asked the ECU to the learn code. Starts. Thanks.

[Battler]

without that sensor, how will it ever know to run closed loop?

I don't think that has anything to do with it running open or closed loop. I believe in a w/SAI it's used to determine if it's cold enough to turn on the SAI.

I think it's lack of the downstream O2 sensors that's causing it to run in open loop.

I could be wrong though.

I think I might wait for Mark Adams to come with a solution (he is working on one where he converts a 4.6 ECU w/SAI to a 4.6).