Since you ran out of gas during autocal it is possible that actual pressure could be very different to the figure you entered before, because even well before it refused to run on gas it could have been just about running on vapour - again check actual pressure and adjust reference pressure to match.

Strange- only took 44.8L and steadfastly refused to take any more. Lot slower to fill than my blue one too.
Yet more little whimsical things to get used to.
Ah well, back to calibration...

Hi
New member here and very interested in info for the AEB 2568D ECU specifically the pinout of the main connector. I have/had a Romano 2568 B installed in my car which has packed up due to a ground fault. I have bought one of the newer 2568D ECU's to replace it as I understand they are just plug and play with the wiring loom is this correct? As this new ECU will have the OBD2 capability can anyone tell me which pins on the main connector and wire colours would be used for OBD2 connection so I can add these to my system

Thanks

Pins are identical so you don't need to have the pinouts, just plug in your new controller to your old loom. You won't have the wires there for the OBD connection as they weren't in the older loom, however, most people that have tried it on a P38 have disconnected the OBD connection as it doesn't work particularly well.

Thanks for the reply and putting my mind at ease with compatibility. Should I want to try the OBD connection you don't happen to know which pins they are so I can add the wires myself?

Thanks

I don't but I'm sure Simon (LPGC) will pop up shortly and tell you a) which pins you need to use and b) why it isn't a good idea.

Another possibility I have been wondering is if it is possible to flash an ECU from one brand to another ie: change mine from Romano to King to give better injector options does anyone know if this is doable?

I must admit after struggling to get the Leonardo software working (finding the right combination of Windows XP, various odd dotNet packages and shit) I've been wondering how hard it would be just to roll my own single-point controller...

This must be a thread I didn't use topic tracker on... Late to reply again sorry.

It''s been a long time since I had to think about which pins are for the OBD connection (back when OBD connection was first introduced the loom didn't carry OBD wires but you got the OBD loom separate with pins already attached to push straight into the connector block). I could check on the pinout but there probably isn't much point - For various reasons good installers generally think it a bad idea to connect the LPG ECU to the vehicle OBD anyway. Never tried it on a P38 but results of doing so on a P38 could turn out to be very much negative unless it's a very late model. Earlier models are not fully OBD2 compatible and although code readers will connect and read live data, the fuel trim info they display might be have long term fuel trims showing at constant -100% or similar. The LPG system would read the same info and interpret it the same way as a generic OBD2 scanner so the LPG system would also read -100% fuel trims, the result of which would see the LPG system subtracting it's maximum range of -20% fuelling from what might otherwise by perfect fuelling.

Onto another question, there are various AEB boards, some look entirely different and contain different sets of components to others. AEB ECU's have been wearing Romano badges for years but King is relatively a newcomer. If the Romano system is an older board it is unlikely that firmware between it and a King ECU would be compatible given the different hardware sets. If the boards are the same year and same spec then if software allowed you to connect to any system it might be more easily possible to change firmware to whichever brand you liked but software doesn't allow that, so although it would be possible it would involve a bit of hacking...and probably not worth the effort when an 8 cylinder AEB ECU these days is about £150... Years ago the same brand ECU only of course of older spec (not truly sequential like modern AEB ECU's and lacking some of the other features too) would have cost over £500!

Other post - Yeah you could make your own single point controller but, like above, would it be worth it (unless you'd be doing it for fun!) when a controller itself is about £50. The AEB175's such as Leonardo's aren't that badly thought out and cover all of rpm detection, stepper motor driving, relay control of solenoids and lambda connection, ability to limit range of stepper motor movement, adjust speed of change of stepper position for rpm, AD converters to read TPS, lambda and much less commonly reducer temp, DA converter for programmable simulation of lambda voltage, serial link to in-cab AEB fuel changeover switch, etc. Not many guts in them but they do a lot for the money and to fully replicate the functionality yourself you'd need to not only make it but program it and maybe write another program for the laptop to adjust it's settings. There are even cheaper controllers (Bingo is one) that have all the basic functionality without the ability to set range of stepper movement or stepper position during over-run, or in fact any sort of connection with a laptop. I've never had problem connecting to an AEB175 using any version of Windows, I have seen some 175's in incorrect branded cases though, e.g. had to connect to a Millenium using Leonado software lol..

Simon

Lpgc wrote:

I have seen some 175's in incorrect branded cases though, e.g. had to connect to a Millenium using Leonado software lol..

The one on my white car says it's a Bigas Pegaso but the Bigas software won't connect whereas AEB Leonardo software will. The one in my latest acquisition says it's an OMVL Millennium and surprisingly, the only software that will connect is the Millennium version. But as the circuit board only slots into the plastic case, there's no way of knowing if the board is in the original box.

Thanks for that Simon my car isn't actually a Range Rover it is a "cough cough" 2003 Jeep V8 HO do you know if this would work with the OBD interface I would like to monitor fuel trims from the laptop as I am getting a flat spot in the mid rev range and am sure its going lean not just on gas but petrol also just more pronounced on gas if you could tell me the pin numbers it would be great so I can have a look what's happening.

WJ Overland? I looked at some of those but ended up with a P38 :) nice motors but I couldn't find a nice one, if you see what I mean.
I think Simon has some relevant advice on fuelling the midrange on those, or was it something to do with PRINS? Anyway, I'm sure he'll be back :)

Either way, OBD doesn't add much to LPG installs for reasons that have been explained a few times on the LPG forum, but boil down to lag. If the Petrol system makes a change to cope with a transient condition the LPG will then try to correct itself as well but the conditions will have changed so it ends up chasing the needle.

If I were you I'd get a cheapo Bluetooth OBD adaptor and the paid version of Torque for your phone. You'll have a readout of your ST/LT trims really quickly with the minimum messing about.

Blimey Morat, you're beginning to sound like you know what you are talking about. Or is it that you are a theoretical man, you know how it should be done, just aren't able to do it (bit like the rest of us when it comes to snooker, you know how to make the amazing shot but can never actually demonstrate it in practice)?

I'm happier with computers than spanners :)

rickrwg wrote:

Thanks for that Simon my car isn't actually a Range Rover it is a "cough cough" 2003 Jeep V8 HO do you know if this would work with the OBD interface I would like to monitor fuel trims from the laptop as I am getting a flat spot in the mid rev range and am sure its going lean not just on gas but petrol also just more pronounced on gas if you could tell me the pin numbers it would be great so I can have a look what's happening.

I used to have pinout notes on my laptop but that was on the old laptop which broke... getting to know them again will involve either my scouring around in the garage to look for a bit of paper sent by a supplier years ago, or making my own pinout diagram from looking at a loom I have here, but I'm a bit busy to do either at the moment and will be on holiday soon as long as I get all my jobs done!

I'll come back with pinout at some point but it might not be for a while. Still, you'd be better off using an OBD2 live data scanner than connecting the OBD wires of the LPG ECU - The sample rate of the LPG ECU is a bit slow for purpose of using as a calibration aid / If you were to use the connection for purpose for which it was designed (enabling the adaption facility) it still wouldn't make up for incorrect map shape but could cause problems at other engine loads/rpm / Don't know the year, board suffix or firmware of your ECU but it might not support the OBD connection anyway. There was only a period of maybe a year where ECU's that could support OBD connection were supplied with looms that didn't have OBD wiring already connected / On some vehicles, leaving LPG ECU OBD wiring connected can inadvertently interfere with the canbus, which can cause problems ranging from minor such as inability to connect with an OBD2 scanner to far stranger and more concerning symptoms affecting anything on the canbus, even inability to crank the engine on some Mercs. Do yourself a favour and buy a cheap OBD2 live data scanner rather than wire in the LPG system's OBD connection!

Simon

Thanks Simon I'll take your advice with regards the OBD I don't want to cause more problems. I dont suppose you would have an old AEB system calibration file from a V8 Jeep you could post a screenshot of from the map page? Just so I can get an idea of the general shape I realise my car will require fine tuning but a shape to aim for would be great

Thanks

Rick

I meant to reply, sorry.

Map depends on at least brand of injectors selected / fitted, pressure (setting and actual) and to a lesser extent brand of ECU...
Since the laptop I'm using is relatively new and my old laptops died there's a smaller chance I'll have a relevant file now than might have been a few years ago when I used the same laptop long term, but if you tell/remind me your make of system I'll have a look.

Simon