neonovice Posted July 5, 2012 Share Posted July 5, 2012 I am having real issues with the ECU on a '03 TD5 defender. It started with a hose out of the vehicle interior, after which the engine would fire but would not rev. I replaced the pedal and TPS thinking it must be that, but alas, no. I think I have narrowed it down to the ECU. It is the NNN000120 ECU that is fitted. I tried one from another '03 TD5 defender which was NNN50020 but it won't even start with that one on. Where do I get a suitable replacement ECU? What part number ECU do I need? Should I just be able to plug it in and go or do I need some kind of diagnostics machine? Please help as I am totally stuck. Quote Link to comment Share on other sites More sharing options...
landroversforever Posted July 5, 2012 Share Posted July 5, 2012 you need the 10AS Alarm unit to be able to communicate with the ECU, so just plugging in a new one won't work without plugging the car into some diagnostics. Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 5, 2012 Author Share Posted July 5, 2012 I don't think the defender is fitted with an alarm, does that matter? Quote Link to comment Share on other sites More sharing options...
RangeyRover Posted July 5, 2012 Share Posted July 5, 2012 Dad had the same symptoms on his 02 TD5 discovery. Turned out to be a collapsed catalyst in the exhaust, the engine couldn't breathe. Maybe check that you don't have a similar problem? Quote Link to comment Share on other sites More sharing options...
101sean Posted July 5, 2012 Share Posted July 5, 2012 It's unlikely to be the ecu and you can't just swap them around anyway without programming them to the alarm, injectors etc. Yours will almost certainly have an alarm/immoboliser, very unusual to find a home market one without. You really need to get it plugged in and faults and live readings taken to see what the problems are or you are just throwing bits at it blindly. Quote Link to comment Share on other sites More sharing options...
stuck Posted July 5, 2012 Share Posted July 5, 2012 I agree that you need to get it hooked up to something then you can see what's happening. My 2000 110 (farm spec) doesn't have an alarm or immobiliser so it can't be too unusual. Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 6, 2012 Author Share Posted July 6, 2012 Has anyone tried an android OBD2 app ? You plug in one of these then you can apparently diagnose your vehicle through your phone. Quote Link to comment Share on other sites More sharing options...
dirtyninety Posted July 6, 2012 Share Posted July 6, 2012 I have one of those bluetooth OBD2 adapters... never tried it with my android phone tho. I know i couldnt get it to work with my old nokia no matter what i tried. EDIT: just installed it on my phone, going out to try it... EDIT2: Cant get it to work with the cheap ebay elm-327 adapters, It will connect, but no values from the ECU are present. Shall have to try a more expensive obd2 adapter. Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 6, 2012 Author Share Posted July 6, 2012 I have one of those bluetooth OBD2 adapters... never tried it with my android phone tho. I know i couldnt get it to work with my old nokia no matter what i tried. EDIT: just installed it on my phone, going out to try it... You need to go to the play store on your phone and download the app! The pro version is £5 but you can try it free first. Quote Link to comment Share on other sites More sharing options...
UdderlyOffroad Posted July 6, 2012 Share Posted July 6, 2012 I am not a Td5 owner but I'm fairly sure you won't be able to reprogram the ECU by use of the OBD socket. Even if you don't need to reprgoram it, you'll probably not be able to clear the fault codes Ask your local independent Landie specialist to drive to your place (possibly on his way home as a 'cash' job ;-) with his diagnostic machine (Nanocom/Hawkeye etc). Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 6, 2012 Author Share Posted July 6, 2012 I am not a Td5 owner but I'm fairly sure you won't be able to reprogram the ECU by use of the OBD socket. Even if you don't need to reprgoram it, you'll probably not be able to clear the fault codes Ask your local independent Landie specialist to drive to your place (possibly on his way home as a 'cash' job ;-) with his diagnostic machine (Nanocom/Hawkeye etc). Already thought of that, first port of call really. Trouble is he is closed for a fortnight. Dont want to clear the codes or reprogramme, just want to know the problem. Quote Link to comment Share on other sites More sharing options...
UdderlyOffroad Posted July 6, 2012 Share Posted July 6, 2012 Dont want to clear the codes or reprogramme, just want to know the problem. It started with a hose out of the vehicle interior, after which the engine would fire but would not rev. Sounds to me like the engine is in 'limp home' mode, in which case you will need to clear the fault codes before it will work properly. Most likely cause - the water shorted out some contacts, giving odd readings, so the ECU put the engine into limp home mode in order to protect the engine, and logged some faults. It now won't allow the engine to be taken out of limp until these faults are cleared. As you've proven, cutting the power will not clear the codes. Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 6, 2012 Author Share Posted July 6, 2012 Sounds to me like the engine is in 'limp home' mode, in which case you will need to clear the fault codes before it will work properly. I don't think it's in limp mode. The Landy can't limp anywhere. Dip the clutch and accelerate and the engine dies. Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 6, 2012 Author Share Posted July 6, 2012 I have one of those bluetooth OBD2 adapters... never tried it with my android phone tho. I know i couldnt get it to work with my old nokia no matter what i tried. EDIT: just installed it on my phone, going out to try it... EDIT2: Cant get it to work with the cheap ebay elm-327 adapters, It will connect, but no values from the ECU are present. Shall have to try a more expensive obd2 adapter. Which software are you trying to use? Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 9, 2012 Author Share Posted July 9, 2012 After contacting the developer of the android software it would seem that as the Defender is 03 and not 04 it is not OBDII compliant. I think I'll get a nanocom and try that. As far as the Defender goes I think it might be the switch on the clutch master cylinder that's the problem. If I depress the clutch the check engine light lights up and the throttle pedal becomes unresponsive. Only £20 odd from John Craddocks so worth a try. Quote Link to comment Share on other sites More sharing options...
Porny Posted July 9, 2012 Share Posted July 9, 2012 A common misconception... All Td5 Defenders have an alarm unit - a 10AS unit - a green box screwed the bulkhead behind the clocks/instruments. In it's most basic form - the Engine ECU will ping the 10AS unit for a code, if this code is what the engine ECU expects to see (matched pair), it allows the engine to start. The 10AS can be programmed to different levels from the most basic poverty spec to full XS. There are predomintly two types of 10AS - central locking and none central locking.... both can be set from poverty spec upwards. Swapping Engine ECUs - as mentioned the engine ECU and the alarm 10AS unit needs to be matched together, so if you just swap the engine ECU - they are no longer matched, and the ECU will not start. Really you also need to make sure you have the correct ECU calibration on the ECU, and the injector codes are swapped over from your old engine ECU. Was the throttle pedal you used as the replacement new or second hand? Is it the correct post 2002 3 track pedal, or have you fitted an earlier 2 track pedal? - as if you've fitted the wrong type, it will not rev - the ECU needs to know if its a two track or three track. The NNN500020 is fine to use on your Defender, with the correct files - but will need to be matched to your alarm ECU - I can do this via the post if needed... or I can remove the need for a 10AS unit completely, giving you a plug and play ECU - probably not needed for your application. Ian Quote Link to comment Share on other sites More sharing options...
neonovice Posted July 27, 2012 Author Share Posted July 27, 2012 Many thanks for the help and advice! I turns out it was a burned out relay. £8.00 fix As for the OBD thingmy, I have bought a HawkEye diagnostic tool. I have not used it yet as I figured out the problem before it arrived. Looks like a handy thing to have though.... Anyhoot, thanks again for all the advice. Quote Link to comment Share on other sites More sharing options...
landy andy. Posted December 21, 2012 Share Posted December 21, 2012 What relay was it? Where does this relay live? Part number? How did you diagnose? May be my problem, and well worth checking Thanks Andy Quote Link to comment Share on other sites More sharing options...
neonovice Posted December 21, 2012 Author Share Posted December 21, 2012 It was a yellow one in beside the ecu, if I remember right it's a ford one. You could see where it burned out on the wall of the relay. Quote Link to comment Share on other sites More sharing options...
neonovice Posted December 21, 2012 Author Share Posted December 21, 2012 FORD RELAY G1UHD 93BG 14N089 B1B V23136-B1-X33 40A Quote Link to comment Share on other sites More sharing options...
neonovice Posted December 21, 2012 Author Share Posted December 21, 2012 http://www.ebay.co.uk/itm/Fuse-and-Relay-pack-Ford-cars-/330589770783 Quote Link to comment Share on other sites More sharing options...
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