Td5 engine just run for 1 second

Hi folks.. I have a problem with a td5 engine and I can’t figure out the problem...
It’s a 2004 td5 110. the wiring loom was burning so the garage fit another but from a 10p and without abs wiring.
The car will start and run just for a second and stops like somebody turn the key.
I have tried various ecus and green boxes (all running on other defenders) try a Ecu now with Immobiliser out but nothing. I change now the engine loom and use another dash loom from 15p again without abs... still start and off.. Nanocom tells me immobiliser is in but it’s not possible for my opinion...
Is it a problem when the loom is without abs? All earth wires checked aswell... engine is running with break cleaner but stops without... no ideas anymore

HI. The ABS should not affect the engine. If you swapped ECUs and green boxes without making it learn the security code first then it's immobilised. If you have nanocom go in "Td5 engine - Utility - learn security code" then after it's confirmed it should start provided the alarm ECU(green box) is not already in immobilised status.

Yes I know I have reprogrammed it thousand times...I also used a Ecu where the chip for immobiliser is getting out so it didn’t need the green box anymore but also no luck...

then maybe the loom you've got comes from a vehicle which didnt have alarm (like those without ABS usually) so not only the ABS is missing but the security signal link too... you need a 100% compatible engine harness

Never heard about that looms... the plugs for the green box are also there. could it be something different that let it kill? Alternator
Starter something like that which is maybe faulty after that burning old loom?

You said that nanocom reports it immobilised and that's how it acts then, i dont see other reason for this behaviour so even if i dont know 100% i suspect that the main(dash) loom is missing the security link cos on some modells the green box acts only as central locking device not alatm/immobiliser and maybe the looms for those(which usually are missing the ABS too) dont have the wire for that or if you didnt work on the main loom with the black plug the security link has suffered. You can check with multimeter for continuity between C0658 - 34 and C1979 - 14 to rule that out, if no continuity make it with a wire , make it learn code again and see then. download this for pin disposals, see "connector" https://www.sugarsync.com/pf/D8700125_05791262_69829?directDownload=true# . Also did you check all the fuses ? concentrate on F7 under seat and F8 console fusebox

Thank you for that interesting link
I try to figure it out on Tuesday

I'll explain, if you can read a diagram download this too https://www.sugarsync.com/pf/D8700125_05791262_69826?directDownload=true# go to "engine management" and you can see the security link from C0658 - 34 to C1979 - 14, so it's possible that if the dash harness is from a defender which didnt have alarm this wire might be missing then the ECM doesnt get the remobilisation signal and it behaves like you described. Unfortunately the immobiliser operation is not described in the Defender's WSM but the ECU is similar with the D2's and i presume it needs the same input on C0658 - 34, read ''10AS ECU" instead of BCU in this description which is from the D2 WSM:
(the red part is the most important so if you dont have continuity on that link that can be your problem... or if there is continuity then it's one of the first two cases then cut the wire and see what happens)

Immobilisation system

When the starter switch is turned on, the BCU sends a unique security code to the ECM. The ECM must accept this
code before it will allow the engine to operate. If the ECM receives no security code or the ECM receives the incorrect
security code, then the ECM allows the engine to run for 0.5 seconds only. During this operation all other ECM
functions remain as normal.

The ECM operates immobilisation in three states:
l 'New.'
l 'Secure'.
l 'No Code'.
When an ECM is unconfigured it will operate in the 'New' state. When an unconfigured ECM is installed the engine
can be started and operated once only, then the ECM has to be re-configured to either 'secure' or 'no code'
configuration depending on whether a security system is fitted to the vehicle. This is achieved by using TestBook.

With the ECM in a 'Secure' state, it will not function unless an alarm system is fitted to the vehicle. A 'Secure' ECM
cannot be configured into a 'No Code' ECM.
With the ECM in a 'No Code' state, it does not require an alarm system to be fitted to allow the engine to operate. If
the ECM senses that an alarm system is fitted it will not start. A 'No Code' ECM can be configured to a 'Secure' ECM
using TestBook. A 'Secure' ECM can not be configured to a 'No Code' state.

If a vehicle stalls immediately after starting it is possible that it has been immobilised. This means either:
- The ECM was configured as 'No Code' but the ECM is receiving a code at its alarm input pin.
- The ECM received an incorrect code.
- The ECM was expecting a security code but did not receive one at its alarm input pin.