Thread: Defender TD5 Ecu

Yes, but injector codes will need to be reprogrammed. Apparently on information from an old AULRO friend that no longer frequents, it is better to keep the original type ECU. Ar you sure it is completely dead? Could a ugrade chip fix it? Maybe worth sending to some one like TRS or TRT to take a look at.
Cheers
Craig

well after i had "check engine" come up and lost gas peddal couple of times, and no one realy knows whats the problem, i want to change the Ecu, and the two
harness's connecting it. in the red connector i have oil (not much) and seems
when touching the black one it brings up the "check engine" problem. as my car is ex-military and not in a terrific shape i rather invest in this and stop all issues.
any idea what is the black harness part number ?

The oil in the ECU is an easy fix. I bought a new injector harnes as they can be bought for around $130 but flushed the main harness as this is significantly more expensive and a pain to clean. Use a good contact cleaner that is non destructive. It will take time. Unplug at ecu and at head.I did mine overnight making a small container around the plug female side into the main harness and let capillary action occur. Keep checking for oil and residue over the next couple of weeks. Mine has been good since. It is the o rings that wear out. I have since cleaned the old one as well and keep as a spare.
Best bet if you can find someone local with the same type ecu swap it out and take it for a run to see if it makes any difference.
I would say the oil will be the culprit as it does not take much to upset the electrical signals. The oil can not physically get into the ecu itself
Good Luck

i think to change the ecu you will have to change the throttle as the early ones were 2 point and the later ones were 3 point any they are not interchangeable

Isnt the "fly by wire" throttle quite a problem on Defenders when oil is in the harness???
You are up for the injector harness(its inside the rocker cover) and possibly the fly by wire accelerator pedal if oil contaminated.
As Craig says,its not too hard to flush the oil from the main harness.
GOODLUCK
Andrew

Early ECU so 2 pot not 3 pot. If you swap the ECU's without reprogramming the injector codes you may notice some performance issues, but more importantly, swapping with out cleaning the harness won't achieve anything.

If it was me I'd be cleaning the harness as mentioned and also be checking the throttle. After this is done I'd get it to a diagnostic unit and see what else is occuring.

injector harness was changed couple of years ago. still have small amount of oil left, i dont think this is the problem.
when touching the BLACK connector on the Ecu, i get the "check engine" together with the throttle problem. either its the connector itself on the harness or the connector on the ecu side. I hope next week ill get a spare ecu for couple of days from the garage and will try to see whats going on.
maybe i will have to replace the harness of the BLACK connector. can someone help with part number of it ? cant find it.

I think you may be missing the point. Any oil in the harness/ecu connection plugs will cause issues. It needs to be clear of all oil. Any residue can cause problems as oil is actually electiclly conductive.
This is the easiest check first. If you still have oil impregnated and moving via capilliary action you will not resolve this problem and it will keep reoccuring until you either clean or replace harnesses. If it is the oil problem changing the ECU will not help. It is rare for an ecu to die like that. If it is the ECU thats not good and good luck finding another. They do come up but not often. As said if you can borrow a similar unit it may determine if it is the ECU or oil residue. Have you checked for bent pins?

Originally Posted by ISR110

injector harness was changed couple of years ago. still have small amount of oil left, i dont think this is the problem.
when touching the BLACK connector on the Ecu, i get the "check engine" together with the throttle problem. either its the connector itself on the harness or the connector on the ecu side. I hope next week ill get a spare ecu for couple of days from the garage and will try to see whats going on.
maybe i will have to replace the harness of the BLACK connector. can someone help with part number of it ? cant find it.