Land Rover Defender TD5 ECU repair

**PsiDOC** · 18th February, 2020, 07:58 PM

Originally Posted by georgedigital

The same on the bench...I checked pin to pin everything on board and its ok.The power ok and the ecu is dead in the water as PsiDOC say...

Oh no..

Ok backtrack your steps. A non boot condition can happen if either the 8pin eeprom or the 44 pin eeprom has a bad solder joint.
If that's all you have done have a good look in those areas.

**georgedigital** · 19th February, 2020, 08:54 AM

I think it's not so easy my friend.By the way i will check.Thank u!

**tango** · 20th February, 2020, 11:44 PM

are you sure you soldered the plcc and eeprom the correct way ?
easy to put pin 1 in wrong place

**PsiDOC** · 21st February, 2020, 10:28 AM

Originally Posted by georgedigital

I think it's not so easy my friend.By the way i will check.Thank u!

Anytime. If you're prepared to work with it I am still here to help.

For your reference, Attached is the correct orientation of the 27C1024 eprom.
As Tango says, it's easy to get it 90 or 180 degrees out.
As you can see the flat corner of the eprom used for orientation goes closest to the processor and towards the edge of the ecu.
HTH.
Si

**georgedigital** · 21st February, 2020, 12:04 PM

i do it right and i checked many times.After all i have 2 ecus to compare...and for confirmation i attach a foto

**tango** · 21st February, 2020, 03:25 PM

recheck this area it dosnt look right

**georgedigital** · 21st February, 2020, 03:41 PM

to the 8pin eeprom in this area is 5 and 8 pin with 5vdc and its ok pin 6,7 not connected.To 44plcc i have check all pins one by one.I will put a socket so i can put and take out the flash and experiment.I think that is software problem

**tango** · 22nd February, 2020, 03:25 PM

software as in the flash on the plcc44 ?
if so how? you have 2 plcc44's one with 171 sw and other 191sw these i cant see getting corupt
the plc44's are OTP
are you in the uk ? if so what area ?

**georgedigital** · 22nd February, 2020, 04:38 PM

I can't find another explanation. The problem started when I tried immo off.I try each flash with the corresponding eeprom with original file and the ecu does not boot.I've checked all the joints and it's ok.I read the flashes and eeproms regularly. I haven't burned them since warming up.What else can it be to blame?Is the processor?

**georgedigital** · 22nd February, 2020, 04:51 PM

i can't read mc68336.Galleto can read mems3 only NNN ecus with 29f400

**tango** · 22nd February, 2020, 06:04 PM

the only eeprom you need to use is the original eeprom from the original ecu for the defender you are try it on
the eeprom from new ecu you should put to one side and leave it there