DEFENDER2.NET - View topic - ECU memory TD5. Fact or fiction?

↓ Advertise on Defender2 ↓

Home · FAQ · New Posts · My Posts · PMs · Search · Members · Map · Calendar · Profile · Donate · Register · Log In

Home > Td5 > ECU memory TD5. Fact or fiction?

Page 1 of 1

Print this entire topic ·

MC84

Member Since: 22 May 2016
Location: Near Bristol
Posts: 358

ECU memory TD5. Fact or fiction?

I was told when a car's ECU is disconnected from the battery and then reconnected (after a repair for instance) it could take a few hundred miles for the ECU to re-learn.

Is this bobbins or fact and if fact does the same apply to my TD5 2001? Mike

Hard Top 90 TD5 2001
Ford 100e 1959
www.youtube.com/mikemakesit

24th Jun 2016 6:04pm

davew

Member Since: 02 Jan 2012
Location: North Yorkshire
Posts: 888

1990 Defender 90 V8 Petrol PU Auto Rioja Red

I don't think that's the case with a TD5 ECU, some of the engine ECUs (like the later V8 petrol ones) have adaptive values that allows the ECU to learn your normal driving styles and adjust itself to give the best fuelling and ignition. They can take a few hundred miles to adapt but as far as I remember they don't reset after a battery disconnection, only after you use Textbook to tell it to reset. http://www.yorkshireoffroadclub.net/

24th Jun 2016 6:19pm

MC84

Member Since: 22 May 2016
Location: Near Bristol
Posts: 358

Thanks for the info, much appreciated. Mike

Hard Top 90 TD5 2001
Ford 100e 1959
www.youtube.com/mikemakesit

24th Jun 2016 6:29pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Not sure about the Td5 but the Puma ECU certainly learns as it lives. It doesn't however forget what it's learned if powered down.

For example, on a new ECU it will learn the fuel pump calibration autonomously and fairly quickly. If you were to change the VCV and not carry out a forced relearn with a diagnostic/programming, it will eventually recalibrate itself anyway. It will do this much, much quicker on a low mileage vehicle than a high mileage one.

You can establish this behaviour if you change the VCV and don't (or can't) recalibrate. If you keep clearing the resultant "pump relearn not performed" DTC it will eventually stop coming back, but this will happen quicker the lower the mileage of the vehicle.

It's all a bit mysterious and only the people who coded it probably really know how it works.

24th Jun 2016 7:13pm

MC84

Member Since: 22 May 2016
Location: Near Bristol
Posts: 358

Thanks Gents Mike

Hard Top 90 TD5 2001
Ford 100e 1959
www.youtube.com/mikemakesit

26th Jun 2016 7:56am

Page 1 of 1

All times are GMT

Jump to

< Previous Topic | Next Topic >

Posting Rules

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum