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lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2238

I still think that the ECU has some sort of “low range map” as the launch info for the TD5 stated “when low range is selected for off road work, a slower response duplicates the feel of a long travel pedal, and enables the driver to gain more sensitive control”

Which is exactly how it feels. So l guess there must be some software error that’s switching it into this mode when you give it full throttle in high range.

The question is, can anything be done about it?

27th Feb 2019 9:00pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784

Is it worth having the ECU remapped with a standard tune? 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

27th Feb 2019 9:01pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2238

That’s been done. The remap works well but it still defaults into the softer response if you floor it.

It seems to be pedal position, rather than actual engine power. So you can use all the power and as long as you don’t press the pedal right down it stays in the more responsive mode.

27th Feb 2019 9:23pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784

The only things left to try, then, are pedal to ECU loom or the ECU itself

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

27th Feb 2019 9:30pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5417

2006 Defender 110 Td5 USW Zermatt Silver

I assume you can rewrite a low range map?

If you can, could you just copy the high range onto low. Tha way it wouldn’t matter if it changed high to low?

Just a thought.

27th Feb 2019 9:50pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2238

Well yes that’s a thought, although then you would still have the high range map when you were actually operating in low range, not ideal, particularly with a remap.

27th Feb 2019 10:25pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2069

Have you tried unplugged the maf?

As said there is no high and low map. Just adjusts the throttle response but that can be adjusted via mapping as well.

This sounds more like overboost, ideally you need to plug in diagnostic.to see what is happening and why.

My guess would be the ECU is reading too much air and cutting the fuel temporarily. This can happen without showing an EML Instagram @defender_ventures
Empire Tuning - Agent

28th Feb 2019 6:43am

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2238

Ah l finally understand

No “low range map” just a change in the way the pedal operates.

28th Feb 2019 9:28am

achuakh

Member Since: 12 Apr 2012
Location: Singapore
Posts: 157

the easiest way to find out if this is really the issue is to put a stock map back onto the ECU and try it.

Assuming you still can read what's written on the sticker on the ECU, you can get hold of that same map and load it on the ECU and then do the test.

or you can borrow a known good working ECU and make it learn the security code from your 10AS (or it won't start) and give that a try. remember that you will need to make that borrowed ECU relearn the security code of the original vehicle after that.

however, if the ECU was not original, then something must have been messed up. From the land of the most expensive land rover defenders on planet earth. At �125k for a XS 110 csw and you get to own it only for 10yrs! Please find me a good reason to stay on this island.

1st Mar 2019 3:15am

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2238

I had the ECU reset at Land Rover and it made no difference. Our 2006 TD5 90 did it too, software issue if you ask me.

I’ve done 100,000 miles in the two Defenders with this “fault” and pretty much resigned myself to never sorting it.

Bring back my 1988 300TDi !!

2nd Mar 2019 7:33pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4395

lightning wrote:
Good thought, l had the same idea, but l’ve put a brand new pedal assembly on and it made no difference!

How frustrating.

So you have swapped the pedal, have you checked over the wiring from the pedal to the ECU - Loose connection or possibly intermittent break in a wire?

I have a reoccurring driver demand fault (3/5) on my TD5, literally driving me crazy so I understand entirely. Interesting that it could be an error in the map code... That I will have to explore a little more as mine has been mapped and didn't do it before the map...

3rd Mar 2019 12:15pm

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