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andylee



Member Since: 29 Jun 2016
Location: South East
Posts: 95

United Kingdom 
Throttle/Check Engine Light - Driver Demand Error
Re - 2003 TD5 90 CSW - 140000m

Right so over the Holiday period and covering a good 500+miles visiting relatives I have had the following issue on 3 occasions within a week.

Whilst steadily driving the Engine Management Light comes on and the Throttle becomes unresponsive.
I have then managed whilst on the move to turn the ignition off/on and restart the engine which cleared the fault and continued driving as normal.
On the Nanocom the fault comes up as follows
- 21,6 Problems detected with driver demand error (logged)
- 21.5 Driver Demand 2 out of range (logged)

I found some extensive previous threads on this exact issue and have read through them but just would like to raise this issue again to see what you all think might be the best way to go about the finding and solving.
It would seem the issue is with the second track of the accelerator pedometer and could be one of two issues.

- Throttle Pedometer wear and tear - Fix would be to replace the pedal assembly for £200
- Fraid wires and a short in the loom - Fix would be grazing a lot of knuckles tracing the issue or build a stand alone loom to ECU.

Firstly - can anyone help with the path of the loom from the pedal to ECU so I can follow it ? Does it go via the fuse box ? Anyone who’s taken the dash out might be able to help here, I just need some help to identify which part of the loom to chase and where any rubbing or fraying is likely to occur in and underneath the vehicle.

Secondly - has anyone fixed a similar issue by just replacing the pedal assembly alone ?
(On a previous thread this didn’t fix the issue and it turned out to wiring rubbing so Im interested to hear from anyone for whom this did work before I go and buy the pedal assembly)

Just trying to gauge if the fault is more likely to do with wiring which I really hope it isn’t or the pedal assembly and gather knowledge form the group here,

Thanks in advance
Andy
Post #935741 31st Dec 2021 10:35am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5788

2006 Defender 110 Td5 USW Zermatt Silver
I’ve replaced a few Td5 looms from ECU to pedal and this has always cured the problem. The original loom goes from the pedal, into main loom, across the bulkhead, then under passenger feet backward then across the top of G boxes. So have never got into stripping the loom looking for the issue. I’ve just replaced the loom direct with tow bar electric cable, as it has enough wires within it. I used to have a pedal assembly (potentiometer) to test first but no longer have that. Old td5’s were two track, and later ones three track, but the three track vehicles could be switch to two track if required. A nanocom will provide the readings from each track as it’s used/tested

The big difference is that the problem has always been that as soon as pedal is pressed the “driver demand” comes up and the engine warning light illuminates. So different from yours. And this may be important for you.

If anyone near you has a Td5 it would be nice to pedal swap and test. If your near Hertfordshire then I’m happy for a pedal swap/test.
Post #935753 31st Dec 2021 12:08pm
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andylee



Member Since: 29 Jun 2016
Location: South East
Posts: 95

United Kingdom 
Hi Andy thanks for your response and offer of help, much appreciated but Im back down south so a bit out of range, but very kind of you.

When you ran a new loom section did you follow the route of the original ? As it would seem possible to take a more direct route keeping inside the vehicle ?

Also is it just a direct line from throttle plug to ECU not via any fuse box ?

Im planning to have a good route around the loom cabling as finding the cause of the problem is always a good start to fixing one but not always possible with wiring.

My pedal is the later 3 track type, if I find myself in the situation where the problem as you mentioned arises instantly when pressing the pedal would switching to to a two track setting with my nanacom provide a temporary fix and keep the vehicle in use ? Im just preparing for the worst and hoping for the best.

Many thanks
A
Post #935763 31st Dec 2021 1:37pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5788

2006 Defender 110 Td5 USW Zermatt Silver
I’ve always run the new cable more direct, but still outside the vehicle. Drivers under seat to outside, up the bulkhead and in by the pedal. Doesn’t go via the fuse board.

Swapping from three track to two track would only help if the correct single track was damaged/effected. So unlikely.
Post #935825 31st Dec 2021 11:50pm
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andylee



Member Since: 29 Jun 2016
Location: South East
Posts: 95

United Kingdom 
New Pedal assembly and pentometer fitted and no problems or error codes so far, so fingers crossed thats it.
Post #937186 11th Jan 2022 9:26am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5788

2006 Defender 110 Td5 USW Zermatt Silver
Great news, and the best result.

Did you buy LR item, or copy, and how much was it.
Post #937218 11th Jan 2022 3:25pm
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andylee



Member Since: 29 Jun 2016
Location: South East
Posts: 95

United Kingdom 
I try to buy genuine wherever possible for critical items, not cheep but gives peace of mind for the long term. Heres’s the link

https://rimmerbros.com/Item--i-LR031386
Post #937494 13th Jan 2022 10:06am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5788

2006 Defender 110 Td5 USW Zermatt Silver
Agree with you completely. Just good to have it sorted Thumbs Up Thumbs Up Thumbs Up Thumbs Up
Post #937497 13th Jan 2022 10:15am
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