 | Home > Technical > 2006 TD5 defender driver demand 1 high |
 
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410  
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Hi dorsetsmith.
Good ol Driver Demand 1 fault, been chasing this one for years and still not settled on an absolute cause for it. Driver Demand (DD) faults are reputedly caused by either worn accelerator pedal tracks (track 1 in this case) or a broken wire between the pedal and the ECU. This is the first place to start fault finding, but in my experience it was not these bits of hardware at fault. What i did notice was that the DD fault started at the point of remapping and increasing boost presumably to or beyond the limit of the intake MAP sensor. The DD fault only ever occurs on heavy throttle, full boost (but not over boost), moderately to heavily laden and up hill either prolonged or steep). The interesting thing is that since I have backed off the boost the problem has ceased to happen. This leaves me to presume that there was/is an unbalance in the ECU mapping that under certain conditions a DD1 fault is triggered. My remap was not bespoke to my engine but a via mail. This may be the underlying issue. But it might not... Anyone else have more of a clue?! |
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13th Dec 2020 6:20pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
if it stop raining this week going check fuel presser at engine as top end power is down, all wiring and values to and from accelerator pedal to ecu ok so at a loss
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13th Dec 2020 6:34pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Interesting read here - https://www.defender2.net/forum/topic65395.html - Turned out to be the ECU at fault.
Defo check FPR for leaks although this tends to exhibit as failure to start the engine rather than top end problems. Not saying it can't be the FPR but unlikely in my experience. Top end problems are likely to be fuel pump (lazy or old) or possibly corrosion around the the fuel filter union seals. |
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13th Dec 2020 6:45pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
fuel pump yes the lest one filter screen at the bottom of the pump full of black gung
seen that hoping not ecu https://www.ecutesting.com/ Last edited by dorsetsmith on 14th Dec 2020 10:55am. Edited 1 time in total |
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13th Dec 2020 6:52pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
driver demand 1 foot off 0%------- 0.57 v
-----------------2 ----------------------4.48 v ---------------- sup---------------------0.00 v driver demand 1 foot down 100% ----4.96 v -----------------2 ------------------------0.42 v -----------------sup-----------------------10.00 v see up date below  Last edited by dorsetsmith on 14th Dec 2020 8:41pm. Edited 1 time in total |
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14th Dec 2020 10:00am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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I have seen that configuration of voltages before in another post/forum, if i recall they were using a hawkeye to diagnose it. I am afraid I do not recall the outcome.
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14th Dec 2020 10:33am |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
I used Hawkeye to read from ecm
have checked battery to chasse ground and transfer box too |
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14th Dec 2020 10:51am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6492 
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 Click image to enlarge 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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14th Dec 2020 10:55am |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
thank martin
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14th Dec 2020 11:08am |
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| AT1963 Member Since: 08 Jul 2020 Location: Leicestershire Posts: 148 
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Last week
defender went into limp mode and engine management light came on. No throttle. Anyway driver demand logged and ended up with new throttle. Been good ever since. |
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14th Dec 2020 12:14pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
this trouble no engine light dtc cleared no limp mode throttle working and will not stop with the liquid sun shin
at last fuel presser 3.9 bar  |
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14th Dec 2020 12:20pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Ok, so do we think there are three faults that result in a DD1 fault being logged?
1) Engine management light on, no throttle - Pedal replacement appears to fix problem 2) No Engine management light on, throttle OK, goes in to limp home, reduced boost and RPM - ECU map and boost issue 3) No engine management light on, throttle OK, track 3 Supply voltage too high (10v) - Maybe fault with dash light cluster. A place to start maybe... |
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14th Dec 2020 5:29pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
3) No engine management light on, throttle OK, track 3 Supply voltage too high (10v) - (Maybe fault with dash light cluster.
 )
2) No Engine management light on, throttle OK, goes in to limp home, reduced boost and RPM - ECU map and boost issue the wastegate stuck open now free up and working one down ( moves from close to 1/4 open at 14psi and fully open at 20 psi ) See up date post below |
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14th Dec 2020 6:05pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
Hawkeye read this from ecm
driver demand 1 foot off 0%------- 0.57 v -----------------2 ----------------------4.48 v ---------------- sup---------------------0.00 v driver demand 1 foot down 100% ----4.96 v -----------------2 ------------------------0.42 v -----------------sup-----------------------10.00 v Nanocon read this from ecm Click image to enlarge I wood seem that Hawkeye is not read from the ecm correctly thank for all input for pre 2002 two track pedal pots filmware 4Last edited by dorsetsmith on 15th Dec 2020 1:53pm. Edited 1 time in total |
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14th Dec 2020 8:46pm |
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