Hello,
Hopefully one of you can help me out. I have 55 plate TD5 90 defender which is jolly nice but I’ve got an issue with the throttle and the ecu (not un-common)
On 10 occasions in perhaps 3 months as I come to a halt the engine ecu light comes and the engine continues running but the throttle has no effect, the engines not in a limp mode it’s literally at tick over.
9 out of 10 times if I turn the ignition off and then on again the problem clears and 1 out of 10 times I need to leave the ignition off for 30 seconds to clear the fault.
If I hang my Hawkeye on the Defender the item of interest is ‘Fault 3141 Driver Demand has been faulty’, I can reset the fault and then next time it occurs the 3141 message pops back up again.
If I hang the Hawkeye on the working Defender and put it into live mode I get the following readings
With my foot off the peddle
17 – Driver Demand 1 = 0.60v
18 – Driver Demand 2 = 4.47v
19 – Driver Demand sup = 0.00v
With my foot flat to the floor
17 – Driver Demand 1 = 4.69v
18 – Driver Demand 2 = 0.45v
19 – Driver Demand sup = 10.00v
If I then drive around until I get the issue and then do the same tests again the one that’s changed is that the ‘19 – Driver Demand sup’ is on 0v all the time regardless of throttle peddle position but Demand 1 & 2 give the expected readings, turn the ignition on and off and the values come back to normal.
My vin number is 5Axxxxxx and since it’s a 2006/7 Defender I believe I have a 3 track throttle peddle which is wired to the ecu as in the attached image.
So my thinking is that I’ve got a duff cable between the ecu and the throttle or a duff throttle or a duff ecu or rubbish in the connectors at the throttle of the ecu end of the loom
My problem at the moment is I don’t understand just how the throttle peddle generates these numbers.
Is the ‘Demand sup’ a calculated number inside the ecu or is it connected with the 3rd track on the throttle, if this were the case I can hang a multimeter on the correct wire (if I know how it worked) on the throttle peddle connector and work out if it’s the peddle, the ecu or the wiring.
https://forums.lr4x4.com/topic/85126-td5-driver-demand-faults/?tab=comments#comment-730530
gives a good clue and it looks like it’s from the peddle thats producing three output voltages
Can anybody help me understand just how the 7 connection’s in the throttle peddle are used by the ecu to generate these three numbers ?
I’ve read and digested this post from ten years ago which is certainly running along the same line as my predicament
https://forums.lr4x4.com/topic/9628-td5-throttle/
but the first posts mentions the pins on the peddle connector and kinds suggests that the Driver Demand sup is on pin ‘C’
and I’m also up for any suggestions regarding experiences of this nature !
Thanks for taking the time to read my ramblings and hopefully somebody has something to say about them
Cheers
Martin
TD5 Defender in Hertfordshire
