Disabled accelerator pedal TD5 110

[Dusty25]

Hi All,

My accelerater pedal has become disabled on a number of occasions, the engine symbol on the dash lights up but the engine remains running and will accelerate at approx 5mph with the engine at idle revs. This has happened on a number of occasions and always in the wet, after the truck is left sit for a couple of hours its fine again. Has anyone else come accross this problem? Is there some control/electricla box under the chassie which could get wet and maybe the cause of this problem? I would very much appreciate any feedback,

Thanks

Tony

[Happyoldgit]

Moved to the Defender section.

[landy andy.]

The pedal is directly wired to the ECU under the seat, this could be getting wet, but this is unlikely. The normal reason for this to happen in my experience is cables rubbing through each other in the wiring loom from ECU to pedal assembly, then shorting whilst wet. This normaly occurs where the loom goes over then along side the transfer box. You can just run a new cable and rewire direct from ECU to pedal assembly.

Andy

[Dusty25]

Thanks Andy I will have a look at the box and see if it is getting wet and also check the wiring. Thanks again.

Tony

[Tanuki]

The TD5 throttle-pedal contains two potnetiometers wired in anti-phase; as the pedal is pressed the output from one potentiometer goes from low-to-high voltage while the output from the other goes from high-to-low voltage.

If the potentiometer-tracks get worn/dirty or something in the wiring causes a voltage 'leak' then the ECU does not see the correct relationship between the rising- and falling-voltages as the pedal is operated - it then shuts down the throttle-pedal as an input and flashes the lights.

First thing I'd do is check for dirt/mud around the pedal: there is a metal shield for the terminals where the loom is attached to the pedal but muddy/snowy boots or a prolonged water-leak from the bulkhead/windscreen seal (conveniently placed immediately above the throttle pedal) can cause conductive bridging of the connections.

[Andy730]

Hi, sorry for butting in on this thread, but i've been searching for more info on a problem of my own. I think i have traced it down to a worn or dirty potentiometer, but can't be sure. I'd like to do a simple resistance test on it as my next check. Would you happen to know what the resistance of this dual potentiometer should be by any chance???