DEFENDER2.NET - View topic - Annoying Fault i cant Diagnose

↓ Advertise on Defender2 ↓

Home · FAQ · New Posts · My Posts · PMs · Search · Members · Map · Calendar · Profile · Donate · Register · Log In

Home > Td5 > Annoying Fault i cant Diagnose

Page 2 of 2

Print this entire topic ·

robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

Hi Pete,

So problem happens when the pedal is pushed to the floor. Doesn't matter if your in low/high, stationary or moving, on boost or off boost.

What happens is the throttle response changes. It goes into what the throttle feels like when your on low range, EG extended throttle range, so you have to push the throttle down further to get the same power out as if you were in normal throttle mode (EG as if you were in high range).

So if your driving it and it's all fine, usually little throttle push to maintain a road speed. If you press the throttle to the floor, straight after, the feel of the throttle response has changed and you have to push it further to get the same response as before you pressed it to the floor.

I don't think it's related to boost, as it happens as I said at the start of the message without any load on the engine. The only time it happens is when the pedal goes to the floor, even if it's for only a mili second (as fast as it can be pressed and release) during this time, the engine revs hardly move, but it causes the problem.

I do think it's electrical in some way, either pedal or wiring. Where about does it chafe in the loom? Could I check this?? Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

9th Dec 2011 5:07pm

robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

any onr got any further ideas on this??

I will visually inspect the pedal etc. Is it possible to check where the wires chafe?? Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

17th Dec 2011 10:21pm

Zeus

Member Since: 14 Dec 2011
Location: Dumfriesshire, UK
Posts: 10

It sounds to me like perhaps the throttle pedal is being re-calibrated by the ecu if it has been fully depressed.

I guess in an ideal world, no throttle depression - 0% and full depression = 100% but what if the ecu sees readings for 110%, it may trigger it to re-calibrate it's range.

once triggered, does the truck have less power, or is it all still there but just feels different?

I would get it connected to a Nanocom or similar. The throttle actually has 3 potentiometers that all need to be working.

Sadly you are nowhere near me but someone may have one close to you.

Zeus 2004 110 XS SW

18th Dec 2011 2:28am

robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

Zeus wrote:

once triggered, does the truck have less power, or is it all still there but just feels different?

I would get it connected to a Nanocom or similar. The throttle actually has 3 potentiometers that all need to be working.

Sadly you are nowhere near me but someone may have one close to you.

Zeus

Thnaks for the info. The truck has the same power once you press the throttle to the floor, but you just have to press it further than normal to get the same power as you would have before the error occurs.

When my local garage plugged it in, it was reading no faults, so dont think a nanocom would help would it?

I guess i have to bite the bullet and buy a new pedal assembly and hope its that?? If its not, it will be over £100 down the toilet... Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

18th Dec 2011 1:34pm

robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

Does anyone know if all the 15p engine Td5 defenders use the 3 pin Accelerator assembly's?

I am thinking of changing mine as a punt on the problem described earlier in the thread. Been offered one which is from a 15p engine defender, but just want to make sure it will fit before I get it.

It's a used one, but it's been tested and is working properly, so should help me find the problem, or rule something out.... Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

18th Jan 2012 9:14pm

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

You need to check the part number on the throttle unit to see if it is a 2 pot or the later 3 pot. The engine ECU needs to be told which one is on the vehicle, but even the later engined units have the 2 pot units on them. I programmed a new unit up this morning on T4 and the T4 software (which has not been revamped by Omitec for a while now) shows the part number for the 3 pot as being SLC000010PMA, although the later number after this is LR031386 which should still be 3 pot.

You need to find someone with Testbook/T4 so that they can see what the live data is saying when it starts happening. T4 will show if the throttle unit is working on live data because both the 2 shown voltages should be adding up to around 5v as the pedal is depressed - One voltage rises while the other falls.

18th Jan 2012 9:54pm

robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

So if its a 3 pin one, could i replace with a 3 pin one without any retuning or reprogramming.

Have you read my problem im having from the start of the post. Its really peeing em off, hence trying to find the problem.

When my local indie checked the pedal, he said it was ok though, but not sure how it came up.

The pedal works fine, but as soon as its pressed to the floor, it engages the offroad throttle mode, and doesnt change back to normal until you swtich off the car. No fault is logged, as i guess the car doesnt see it as a fault.

I think i need to take it to a specialist LR electrics person...

F**K me.......... Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

19th Jan 2012 4:58pm

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

You need to find someone who has the kit, otherwise you will end up spending more blindly changing parts 'till something fixes it.

Just find someone with T4, or similar dealer level system. They shouldn't charge the earth.

19th Jan 2012 6:12pm

Page 2 of 2

All times are GMT

Jump to

< Previous Topic | Next Topic >

Posting Rules

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum