Driver demand problem 1

Hi guys,

Next problem - When accelerating above 50mph or increasing power on a hill I get a shudder and a loss of power, the vehicle drives fine under 50mph (50mph is not an exact speed when the fault appears but a approximate speed).
I have new fuel pump and lines fitted, wategate is free, New MAF & MAP sensors fitted.
Nanocom says Driver demand problem 1 is that the accelerator pedometer?
Does this sound like my fault?

Defender td5 110 2003

Google would suggest it's the pedal or loom between pedal and ecu.
You would be able to read the live data from the pedal with Nanacom I would have thought.

Anaconda said:

Google would suggest it's the pedal or loom between pedal and ecu.
You would be able to read the live data from the pedal with Nanacom I would have thought.

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If its the loom would it mean damaged wires?

pjh1968 said:

Hi guys,

Next problem - When accelerating above 50mph or increasing power on a hill I get a shudder and a loss of power, the vehicle drives fine under 50mph (50mph is not an exact speed when the fault appears but a approximate speed).
I have new fuel pump and lines fitted, wategate is free, New MAF & MAP sensors fitted.
Nanocom says Driver demand problem 1 is that the accelerator pedometer?
Does this sound like my fault?

Defender td5 110 2003

Click to expand...

I had the exact same problem and same error code on my disco 2 td5. I only found the problem by accident - a split in one of the hoses under the airbox. Skinny little hose - think it was a vacumn line but can't remember now. Cut 10mm off it, reattached, problem gone. Cheapest fix ever.

k2sul said:

I had the exact same problem and same error code on my disco 2 td5. I only found the problem by accident - a split in one of the hoses under the airbox. Skinny little hose - think it was a vacumn line but can't remember now. Cut 10mm off it, reattached, problem gone. Cheapest fix ever.

Click to expand...

Mine is the defender 110 I think there are many variations to the D2 despite both being TD5 engines.
Worth a shot though - dix you have to remove the airbox?

Thanks

Yes, the wiring on these things does deteriorate between the accelerator ('driver demand') pedal and the ECU. I'm not the only one to have had this happen. You can look at the input from the pedal on the Nanocom and see the voltages changing as you press the pedal down.

Do you get the same problem at the same revs if you rev the engine with the vehicle standing still? Or only when moving?

Brown said:

Yes, the wiring on these things does deteriorate between the accelerator ('driver demand') pedal and the ECU. I'm not the only one to have had this happen. You can look at the input from the pedal on the Nanocom and see the voltages changing as you press the pedal down.

Do you get the same problem at the same revs if you rev the engine with the vehicle standing still? Or only when moving?

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Only when moving, mainly when I need more power.

Thanks

pjh1968 said:

Mine is the defender 110 I think there are many variations to the D2 despite both being TD5 engines.
Worth a shot though - dix you have to remove the airbox?

Thanks

Click to expand...

Went and had a look. Airbox didn't 'need' to come out to fix it, but I only noticed the split becuase the box was out, if that makes sense. The pipe in question terminated on top of the intercooler to turbo hose. The hose that had split was about 10mm in diameter and approx 200mm long, the other end connected to a sensor, although I'm not sure what this was - MAP perhaps.

Like yourself, issue only appeared at certain speed, when under load going uphill. Guessing the pressure inside the intercooler pipe overcame the resistance of the split pipe , and caused the sensor to error report.

OK did some testing today.

Plugged in the nanocom went to the Accelerator page which had 4 boxes Accel 1, Accel 2, Accel 3, Accel voltage.

I'm guessing this is the 3 track type??

Anyhow turned ignition to on - slowly pressed the accelerator and Accel 1 went from 0.857 up to 4.87 not sure of the exact figures or what Accel 2 and 3 are measuring? Voltage feed was over 5 volts.

Went for a drive different story, Accel 1 didn't want to go over 3.2 volts and dropped voltage when accelerating got back home turned of the engine slowly pressed the pedal and it stopped at 3.2 volts. Turned off the vehicle reset everything turned back on slowly pressed the pedal and Accel 1 went upto 4.87 volts?

Looking at the pedal is there a cover missing?

I inspected the the wires the best I could but I saw nothing obvious the wires then disappear into the loom.

I'm still thinking I need a replacement but getting this part looks difficult it seems to be on back order everywhere.

I'm thinking of a second hand part for now does anyone know where I can get this part.

Landrover defender 110 2003 td5 is my vehicle.

Thanks hope this all makes sense

For some tests you can follow.
New pedals are quite expensive, think you can buy a pre-made loom if needed.
Let's us know how you get on

pjh1968 said:

slowly pressed the accelerator and Accel 1 went from 0.857 up to 4.87 not sure of the exact figures or what Accel 2 and 3 are measuring? Voltage feed was over 5 volts.

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Accel 1 + Accel 2 should add up to the supply voltage give or take 10%. IIRC Accel 3 should be close to Accel 2.

jamesDiscoTD5 said:

Accel 1 + Accel 2 should add up to the supply voltage give or take 10%. IIRC Accel 3 should be close to Accel 2.

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OK thanks guys,
I think a new overlay harness is my next step explained very nicely in the link.

pjh1968 said:

OK thanks guys,
I think a new overlay harness is my next step explained very nicely in the link.

Fix a Td5 throttle pedal

Has your accelerator stopped accelerating? Martin explains the cure with an overlay wiring harness

www.landrovermonthly.co.uk

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I had your symptoms in my td5 90. Felt like it was hitting fuel cut. Then it started dying when it rained ! You couldn’t buy an overlay harness at the time - I made mine out of trailer cable and it cured it totally. I’d do it as a matter of course on a td5 if I had one now just to tuck the wiring for accelerator into the cab. I think the accelerator wiring takes some stupid route around the gearbox…

Have you got it sorted?