Potentiometer.

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I also cleared fault 3.7 AIRFLOW CIRCUIT LOGGED HIGH, which means what?

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I think it means that the MAF is reading high. Once they read high the ECU considers the value to be zero. I am only familiar with Nanocom errors .

This causes a big miss at high revs and high load in an EU3.

To me the accelerator potentiometer looks OK, but usually potentiometer problems are intermittent when wear causes a break in the carbon track, and as the potentiometer crosses the break problems occur. I don't know if this applies to the TD5 as the sum of the two may be used by the ECU to compensate.

Regards PhilipA
Another common problem is that the wiring loom from accelerator to ECU gets a short.

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Originally Posted by sierrafery

Hi, important readings are accel way 1 and 2, a well working TPS should do way 1 around 0.6V at idle(+/- 0.2), way 2 = supply(around 5V) - way 1 and as you push the throttle way 1 increases and way 2 decreases by maintaining the sum way 1 + 2 = supply. Way 3 is for fine tuning and it has no standard path but closer to way 2 most of the time

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Your readings are fine...i quoted myself and edited the way 1 value in the text but i couldn't edit the original post of mine... so my apologies, i had a mental hickup when i wrote 1.6(wrong) at idle cos the correct value is 0.6(+/- 0.2)V Sorry

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Originally Posted by V8Ian

I also cleared fault 3.7 AIRFLOW CIRCUIT LOGGED HIGH, which means what?

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means that the MAF sensor is fubar IF it's genuine but if it's some aftermarket the reading can be erratic.... or there is a boost leak or turbo wear as the sucction of the turbo through the intake is high while the boost which is reaching the manifold is too low for that air flow, i attach a list of correct readings which is a result of 10 years of study and various drive tests with diagnostic tools connected, i made it few years ago so the accel way there is a bit higher but still within the 0.6 +/- 0.2 range v [bigsad]

Out of curiosity, what should Track 3 read on a 2 Way Pot, EU2?

Cheers,
Matt.

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Originally Posted by smOke

Out of curiosity, what should Track 3 read on a 2 Way Pot, EU2?

Cheers,
Matt.

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Zero

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Originally Posted by sierrafery

Zero

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Interesting. Perhaps I should start a new thread.

I have been chasing a poor performance issue for 18 months.
Another forum member kindly helped me out for several months with constant back and forth emails.
We managed to iron out some of the bugs but the Td5 is still not right.

Sometimes it runs very poorly, most of the time it runs "ok" and a small percentage of the time it runs like a cut snake.
I get readings on Acel Way 3 which appear to be all over the shop. It's an EU2 engine with an MSB ECU (Stage 2 Alive map) and 2 Way Pot (set to 2 Way in Nanocom). I even installed a different one to see if that was the issue but it made no difference.
We came to some kind of conclusion that perhaps there is a bad earth somewhere in the loom or the throttle wires between pedal and ECU may be chaffed and shorting.
An live data log example attached.

Any thoughts would be appreciated. I can start a new thread if required.

Cheers,

Matt.

It's some glitch IMO cos i checked other 3 different Eu2 nanocom logs and there are sporadic readings on way 3 in all... I can't find an explanation, see an old log of mine with dead MAF

Do you mean glitch in the loom or in Nanocom?

If you look at my Accel. Way 3 in descending order you'll notice some rather high values.
Aren't these out of normal range?

It's a nanocom or some ECU glitch which seems common... way 3 can't be higher than the supply whatsoever(actualy none of them can)