limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd

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Topic: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd (Read 24048 times)

nyet

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #30 on: February 24, 2014, 10:33:24 AM »

Can you post a clean 3rd gear pull?


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phila_dot

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #31 on: February 24, 2014, 12:09:28 PM »

It's not weird behavior, something is wrong.

Have you looked at BBLDR?

The answer is there.

Log any variables that you can in BBLDR to help narrow it down.


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phila_dot

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #32 on: February 24, 2014, 12:10:14 PM »

Quote from: nyet on February 24, 2014, 10:33:24 AM

Can you post a clean 3rd gear pull?

And this, with BBLDR variables if possible


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ibizacupra

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #33 on: March 12, 2014, 02:25:28 AM »

Quote from: phila_dot on February 24, 2014, 12:10:14 PM

And this, with BBLDR variables if possible

Hi

There was no more time to do logs, customer wanted his car back.

However, the fix, unexplained as it is, was we swapped the accl pedal for another one and the problem went away.
Not a single fault code thrown during this whole episode

Weird huh?

Car now runs as it should.


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nyet

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #34 on: March 12, 2014, 03:57:04 PM »

Not too suprising; that is a common failure mode with resistor pots... they're fine when at a static position, but if you move them around a lot, the sweeper hits dead spots as it sweeps and the output drops in and out.


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ibizacupra

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #35 on: March 14, 2014, 10:14:33 AM »

thanks for your help.

weird something like a dbw pedal unit would not fault out given its importance..

2 x pots in the pedal which should track each other (reverse direction to each other) and two more in the tbody also, all 4 of which should mirror each other, yet in this instance all looked ok, pedal sweep worked, yet n75 output remained disabled until stabbing the pedal.

most weird.


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nyet

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	Re: limp mode, TTQS 1.8t, no codes.. swap ecu's software same thing.. very odd « Reply #36 on: March 14, 2014, 12:01:59 PM »

Quote from: ibizacupra on March 14, 2014, 10:14:33 AM

2 x pots in the pedal which should track each other (reverse direction to each other) and two more in the tbody also, all 4 of which should mirror each other, yet in this instance all looked ok, pedal sweep worked, yet n75 output remained disabled until stabbing the pedal.

The lack of faults baffles me too! Like you said, that is the whole purpose to having 2 pots.. unintended acceleration and all that..

Just glad you got it sorted.


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