'01 EV transmission TCU soft code, aggressive acceleration

[markcm2]

I am noticing my 01 EV has a very touchy throttle response when launching. I checked the TCU code and noticed it is set to all Zeros.

Does anyone have an 01-03 and know, or can check, what their TCU soft code is set to?

I also tried a Throttlebody alignment but it made no difference. Any other ideas why the throttle response would be so touchy when launching? We keep a chapstick in the dash pocket and its a challenge to keep if from flying out when accelerating from a stop.

[jjvincent]

TCU is all zeros.

You might want to try removing the throttle body and physically cleaning it. Then go back in and do an adaptation.

[typetwotool]

Is it a drive by wire? Maybe the signal from the pedal is skewed?
_________________
Nathan

80 Vanagon
00 Eurovan
69 Karmann Ghia

[Zeitgeist 13]

My '01 is also touchy off the line, so I'll be curious what you find out, especially if a throttle body service takes care of the issue.
_________________
Casey--

'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik?

[typetwotool]

Saw this yesterday, forgot to put it in the last post. Maybe this will help?

https://www.youtube.com/watch?v=-jde-g_ei1s
_________________
Nathan

80 Vanagon
00 Eurovan
69 Karmann Ghia

[markcm2]

Thanks folks, I will try cleaning the throttlebody and see if that makes any changes.

My idle is fine but I noticed when doing the adaption it seemed to be at around 13% baseline which seemed high.

PS- Thomas EXOVCDS on Youtube is awesome!

[jjvincent]

Just remember, that you got to take the throttle body off of the intake manifold. It just makes cleaning it 110X easier. Since the throttle body is right out in the open, removing the 4 bolts is really easy.

While you are at it, make sure the intake doesn't have a bunch of oil in it either. If the vacuum hose on the PCV is plugged, the blow by all collects in that pipe and runs downhill through the MAF and onto the air filter. So, you won't really know it unless you take the whole pipe off.

In a nutshell, if your going to clean one thing, might as well do the rest while you are in there.

[markcm2]

I cleaned the throttle body today, it did have quite a bit of carbon and crud in there. Then did a TB adaption. Also removed the intake pipe and cleaned it, and some MAF sensor cleaner too.

No change. My accelerator is still jumpy as heck when launching from a stop or at low speeds. If Im on a gravel road and even think about the accelerator, it peels out.

[typetwotool]

You could try checking the Intake Manifold Change-Over Valve -N156- ? My EV is a year older and doesn't have this set up so I'm a bit unfamiliar with it but it looks like, under vacuum it routes intake air through a longer path and as you accelerate and lose intake vacuum it switches to a shorter path? Not sure, seems like it would fail by not switching and the van would seem sluggish but maybe there is a problem with the vacuum supply to the valve?

Good luck.
_________________
Nathan

80 Vanagon
00 Eurovan
69 Karmann Ghia

[gakali]

Does the pedal seem too easy to press ie. weak or broken return spring?

Intake manifold change-over? Interesting idea.
_________________
Why do it? Because you can.

1999 Eurovan
2003 A4 Avant 1.8T Quattro
1992 W201 190e 2.3 Mercedes
2006 W220 S600 V12 Twin Turbo 5.5 Mercedes

[markcm2]

[gakali]

What about the pedal position sensor itself? Not sure off hand the value block but maybe give it a look see too.
_________________
Why do it? Because you can.

1999 Eurovan
2003 A4 Avant 1.8T Quattro
1992 W201 190e 2.3 Mercedes
2006 W220 S600 V12 Twin Turbo 5.5 Mercedes

[markcm2]

[jjvincent]

Log it again but add into it, the vehicle speed. You might have vehicle speed (VSS) sensor starting to go bad.

[typetwotool]

I like that log, gotta' figure out how to do that!

To test the accelerator position sensor log display group 062. No need to have the car running just key on. Press the accelerator slowly and look for any jumps in the readings. Focus on display groups 3 and 4. Sensors -G79- and -G185-
_________________
Nathan

80 Vanagon
00 Eurovan
69 Karmann Ghia

[markcm2]