2010 r36 cannot read engine module with VCDS

[shaunbags]

Hi Guys,

i dont have any trouble using VCDS on my touareg but ive plugged it into my 2010 r36 and i dont get anything from the engine....

i can connect to other bit like the trans but no engine love, been searching here there and everywhere for a while and getting frustrated now haha

i dont have much experience with it and have only used it a few time for basic stuff, probably something simple.

trying to investigate:P2198 O2 Sensor Signal Stuck Rich Bank 2 Sensor
P2098 Post Catalyst Fuel Trim System Too Lean Bank 2

[kamold]

Do you just get 'could not be reached' if you do an autoscan with the car on accessories?

[shaunbags]

ill have another go today (and document it better )

[shaunbags]

OK, getting no response from controller, swapped to all the different usb ports on my laptop.
Cable is a generic usb-serial unit. Although it works fine on my older touareg.
Can communicate with the trans and some others

[kamold]

When you say it's a generic serial to USB cable what exactly do you mean?
Is it not a genuine vcds cable?
So you have access to any other diagnostics software like obd11 or Autel or anything?

[shaunbags]

Hey mate, yes I do mean it's not a genuine cable.
The only other tool I've got is viecar & torque phone app.

[shaunbags]

I just ordered the obd11 + pro.

Looks good.

[Transporter]

OK, getting no response from controller, swapped to all the different usb ports on my laptop.
Cable is a generic usb-serial unit. Although it works fine on my older touareg.
Can communicate with the trans and some others

Let us know if the OBD11 +Pro works on engine control module. The chances are that it won’t, since you can connect to other modules in your car.

“Can communicate with some others” do you mean in your R36 or Touareg?

[shaunbags]

Just ran a full module scan and I can only communicate with the trans on Vcds.
Can ready a fair bit on torque, car is idling up and down from 1100-2000rpm by itself.

The original codes posted have gone after I've gone over the engine.

Not showing any codes while it's idle hunting.

Looked for air leaks and cannot find any, have just got the intake back on so I'm confident it's all plumbed up good.

Gave the MAF a good clean while it was out too.

Timing advance is reading +18 degrees?

Mismatch on O2 sensors 0.3v /0.4v

[kamold]

Could be pcv valve membrane is ruptured.

[shaunbags]

i just did a quick googletube of the PCV on this powerplant.

i suppose i could unplug the hose where it goes into the oil separator chamber and plug it to see what happens

[shaunbags]

ok, its cold in the shed haha.

pulled the PCV hose and plugged it, i though we where onto something as it went into a pretty steady idle but the idle hunting eventually came back same as before, very even and consistent with its duration.

i did note that the measured AFR was leaning out at the top of the revving, like up to 30:1 then back....

ill figure out how to do graphing, try compare o2 sensor voltage to AFR and a couple other fields.

ill update in a week when i get another chance to have a play, out of action from tomorrow.

[shaunbags]

Bit of an update on this one, swapped some O2 sensors around with some second hand units and no change.
Started looking for air leaks thoroughly and didn't find anything, used my LPG torch around all upper manifold connection areas and inlets and couldn't get it to stumble.

Did some learning on long/short term fuel trims then went and observed the car, long terms where anywhere from 25 to 40 percent and the short terms where not fluctuating much which told me it wasn't an air leak.

At the moment I'm pretty sure this is pointing to a crappy MAF, the values seemed to be hanging while it was revving up and down while I was expecting them to fall off with the revs (and airflow)... It just didn't look right to me and what I was seeing physically.

Ive got a used unit on its way now to see if that does anything positive.

[kamold]

I've managed to introduce a vacuum leak in mine
Did timing chains and guides and now there is a definite sucking sound coming from the front corner of the cam cover somewhere above the vacuum pump.
Symptoms (hunting revs at idle) make it look like the PCV valve however I've taken the covers back off and inspected the PCV valve (which I had proactively replaced about 9 months ago) and it's fine.
Cleaned and checked the cam cover gasket no issues there.
Sprayed brake cleaner around the area without any result. Can't see a split hose or plastic anywhere.
Got me a bit stumped at the moment. Can really hear the sound but can't locate it yet.

[shaunbags]

I've managed to introduce a vacuum leak in mine
Did timing chains and guides and now there is a definite sucking sound coming from the front corner of the cam cover somewhere above the vacuum pump.
Symptoms (hunting revs at idle) make it look like the PCV valve however I've taken the covers back off and inspected the PCV valve (which I had proactively replaced about 9 months ago) and it's fine.
Cleaned and checked the cam cover gasket no issues there.
Sprayed brake cleaner around the area without any result. Can't see a split hose or plastic anywhere.
Got me a bit stumped at the moment. Can really hear the sound but can't locate it yet.

Oh no! that is not ideal.
i dont suppose you can smoke test it? i wish they where a bit cheaper to purchase (for what they actually do...)