@BWings that the one I got from Audi dealer here...
anyway I found some nices thing today...
PIN 3 from MAF which go to ECU then GND...
I CHECKED pin 3 from BOTH MAF then do a COMPARE...
here is BANK 2 read 4.3 ohm then when I'm knock in the ECU it change the resistant... sometimes OL...



and here is BANK 1 ... 0,8 OHM constant...







then I follow the wiring diagram.. to check that the PIN 3 which actually going to pin 27 of ECU 2..
then I found out the Pin 27 on ECU 2 not solder well... I solder it back then it read constant 0.8 ohm like Bank 1...

Today is Thunder storm.. I will wait the weather back to normal then test it then let you guy know

 

NG,

While you have this much access, one more remote possibility. If you can reach the pressure sensor in the leftside intercooler, check wiring and sensor. This pressure sensor also inputs to the ECU for fueling. Here again, I cannot find any examples this sensor failure leads to a P2190, but it is very difficult to reach unless you have disassembled like you have. A good opportunity. #12 in this image.

I am not sure I am following your last post.

 

 

NG,

Make sure the large hoses to and from the leftside intercooler have good connections no cracks or leaks in the hoses.

OK I saw a note in your last post I missed. Bad solder a common problem. If this is your issue, You are a very good diagnostician!

 

@BWings I did check the sensor as u said plus I swap the sensor from bank 1 to Bank 2.. also..
I did check all the hose of course when I'm doing a clean up... it has a lot of DUST there..
I 'm using the Foam Cannon to clean it up

 

NG - you are very impressive with your automotive knowledge!

I enjoy very much working with you online. I look forward to this problem being solved for you!

 

30 miles Test Drive..
no more MAF code...
I will continue to test .. then report u guy

 

200 miles test drive today...
no more CEL... I think I found the problem...
will do 1000 miles test then let you guy know...

 

Today I look at the diagram again... and Find out why if PIN 27 (GND FROM ME 7.1.1) getting loose it will set multi code which Include
SAI Pressure sensor
Boost Pressure Sensor...

if u look at the diagram.. both SAI Pressure Sensor and MAF sensor both going to Pin 27 they use the same GND..
so If one lost GND both will lost GND also => 2 fault code set then Misfire due to In correct Air Measurement...

SAI connect to Boost Pressure sensor.. then if SAI lost Power Boost Pressure Sensor will do the same...

Good Start for anyone who has the same issue...

 

ONE more THING....
If pin 27 fail completely...
DO U THINK WE CAN USE DIRECT GND ? bypassing the ECU GND

 

I hope I am not speaking too soon, but congratulations!

You are a very good risk taker with much electrical knowledge!

Not sure on the ground. In theory, yes on a bypass because a ground is a ground. My concern is this is all low voltage circuits 5v, and digital electronics on a Can bus, but could make a fix like yours simple.

Best to you sir!

 

@BWings CAN BUS is diffirent category... they are PWM and if u use PicoScope u can measure the data...
inside each module which has CAN BUS they has a phillips ic which use for control can bus...( sent can signal)
I play with it some times in Mercedes but never try on Bentley or VAG car before... Haven't have a chance yet
but in theory they basically same..
some newer car like bmw they use ENET (ethernet connection) which has ip address like the computer and the central gateway fail alot...
Anyway... I don't understand the point of using ENET on car but most of Manufacturer now using it even Audi... maybe for better multimedia head-unit data transfer.. but they just break down alot...

I would stick with old fashion way.. HP is HP .. and Torque is Torque... I don't understanding the point of using Direct Injection.. they save u about 15% in Gas Milesage but when they break down it cost twice of Money to replace it...

I heard U has Corvette also.. will u buy a C8.. that is nice car..

 

Yes, 3 Corvettes. I attended the C8 touring reveal when it came to Phoenix. The C8 is now on my list of future cars. Not this first year, and GM claims they have already sold the entire 2020 production. Maybe 2021 or 2022 when some bugs are gone.

 

@BWings that is a nice one.. I want a Z06 or ZR1 version... but this car will be hell expensive here...
anyway.. my uncle is living in Phoenix Arizona... one day if I visit him maybe we can meet together
Nice to meet you too..
I was in USA 5 year ago.. it is a nice country.. I had school there... people is so nice

 

NG - yes PLEASE contact me if you visit Phoenix.

The Z06 (C8) is rumored to be coming with 800hp. But the car will need AWD which is also rumored. In fact too many rumors such as a hybrid version like the 918 Spyder.

Past that my wish for the Z06 is more improvements in the engine as GM uses a 100 year old pushrod design. I would like to see DOHC and a flat plane crankshaft with forced induction. Maybe even a V10 or 12, but too much to expect from GM. I think the Z06 motor will be smaller L like 4.2L or 4.0L instead of 6.2L or 7.0L.