Hi all im having a nightmare with the MAF on my car at the moment! I have changed the MAF once and still got engine management light on and the car feels sluggish and splutterly for a few weeks then the MAF gives up the ghost (its what happened to the original and only 17k miles) and car wont idle and runs terribly. The only thing i can think of is that when i fitted the BSH induction kit i had to cut back the tape on the MAF wires to enable it to fit further up the intake pipe and must have somehow damaged the wiring in doing it :(. I have a day tomorrow down the garage where i will be able to check all the wiring, but really need the outputs from each terminal i should be expecting. Sorry its such short notice but if someone does have access to any manuals which list the pin configuration i would be hugely grateful.

PS Also if anyone has seen an issue like this before then any info will be a huge help. This is the VAG COM log:

Address 01: Engine

Control Module Part Number: 1Z0 907 115 G

Component and/or Version: 2.0l R4/4V TFSI 0010

Software Coding: 0203000C18070160

Work Shop Code: WSC 73430

2 Faults Found:

000257 - Mass Air Flow Sensor (G70): Implausible Signal

P0101 - 000 - - - MIL ON

Freeze Frame:

Fault Status: 11100000

Fault Priority: 0

Fault Frequency: 1

Mileage: 22265 km

Time Indication: 0

Date: 2017.14.16

Time: 18:34:52

Freeze Frame:

RPM: 2294 /min

Load: 11.0 %

Speed: 0.0 km/h

Temperature: 95.0°C

Temperature: 27.0°C

Absolute Pres.: 1010.0 mbar

Voltage: 13.970 V

000370 - Fuel Trim; Bank 1: System Too Rich

P0172 - 000 - - - MIL ON

Freeze Frame:

Fault Status: 11100000

Fault Priority: 0

Fault Frequency: 1

Mileage: 22265 km

Time Indication: 0

Date: 2017.14.16

Time: 18:38:38

Freeze Frame:

RPM: 758 /min

Load: 25.1 %

Speed: 0.0 km/h

Temperature: 96.0°C

Temperature: 36.0°C

Absolute Pres.: 1010.0 mbar

Voltage: 14.097 V

Edited 1 July, 201213 yr by dainott

No luck so far sorting this issue, but previously BSH customer service has been excellent so have emailed them for a wiring diagram for the expected pin voltages. Cant seem to find them after searching well on google :(

The sensor is a combined MAF (G70) and intake air temp #2 (G299).

Are you sure that the sensor isn't getting wet?

First check that fuse F29 is good. On this car, there are no intermediate connectors. All ECU connections are to the larger 94-pin connector

Pinout is...

1 white/yellow G70 Signal --> ECU pin 23

2 green/yellow G70 Power -ve (Internal ECU supply) --> ECU pin 65

3 black G70 Power +ve (Internal ECU supply) --> fuse F29

4 brown G299 Sender Earth --> ultimately it ends up at ECU pin 12

5 black/blue G299 Signal --> ECU pin 60

HTH

The sensor is a combined MAF (G70) and intake air temp #2 (G299).

Are you sure that the sensor isn't getting wet?

First check that fuse F29 is good. On this car, there are no intermediate connectors. All ECU connections are to the larger 94-pin connector

Pinout is...

1 white/yellow G70 Signal --> ECU pin 23

2 green/yellow G70 Power -ve (Internal ECU supply) --> ECU pin 65

3 black G70 Power +ve (Internal ECU supply) --> fuse F29

4 brown G299 Sender Earth --> ultimately it ends up at ECU pin 12

5 black/blue G299 Signal --> ECU pin 60

HTH

Cheers for the info fella. No issues with the sensor getting wet.

I have done a load of digging on this one and one possible reason is that there is a boost leak (i think i have one in the front plastic intercooler pipe behind the radiators) and the levels being measured do not match and so throwing an implausible error. Gonna repair the pipe and see if that solves the issue and fingers crossed as doing my head in now!

Well finally had a chance to test the signals on each pin and now wondering if someone with a 2.0 TSI can have a little test for me?

Below is the pin config (thank you rwbaldwin) with my outputs logged. Im not bothered about pins 2,3 and 4 as power and earth are fine after checking. I want to know the signal voltages on pin 1 and 5 when the plug is connected to the MAF and when its unplugged (Either will be a huge help). The plug is easily removed and all the pins are numbered. Its just a matter of starting the car, then putting the black lead of a multimeter on the battery negative and then the red on pin 1 and then pin 5 (of the plug when disconnected obviously as there will be no power to the MAF lol). Here's my results:

Pin 1 white/yellow G70 Signal - Plugged in = 3.87v, Unplugged = 6.05v

Pin 2 green/yellow G70 Power (-ve) - fine

Pin 3 black G70 Power (+ve) - fine

Pin 4 brown G299 Sender Earth - fine

Pin 5 black/blue G299 Signal - Plugged in = 1.71v, Unplugged = 3.85v

Any help with this one would be massive as just can seem to figure out what the hell is going on :(

Id love to help you out mate but mine is running abit poor aswell, I used VCDS to test the MAF and expected air flow is down I rang TPS and they want £120 + VAT for a new one.

Id love to help you out mate but mine is running abit poor aswell, I used VCDS to test the MAF and expected air flow is down I rang TPS and they want £120 + VAT for a new one.

Clean it or check for a boost leak. Can't understand why so many MAF's get replaced, I've never had one go yet, on any car.

Clean it or check for a boost leak. Can't understand why so many MAF's get replaced, I've never had one go yet, on any car.

I did the plugs a few weeks ago and the hot wire looked ok and I checked for leaks yesterday and all is ok there too. I havnt cleaned the throttle though or maybe the turbo isnt spinning aswell as it should??

I did the plugs a few weeks ago and the hot wire looked ok and I checked for leaks yesterday and all is ok there too. I havnt cleaned the throttle though or maybe the turbo isnt spinning aswell as it should??

Maybe start a new thread, we don't want to hog Dainott's thread.

Dainott, I'd gladly check mine for you but sadly mines a Tfsi.

Maybe start a new thread, we don't want to hog Dainott's thread.

Dainott, I'd gladly check mine for you but sadly mines a Tfsi.

Agreed, Dainott has a TFSI...

Agreed, Dainott has a TFSI...

Strange he wrote "Well finally had a chance to test the signals on each pin and now wondering if someone with a 2.0 TSI can have a little test for me? "

Edit: just seen his VCDS logs, it is a tfsi.

I'll test it tomorrow night if no one does it before and I remember lol.

...black lead of a multimeter on the battery negative...

You need to be measuring voltages against the sender earth or sender -ve. You shouldn't be comparing to battery -ve.

Yea engine wise its the 2.0 TSI, so its the newer chain driven engine. It a nightmare that VW, Skoda and Seat have TSI and then Audi have TFSI on theirs, but its not the earlier FSI engine.

You need to be measuring voltages against the sender earth or sender -ve. You shouldn't be comparing to battery -ve.

Why's that mate? Im looking for a solid negative to measure each pin voltage from not a wire that could be the cause. If the earth or -ve wire was breaking up then that would throw all the readings out.

Edited 24 August, 201213 yr by dainott

Maybe start a new thread, we don't want to hog Dainott's thread.

Dainott, I'd gladly check mine for you but sadly mines a Tfsi.

Tbh mate i would be intersted to see what the readings are on either the 2.0 FSI or TSI as cant see there being much difference in the MAF setup. As yours is on 07 plate it must be the FSI (belt driven) engine which is the same as the mk5 golf gti. The TSI is the one on the FL octy vRS, mk6 GTI and the scirrocco. It just so happens that mine is a mix of both cars (old front end with new dash and engine).

Thank you to anyone who does manage to get some reading s for me and sorry for being a pain in the arse lol.

I think the tfsi is different.

Mine are

1 white+ yellow

2 earth

3 black

4 blank in the plug but pin is present on Maf

5 as above

I could only get one reading with the plug disconnected. Number 1 read 5.04v

Not sure if this helps but taken from elsawin from an Octavia 09 vRS TSI 147kw engine