hrm. this is like when you go into the doctor and tell him your shoulder hurts, and he sees a broken bone sticking out of your arm.. we need to fix this first, he tells you, but what he doesnt know is youve been shot three times in the back. .. i mean.. it has to be fixed.. no doubt. dont know if its the biggest issue. it definitely has to be resolved. this illustration works with many problems/situations on this car.. lol..

 

Got the VAG Com in today.. Here's what it says..

Chassis Type: 8D - Audi A4 B5
Scan: 01,02,03,08,15,16,17,25,35,37,45,55,56,57,67,75,76 ,77

-------------------------------------------------------------------------------
Address 01: Engine Labels: 078-907-551-AZA.LBL
Controller: 8D0 907 551 M
Component: 2.7l V6/5VT G 0002
Coding: 06711
Shop #: WSC 87119
VCID: 341B9FD31735
2 Faults Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-00 - -
17521 - Shareware Version. To Decode all DTCs
P1113 - 35-10 - Please Register/Activate - Intermittent
Readiness: 0010 0100

The Mass Code is what i've been fighting the whole time.. When the N75 Valve comes in, i'll see if the boost leak was the cause.. hopefully.

From what I've read so far the 17521 is O2 sensor.. Passenger side pre cat. I'll have to replace this now?

 

yup your o2 is toast.

here is the ross-tech definition for your maf code... looks like that's toast too.
16486/P0102/000258 - Mass Air Flow (MAF) (G70): Signal too Low
Possible Symptoms
Probably no serious malfunctions
Loss of power
Possible Causes
Wiring and/or connections (short circuit?)
Mass Air Flow (MAF) (G70) defective
Possible Solutions
Check wiring and connections
Check / Replace Mass Air Flow (MAF) (G70)
Special Notes
In MY 1995-2002 (?) in Europe at VW-diesel-cars G70 had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [meas.blocks-08], group 003 (3e gear, full throttle, from 1700-4000rpm)
Retrieved from "http://wiki.ross-tech.com/wiki/index.php/16486/P0102/000258"
Category: Fault Codes

 

Thanks for the reply.. have any suggestions for me since I already replaced my maf? Could it be the wiring?

 

could be the wiring.... what maf did you replace, hitatchi or bosch? maybe the new maf element was bad. was it brand new or reman?

 

hitachi, and i got it used from the forums. I've been looking at forums about the wiring, just not too sure where to start.

 

you can just check the connector and inspect the wires for cracks/corrosion.
the maf may be bad. do you have access to another one you could test with?

 

Alright, Decided to do some wire testing today, and i followed this guide:
Mass Air Flow Sensor, Checking

NoteUse only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor -G70-.
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
- Scan tool

Test requirements

- The Mass Air Flow (MAF) Sensor -G70- fuse OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position “P” or “N”.
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Coolant Temperature at least 80° C.
- Ignition switched off.

Function test
– Connect the scan tool.
– Start engine and let it run at idle.
– Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor -G70- at idle:

Diagnostic text Specified value
Air flow quantity at Mass Air Flow (MAF) sensor
l Engine running at idle
2.00 to 5.00 g/sec

– End diagnosis and switch ignition off.

If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) Sensor -G70-:
– Check voltage supply of Mass Air Flow (MAF) Sensor -G70- → Anchor.

If specified value was not obtained:
– Check the Mass Air Flow (MAF) Sensor -G70- electrical circuit → Anchor.

Checking voltage supply

– Disconnect the Mass Air Flow (MAF) Sensor -G70- electrical harness connector -1-.
– Start the engine and let it run at idle.
– Using a multimeter, check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminal 2 to engine Ground (GND).

Specified value: battery voltage.
– Switch the ignition off.

If specified value was not obtained:
– Check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminal 2 to theFuel Pump Relay -J17- terminal 2 for an open circuit.
Specified value: 1.5 Ω max.

If no malfunction is detected in the wiring and if the voltage supply was OK:
Checking electrical circuit

If the manufacturers test box is being used. Perform the following step.
– Install the test box. Refer to

→ Fuel Injection and Ignition; Rep. Gr. 24; Fuel Injection System, Servicing.

If the manufacturers test box is not being used. Perform the following step.
– Remove the Motronic Engine Control Module (ECM) -J220-. Refer to → Chapter.

– Using a multimeter, check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector terminals for an open circuit.

Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminals Motronic
1
3
4

Engine Control Module (ECM) -J220- electrical connect or test box socket
1= 53
3= 27
4= 29

Specified value: 1.5 Ω max.

If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
– Check the electrical harness connector for damage, corrosion, lose or broken terminals.

– If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:
– Replace Mass Air Flow (MAF) Sensor -G70-

→ Fuel Injection and Ignition; Rep. Gr.24; Fuel Injection System, Servicing.

If no malfunction is detected in the wiring and if the voltage supply was not OK:
– Replace the Motronic Engine Control Module (ECM) -J220-. Refer to → Chapter.

Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1 - Check the DTC memory. Refer to → Chapter.
2 - If necessary, erase the DTC memory. Refer to → Chapter.
3 - If the DTC memory was erased, generate readiness code. Refer to → Chapter.
– End of diagnosis.



Everything checked out, except the MAF signal wire (Terminal 4 on the MAF connector). So Here is where i'm stuck.
– Using a multimeter, check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector terminals for an open circuit.
Engine Control Module (ECM) -J220- electrical connect or test box socket
1= 53
3= 27
4= 29
I don't have a test box, so i'm testing directly from the ECM Harness, and the only diagram i have, from bentley, shows this harness

and upon inspection, this is the harness that i have on my 2002:

So i have no idea where connection 29 is to even test for an open circuit.. I've tried searching.. with nothing to show. Any ideas? Thanks a lot.