A3 c circuit reference.

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white_shepherd86

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Hi just joined the forum, I need help with a 2009 1.9 TDI A3, it has fault code p0698 that is constantly active, other codes will clear etc until after some drivings done and this is the only one bringing on a light. I need to find out what all is on "c circuit". I thought it was g185 accelerator pedal sensor as it was only getting .4v supply to it and traced it back to the ECU Which was only putting out .4v so I replaced the ECU with a 2nd hand one and de immobilised it so the car would run but p0698 is still active and the glow plug light still flashes.




Code: 
Wednesday,29,October,2025,10:28:56:07134
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 25.3.2.0 (x64)  HEX-NET2 CB: 0.4671.5
Data version: 20250822 DS365.0
www.Ross-Tech.com


VIN: WAUZZZ8P59A098353   License Plate: JL08MCC
Mileage: 321860km-199994mi   Repair Order: ALICIA CLEARY



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8P-AU35 (1K0)
Scan: 01 03 08 09 15 16 17 19 25 42 44 46 52 56 62 72

VIN: WAUZZZ8P59A098353   Mileage: 321860km-199994miles

01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: Malfunction 0010
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: Malfunction 0010
42-Door Elect, Driver -- Status: Malfunction 0010
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: Malfunction 0010
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: Cannot be reached 1100
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 03G-906-021-BLS.clb
   Part No SW: 03G 906 056 S    HW: 03G 906 021 AB
   Component: R4 1,9L EDC  000SG  2917 
   Revision: --H09---    Serial number: AUX7Z0I0FN908Y
   Coding: 0000071
   Shop #: WSC 80093 222 69422
   VCID: 372046CDE34C39527F9-8062
   VINID: 9D196AAAA2201494402480C50C4C0FAAAA

4 Faults Found:
001688 - Sensor Reference Voltage C
               P0698 - 000 - Too Low - MIL ON
             Freeze Frame:
                    Fault Status: 11100000
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 321061 km
                    Time Indication: 0
                    Date: 2025.10.15
                    Time: 20:02:43

             Freeze Frame:
                    RPM: 0 /min
                    Speed: 0.0 km/h
                    Bin. Bits: 00100000
                    Bin. Bits: 00000000
                    Bin. Bits: 00100000
                    Bin. Bits: 00100000
                    Bin. Bits: 00000000

005659 - Glowplug for Cylinder 2 (Q11)
               P161B - 000 - Open Circuit
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 321065 km
                    Time Indication: 0
                    Date: 2025.10.16
                    Time: 06:58:41

             Freeze Frame:
                    RPM: 0 /min
                    Speed: 0.0 km/h
                    Load: 0.0 %
                    Voltage: 12.31 V
                    Bin. Bits: 00000100
                    Temperature: 13.5°C
                    Bin. Bits: 00110000

005660 - Glowplug for Cylinder 3 (Q12)
               P161C - 000 - Open Circuit
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 321065 km
                    Time Indication: 0
                    Date: 2025.10.16
                    Time: 06:58:41

             Freeze Frame:
                    RPM: 0 /min
                    Speed: 0.0 km/h
                    Load: 0.0 %
                    Voltage: 12.31 V
                    Bin. Bits: 00000100
                    Temperature: 13.5°C
                    Bin. Bits: 00110000

000551 - Sensor 1 for Throttle Plate Position (Bank 2)
               P0227 - 000 - Short to GND - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 1
                    Fault Frequency: 1
                    Reset counter: 255
                    Time Indication: 0

             Freeze Frame:
                    RPM: 0 /min
                    Speed: 0.0 km/h
                    Load: 0.0 %
                    Voltage: 12.54 V
                    Bin. Bits: 00000100
                    Torque: 0.0 Nm
                    Bin. Bits:  1 01  0

Readiness: 1 1 0 0 0

-------------------------------------------------------------------------------
Address 03: ABS Brakes (-----)       Labels:. 1K0-907-379-EC1-V1.clb
   Part No SW: 1K0 907 379 AN    HW: 1K0 907 379 AN
   Component: ESP MK60EC1   H45 0107 
   Revision: 00H45001   
   Coding: 13422012492B0002C80E04E9921C00813800
   Shop #: WSC 54186 001 1048576
   VCID: 7EAE93E980F6C81AFCF-802A

1 Fault Found:
01314 - Engine Control Module
            013 - Check DTC Memory - Intermittent
             Freeze Frame:
                    Fault Status: 00101101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 95
                    Mileage: 321242 km
                    Time Indication: 0
                    Date: 2025.10.17
                    Time: 15:03:23

             Freeze Frame:
                    Count: 7
                    Count: 6
                    Count: 12544
                    Count: 8196
                    Count: 44288
                    Count: 0
                    Count: 0
                    Count: 0


-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8P0-820-047.clb
   Part No: 8P0 820 047 B
   Component: J255  Klima Man H07 0030 
   Shop #: WSC 00000 000 00000
   VCID: 2F307EAD1B1CF192279-807A

1 Fault Found:
00229 - Refrigerant Pressure
            002 - Lower Limit Exceeded

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 8P0-907-279-30-H.lbl
   Part No SW: 8P0 907 279 N    HW: 8P0 907 279 N
   Component: Bordnetz-SG     H54 2801 
   Revision: 00H54000    Serial number: 00000009247678
   Coding: 10A82F81B0141380EF00001C0000000000084A1564010401002800000000
   Shop #: WSC 06314 000 08192
   VCID: 48C235319EB246AA063-801C

   Subsystem 1 - Part No: 8P2 955 119 F  Labels: 1KX-955-119.CLB
   Component: Wischer AU350   H10 0040 
   Coding: 00056595
   Shop #: WSC 06314 

1 Fault Found:
01333 - Door Control Module; Rear Left (J388)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 6
                    Fault Frequency: 97
                    Reset counter: 69
                    Mileage: 320969 km
                    Time Indication: 0
                    Date: 2025.10.14
                    Time: 20:02:00

             Freeze Frame:
                        ON
                    Voltage: 12.10 V
                        ON
                        ON
                        OFF
                        OFF
                        OFF


-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:* 8P0-959-655-10.clb
   Part No SW: 8P0 959 655 J    HW: 8P0 959 655 J
   Component: Airbag AU1042 H06 0090 
   Revision: --------    Serial number: 003000000000 Dataset Number: 8P0909602L  0002
   Coding: 303142383038303030374A55305238503053
   Shop #: WSC 06314 000 00000
   ASAM Dataset: EV_Airba10AURB4 001001
   ROD: EV_Airba10AURB4_AU35.rod
   VCID: 49C430358938BFA219D-801C

   Crash sensor for side airbag: driver side:
   Serial number: 3572DRB4000087B4A1F%

   Crash sensor for side airbag: passenger side:
   Serial number: 3582DRB4000087D0D8F8

   Rear Side Airbag Crash Sensor (on driver's side):
   Serial number: 35128RB4000048D515AL

   Passenger side rear thorax airbag crash sensor:
   Serial number: 35228RB4000048DAFC61

   Crash sensor for front airbag: driver side:
   Serial number: 35547RB400004A384A3M

   Crash sensor for front airbag: passenger side:
   Serial number: 35647RB400004A37343F

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
   Part No SW: 1K0 953 549 AH    HW: 1K0 953 549 AH
   Component: J0527           036 0070 
   Coding: 0000002
   Shop #: WSC 06314 000 00000
   VCID: 78A285F1AED2F62AB63-802C

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8P0-920-xxx-17-MY8.clb
   Part No SW: 8P0 920 982 C    HW: 8P0 920 982 C
   Component: KOMBIINSTR. VDO H19 0860 
   Revision: D0H19007    Serial number: 2240I007013349
   Coding: 0006428
   Shop #: WSC 80093 222 69422
   VCID: 392440F5D5582F2289D-806C

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 1K0-907-530-V4.clb
   Part No SW: 1K0 907 530 S    HW: 1K0 907 951
   Component: J533__Gateway   H16 0210 
   Revision:   H16       Serial number: 3400K0911405EA
   Coding: E9807F06000202002103
   Shop #: WSC 06314 000 00000
   VCID: 372046CDE34C39527F9-8062

1 Fault Found:
01333 - Door Control Module; Rear Left (J388)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 48
                    Mileage: 320969 km
                    Time Indication: 0
                    Date: 2025.10.14
                    Time: 20:02:21


-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 8P0 920 982 C    HW: 8P0 920 982 C
   Component: KOMBIINSTR. VDO H19 0860 
   Revision: D0H19007    Serial number: AUX7Z0I0FN908Y
   Shop #: WSC 00000 000 00000
   VCID: 392440F5D5582F2289D-806C

1 Fault Found:
02241 - Engine Control Module; Immobilizer Data not Adapted
            000 - - - Intermittent

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 8P0-959-801-MIN3.lbl
   Part No SW: 8P0 959 801 K    HW: 8P0 959 801 K
   Component: Tuer-SG         H03 0060 
   Coding: 0000692
   Shop #: WSC 06314 000 00000
   VCID: 43D8221DA79465F2D31-8016

3 Faults Found:
01552 - Motor for Central Locking; Drivers Door (V56); Lock
            012 - Electrical Fault in Circuit - Intermittent
00928 - Locking Module for Central Locking; Front Driver Side (F220)
            008 - Implausible Signal - Intermittent
01333 - Door Control Module; Rear Left (J388)
            004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb
   Part No: 1K0 909 144 E
   Component: EPS_ZFLS Kl. 232    2501 
   Revision: 00H15000   
   Shop #: WSC 02069 000 90108
   VCID: 2C0A69A12A0A8A8A02B-8078

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 8P0-959-433.lbl
   Part No: 8P0 959 433 J
   Component:    KSG          H11 0080 
   Coding: 1980202002186D0985054C9FC637
   Shop #: WSC 06314 000 00000
   VCID: 43D8221DA79465F2D31-8016

   Subsystem 1 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H03 1301

   Subsystem 2 - Part No: 1K0 907 719 C
   Component: Neigungssensor  005 0003

   Subsystem 3 - Part No: 8P0 951 177
   Component: Innenraumueberw.H04 0020

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb
   Part No SW: 8P0 959 802 K    HW: 8P0 959 802 K
   Component: Tuer-SG         H03 0060 
   Coding: 0000692
   Shop #: WSC 06314 000 00000
   VCID: 44DA2101A29A62CAEAB-8010

2 Faults Found:
02071 - Local Databus
            004 - No Signal/Communication
00929 - Locking Module for Central Locking; Front Passenger Side (F221)
            008 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8J0-035-1xx-56.clb
   Part No SW: 8P0 035 152 C    HW: 8P0 035 152 C
   Component: R Chorus2+      H20 0270 
   Revision: 00H20000    Serial number: AUZ1Z2I9600050
   Coding: 0000221
   Shop #: WSC 06314 000 00000
   VCID: 2B086ABD2F048DB20B1-807E

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left
Cannot be reached

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 8P4-959-802.lbl
   Part No SW: 8P4 959 802 E    HW: 8P4 959 802 E
   Component: Tuer-SG         H04 0040 
   Coding: 0000144
   Shop #: WSC 06314 000 1012544
   VCID: 42D62719B88E6CFAD87-8016

No fault code found.

End----(Elapsed Time: 01:16, VBatt start/end: 12.0V/12.0V. VIgn 11.9V)-----
------------------------------14 Faults Found------------------------------
 
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   #4  
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white_shepherd86

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Tested again and tried giving the sensor 5v from the other sensor in the pedal and it cleared the fault, so when I removed the wire I used to bridge across to make a permanent fix it didn't bring the fault back on and it is now getting it's 5v.
 
   #5  
T

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Do not put the 5V together at the pedal, unless you like gambling your life. Because the next single failure (0V line fault) will cause ecu to think you pressed the pedal to full.

Just DO NOT DO IT. You might hurt others for no fault of their own.
 
   #6  
Dr Sheldon

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Have you considered a broken wire.
 
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white_shepherd86

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TTT said:
Do not put the 5V together at the pedal, unless you like gambling your life. Because the next single failure (0V line fault) will cause ecu to think you pressed the pedal to full.

Just DO NOT DO IT. You might hurt others for no fault of their own.
Click to expand...
How would that work? It's the 5v supply to 5v supply, I could see it happen if it was the signal wire back to the ECU or something, if it drops it's supply to both sensors the pedal doesn't work.
 
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white_shepherd86

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Dr Sheldon said:
Have you considered a broken wire.
Click to expand...
I had but have no idea what wires to look for as I don't know what "c" circuit is and what sensors are on it. V at the plug match V from the ECU and earth have 0 ohms. So I think wires to the pedal are good. Where could I find out what sensors are on that circuit
 
   #9  
Dr Sheldon

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white_shepherd86 said:
I had but have no idea what wires to look for as I don't know what "c" circuit is and what sensors are on it. V at the plug match V from the ECU and earth have 0 ohms. So I think wires to the pedal are good. Where could I find out what sensors are on that circuit
Click to expand...
Wiring Diagram from Erwin << Click on Erwin
 
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white_shepherd86 said:
How would that work? It's the 5v supply to 5v supply, I could see it happen if it was the signal wire back to the ECU or something, if it drops it's supply to both sensors the pedal doesn't work.
Click to expand...

Because frankly, you do not understand electrics and electronics. You have been warned, up to you now. Be aware, VIN is public, license plate as well, if there is a crash, you will be found, internet does not forget anything.

VIN: WAUZZZ8P59A098353 License Plate: JL08MCC Mileage: 321860km-199994mi Repair Order: ALICIA CLEARY
 
   #11  
Dr Sheldon

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white_shepherd86 said:
How would that work? It's the 5v supply to 5v supply, I could see it happen if it was the signal wire back to the ECU or something, if it drops it's supply to both sensors the pedal doesn't work.
Click to expand...

Lets agree that is far better and safer to fix it correctly.
 
   #13  
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white_shepherd86

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Dr Sheldon said:
Lets agree that is far better and safer to fix it correctly.
Click to expand...
Oh it will be fixed correctly, why could giving it an alternative 5v supply be a problem? Isn't it the signal back to the ECU that determines the ecus outputs? Or am I missing something.
 
   #14  
Dr Sheldon

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white_shepherd86 said:
Oh it will be fixed correctly, why could giving it an alternative 5v supply be a problem? Isn't it the signal back to the ECU that determines the ecus outputs? Or am I missing something.
Click to expand...
Remember that your hosts on this forum may have some culpability. When it comes to safety issues it would be wise to be cautious for everyone's sake.

Just get a diagram and look for the break or the ECU output on that pin.

It seems that you are more than capable !
 
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white_shepherd86

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Dr Sheldon said:
Remember that your hosts on this forum may have some culpability. When it comes to safety issues it would be wise to be cautious for everyone's sake.

Just get a diagram and look for the break or the ECU output on that pin.

It seems that you are more than capable !
Click to expand...
I'll rewind. We seem to have got off on the wrong foot. Ttt seems to think I've done something wrong. At the moment the car sits in original condition, no repairs done. Faults have cleared after I tested in situ, not driving, I've asked him for clarification on how giving it an alternative 5v supply would give the car full throttle. I don't see how but everydays a school day. I know the ECU output for that pin, it's giving same voltage as I'm getting at the pin on the throttle plug. I cannot find diagrams anywhere on the internet

My main questions are where can I get a wiring diagram/schedule and does anyone know what sensors are on "c" circuit?
 
   #16  
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Its late now here, I will come back next day(s) with some explanatory pictures.
 
   #20  
Dr Sheldon

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You need to suspect and may need to unplug every 5v Sensor connected to that ECU. Regardless of Circuit a, b, c or d. Often they are all connected in the module !!

First cut the wire that feeds the pedal - What you got.
 
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