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Thread: 2015 Audi A5 Adblue System Fault - P204F Reductant System Performance Bank 1 Fault

  1. #1
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    2015 Audi A5 Adblue System Fault - P204F Reductant System Performance Bank 1 Fault

    Hi all - first post.....

    I have a 2015 A6 (Ultra engine etc.) - wife phoned me the other week while I was away from home with work telling me that the Adblue needed filling (she had the information message on the dashboard). I asked my 18yo son to fill the Adblue tank as I usually do it myself, don't usually have any issues with the fill. Famous last words.

    After my son had filled the Adblue tank and had started the car to check that the information message had been cleared, they were presented with the Adblue System Fault message and amber/yellow warning triangle on the dashboard. I'm now back home trying to diagnose the issue.

    My working hypothesis is that the tank may have been over-filled and that the internal Adblue sensor can't detect the amount of fluid in the tank.

    I ran a scan using VCDS the other day, output below - I've received the P204F 00 [101] - Reductant System Performance Bank 1 fault code.

    I'm thinking that the next step is to

    1. Reset of SCR tank level detection and then
    2. Reset the SCR lock.

    Anything else that the forum would recommend?

    Cheers, Nick.

    ps. Yup, I have a few other faults that I've cleared after this scan (with the exception of the HVAC fault).

    Code:
    Saturday,04,April,2020,13:29:46:26294
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86(VMWare)
    VCDS Version 20.4.0.1  HEX-V2 CB: 0.4508.4
    Data version: 20200331 DS317.0
    www.Ross-Tech.com
    
    
    VIN: WAUZZZ4G5FN053682   License Plate: N200 NGH-4-4-20
    Mileage: 108440km-67381mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 4G-AU57 (4G0)
    Scan: 01 02 03 05 08 09 15 16 17 19 20 28 3B 42 44 46 52 53 55 5F
              62 6D 72 AC
    
    VIN: WAUZZZ4G5FN053682   Mileage: 108440km-67381miles
    
    01-Engine -- Status: Malfunction 0010
    02-Auto Trans -- Status: OK 0000
    03-ABS Brakes -- Status: Malfunction 0010
    04-Steering Angle -- Status: OK 0000
    05-Acc/Start Auth. -- Status: Malfunction 0010
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: OK 0000
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: Malfunction 0010
    19-CAN Gateway -- Status: OK 0000
    20-High Beam Assist. -- Status: OK 0000
    28-HVAC, Rear -- Status: Malfunction 0010
    3B-Sensor Elect. -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    53-Parking Brake -- Status: OK 0000
    55-Headlight Range -- Status: OK 0000
    5F-Information Electr. -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    6D-Trunk Elect. -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    AC-Reductant Control -- Status: OK 0000
    -------------------------------------------------------------------------------
    Address 01: Engine (J623-CNHA)       Labels:. 04L-907-309-V1.clb
       Part No SW: 04L 906 021 FQ    HW: 04L 907 309 
       Component: R4 2,0L EDC   H23 0655  
       Revision: 85H23---    
       Coding: 12254012242401080000
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_ECM20TDI01104L906021FQ 002002
       ROD: EV_ECM20TDI01104L906021FQ_002.rod
       VCID: 79AFEA88395F39A314C-802D
    
    1 Fault Found:
    28653 - Reductant System Performance Bank 1 
              P204F 00 [101] - Malfunction
              Not Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 108195 km
                        Date: 2020.03.20
                        Time: 11:42:32
    
                        Engine speed: 1295.00 /min
                        Normed load value: 0.0 %
                        Vehicle speed: 100 km/h
                        Coolant temperature: 89 °C
                        Intake air temperature: 64 °C
                        Ambient air pressure: 1020 mbar
                        Voltage terminal 30: 14.500 V
                        Unlearning counter according OBD: 40
                        Air mass at air mass meter 1: 23.1 kg/h
                        Extern.temp.sens.1 bank 1: raw value: 10.0 °C
                        Exhaust recirc.valve 2 bank 1: posit.feedback - Act.value: 99.68 %
                        Exh.recircul.valve 1 bank 1: pos.feedback - Act.value: 99.32 %
                        NOx sensor before SCR cat conv: NOx emiss: 53 ppm
                        NOx sensor before SCR cat conv: offset correction factor: 3 ppm
                        Current temperature in NOx reducing catalytic converter: 331.8 °C
    
    Readiness: 0 0 0 0 0 
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans (J217)       Labels:| 0CJ-927-156.clb
       Part No SW: 4G0 927 153 L    HW: 0CK 927 156 Q
       Component: 0CK 20TDI RdW H01 0002  
       Revision: --H01---    Serial number: 0000000053
       Coding: 100001
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_TCMDL382021 002014
       ROD: EV_TCMDL382021_VW51.rod
       VCID: 323D1DA4A4A90AFB956-8067
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes (J104)       Labels:. 4G0-907-379-V2.clb
       Part No SW: 4G0 907 379 Q    HW: 4G0 907 379 Q
       Component: ESP9 Premium  H01 0420  
       Revision: --------    Serial number: --------------
       Coding: 06A29E41604579829B00
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_ESP9BOSCHAU57X 003019
       ROD: EV_ESP9BOSCHAU57X_003.rod
       VCID: 3FDB449067FBD7936A8-806B
    
    3 Faults Found:
    124416 - Function Restriction due to Faults in Other Modules 
              U1113 00 [032] - -
              [Ldm_ApbFailureState]
              Intermittent - Not Confirmed - Tested Since Memory Clear
    
    161536 - Tire Pressure Warning 
              C102D 00 [040] - -
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 108113 km
                        Date: 2020.03.20
                        Time: 10:49:02
    
                        VzRef: 6B
                        Bit Info 1: 00
                        Bit Info 2: 40
                        Bit Info 3: 26
                        Bit Info 4: 1F
                        Uz: BB
                        Unlearning counter according OBD: 36
    
    161792 - Tire Pressure Warning 
              C102D 00 [040] - -
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 108113 km
                        Date: 2020.03.20
                        Time: 10:49:02
    
                        VzRef: 6B
                        Bit Info 1: 00
                        Bit Info 2: 40
                        Bit Info 3: 26
                        Bit Info 4: 1F
                        Uz: BB
                        Unlearning counter according OBD: 36
    
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
       Part No SW: 4H0 907 064 FN    HW: 4H0 907 064 EN
       Component: BCM2 2.0      H36 0560  
       Revision: 00002001    
       Coding: 01B9704E000000000000
       Shop #: WSC 02391 785 00200
       VCID: 7AADF5843CD932BB1D6-802F
    
       Subsystem 2 - Part No SW: 4H0 905 852 C    HW: 4H0 905 852 C
       Component: J764 ELV MLB  H40 0046 
       Serial number: 3214000170913010    
    
    1 Fault Found:
    00956 - Key 2 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 3
                        Fault Frequency: 3
                        Reset counter: 55
                        Mileage: 105460 km
                        Time Indication: 0
                        Date: 2020.01.21
                        Time: 14:30:51
    
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels:| 4G0-820-043-4Z.clb
       Part No SW: 4G0 820 043 CC    HW: 4G0 820 043 CC
       Component: KLIMA 4 ZONEN H14 0112  
       Serial number: 18121400040609
       Coding: 34220978210000
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_AirCondiComfoUDS 003008
       ROD: EV_AirCondiComfoUDS_003.rod
       VCID: 629DADE4B4C9DA7B256-8037
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V2.clb
       Part No SW: 4H0 907 063 DH    HW: 4H0 907 063 AH
       Component: BCM1 2.0      H20 0311  
       Revision: 15020001    Serial number: 00000968901002
       Coding: 0105001440349FE041014080000018000F9DC7082F08020100000894E100140200400024030000
       Shop #: WSC 02391 785 00200
       VCID: 71BFD2A861AF71E3ACC-8025
    
       Subsystem 1 - Part No SW: 4G2 955 119     HW: 4G8 955 119 A  Labels: 1KX-955-119.CLB
       Component: WWS57X 141118  H37 0080 
       Serial number:         141128202932
       Coding: 0045F7
    
       Subsystem 2 - Part No SW: 8U0 955 559 B    HW: 8U0 955 559 B  Labels: 8U0-955-559.CLB
       Component: G397_RLFS  H06 0002 
       Serial number: 23619069            
       Coding: 02006D
    
       Subsystem 3 - Part No SW: 4G0 941 531 BE    HW: 4G0 941 531 BE
       Component: E1 - LDS  H07 0044 
       Serial number: 17 12 2014  00000698
    
       Subsystem 4 - Part No SW: 4H0 907 658     HW: 4H0 907 658 
       Component: AQ_Hum_Sensor  H03 0003 
       Serial number: 85498567000000000001
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags (J234)       Labels:* 4H0-959-655.clb
       Part No SW: 4H0 959 655 H    HW: 4H0 959 655 H
       Component: Airbag10.43   H82 0086  
       Revision: --------    Serial number: 003P1002R1X6
       Coding: 30333130313630323639554A305234473053
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_AirbaAU10BPAAU64X 001014
       ROD: EV_AirbaAU10BPAAU64X_VW51.rod
       VCID: 3B23308073E3CBB3460-806F
    
       Crash sensor for side airbag: driver side: 
       Serial number: 3575HRB405B2UKGU3GEB
    
       Crash sensor for side airbag: front passenger side: 
       Serial number: 3585HRB404P2UMTK982G
    
       Crash sensor for side airbag: rear: driver side: 
       Serial number: 3515JRB40553201UB1NR
    
       Crash sensor for side airbag: rear: passenger side: 
       Serial number: 3525JRB406732Q982GTC
    
       Crash sensor for front airbag: driver side: 
       Serial number: 3554VRB404T33RVOEO5$
    
       Crash sensor for front airbag: front passenger side: 
       Serial number: 3564VRB404T33RVOL9H1
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
       Part No SW: 4H0 953 568 K    HW: 4H0 953 568 K
       Component: Lenks.Modul   H06 0005  
       Revision: C0068538    Serial number: 90862NLG0003O 
       Coding: 000035
       Shop #: WSC 02391 785 00200
       VCID: 3B2330807363CBB3460-806F
    
       Subsystem 1 - Part No SW: 4G0 951 528 A    HW: 4G0 951 528 A
       Component: E221 - MFL  H08 0010 
       Serial number: 25 11 2014  E0080082
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:| 4H0-920-xxx-17.clb-SRI1
       Part No SW: 4G8 920 951 A    HW: 4G8 920 951 A
       Component: MDieGb        H43 0506  
       Revision: 28450303    Serial number: 658161214592001
       Coding: 33A612000B412600010000
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_RBC7KMID 004050
       ROD: EV_RBC7KMID.rod
       VCID: 2E0509D4B0912E1BF1E-807B
    
    1 Fault Found:
    1048578 - No Basic Setting 
              B2010 00 [009] - -
              [Steuergerät keine oder falsche Grundeinstellung / Adaption]
              Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 6
                        Fault Frequency: 1
                        Reset counter: 202
                        Mileage: 105460 km
                        Date: 2020.01.17
                        Time: 11:25:57
    
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:* None
       Part No SW: 4G0 907 468 AE    HW: 4G0 907 468 AC
       Component: J533--Gateway H13 0075  
       Revision: --------    Serial number: 00000001533640
       Coding: C0CD074418
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_GatewPkoUDS 001024
       ROD: EV_GatewPkoUDS_001_AU57.rod
       VCID: 73B3D8A01B3343F35E0-8027
    
       Battery Monitoring Control Module: 
       Subsystem 1 - Part No SW: 8T0 915 181     HW: 8T0 915 181 
       Component: J367-BDMHella  H03 8041 
       Serial number: 6051795203          
    
       Voltage stabilizer: 
       Subsystem 2 - Part No SW: 8K0 959 663 D    HW: 8K0 959 663 D
       Component: J532_DCDCStab  H23 0022 
       Serial number: 14101600000000000788
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 20: High Beam Assist. (J844)       Labels:. 8K0-857-511.clb
       Part No SW: 8T0 857 511 AD    HW: 8T0 857 511 AD
       Component: FLA           H04 0012  
       Revision: AA001002    
       Coding: 04028264747464545425363E00
       Shop #: WSC 02391 785 00200
       VCID: 7CA1F39C36ED0C8B0FA-8029
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 28: HVAC, Rear (E265)       Labels:* 4G0-919-158.clb
       Part No SW: 4G0 919 158 Q    HW: 4G0 919 158 Q
       Component: KLIMA FOND    H08 0112  
       Serial number: 08011500041261
       Coding: 22
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_ClimaContrUnitRearUDS 003004
       ROD: EV_ClimaContrUnitRearUDS_003.rod
       VCID: 3D273E986DF7C583784-8069
    
    1 Fault Found:
    0075 - Button or Switch in Operating Unit 
              B10C7 07 [008] - Mechanical Failure
              Intermittent - Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 5
                        Reset counter: 86
                        Mileage: 108053 km
                        Date: 2020.03.18
                        Time: 17:13:53
    
                        Outside air temperature: 16.5 °C
                        Left rear vent temperature: 19.0 °C
    
    
    -------------------------------------------------------------------------------
    Address 3B: Sensor Elect. (J849)       Labels: 4G0-907-637.clb
       Part No SW: 4G0 907 637 H    HW: 4G0 907 637 D
       Component: SARA 3D       H04 0056  
       Revision: --------    Serial number: EJ1BPA720F4K98
       Shop #: WSC 00000 000 00000
       ASAM Dataset: EV_SARA2 005012
       ROD: EV_SARA2.rod
       VCID: 333318A05BB303F39E0-8067
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:. 4H0-959-793.clb
       Part No SW: 4G8 959 793 J    HW: 4G8 959 793 G
       Component: TSG FA        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 011C16014001620002080002
       Shop #: WSC 02391 785 00200
       VCID: 47CB5C703FAB9F53D28-8013
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist (J500)       Labels:| 4G0-909-144.clb
       Part No SW: 4G0 909 144 M    HW: 4G0 909 144 G
       Component: RCEPS         H41 0011  
       Revision: 00001000    Serial number: 0011309715
       Coding: 101000010001
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_RCEPS 009010
       ROD: EV_RCEPS_009.rod
       VCID: 333318A05BB303F39E0-8067
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
       Part No SW: 4H0 907 064 FN    HW: 4H0 907 064 EN
       Component: BCM2 2.0      H36 0560  
       Revision: 00002001    Serial number: 0356701786    
       Coding: 013B0622A0B93000C320090400010F470000000000000000000000000000
       Shop #: WSC 02391 785 00200
       VCID: 7AADF5843CD932BB1D6-802F
    
       Subsystem 1 - Part No: 4G0 951 177 
       Component: DWA-Sensor  H01 0010 
    
       Subsystem 2 - Part No: 1K0 951 605 C
       Component: LIN BACKUP HO  H05 1501 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:. 4H0-959-792.clb
       Part No SW: 4G8 959 792 J    HW: 4G8 959 792 G
       Component: TSG BF        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 011C16014001620002080002
       Shop #: WSC 02391 785 00200
       VCID: 46D5517438A1865B29E-8013
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake (----)       Labels: 4H0-907-801.clb
       Part No SW: 4H0 907 801 H    HW: 4H0 907 801 A
       Component: EPB-4         H04 0015  
       Revision: --------    Serial number: 00000001320271
       ASAM Dataset: EV_ParkiBrake 001028
       ROD: EV_ParkiBrake_VW51.rod
       VCID: 2D070ED8BD975503C84-8079
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range (J745)       Labels:| 4H4-907-357-V2.clb
       Part No SW: 4H4 907 357 D    HW: 7P6 907 357 B
       Component: MxB-ECU       001 0081  
       Revision: --------    Serial number: --------------
       Coding: 04FE02102A600200
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_HeadlRegulAUDIMXBAU64X 005003
       ROD: EV_HeadlRegulAUDIMXBAU64X_005_AU57.rod
       VCID: 333318A05BB303F39E0-8067
    
       Led Headlamp Powermodule Left: 
       Subsystem 1 - Part No SW: 7PP 941 472 J    HW: 7PP 941 472 J  Labels: 3D0-941-329.CLB
       Component: LED LeiMo li.  H07 7560 
       Coding: E01E00
    
       Led Headlamp Powermodule Right: 
       Subsystem 2 - Part No SW: 7PP 941 472 J    HW: 7PP 941 472 J  Labels: 3D0-941-329.CLB
       Component: LED LeiMo re.  H07 7560 
       Coding: E01E00
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 5F: Information Electr. (J794)       Labels: Redir Fail!
       Part No SW: 4G1 035 192 A    HW: 4G1 035 192 A
       Component: RMC Nav Plus  H61 0139  
       Coding: 0101010101415B47082B060301010000000000
       Shop #: WSC 02391 785 00200
       VCID: 211FE2E8F1CF81637CC-8075
    
       Subsystem 1 - Part No: 8X0 919 884 H
       Component: P28-50-14.06  0001 
    
       Subsystem 2 - Part No SW: 4G0 919 603 B    HW: 4G0 919 603 B
       Component: DU6 Basic  H43 0084 
       Serial number: 9464K40E2693265     
    
       Subsystem 3 - Part No SW: 4G2 919 610 E    HW: 4G2 919 610 E
       Component: E380 BDT C7  H20 0250 
       Serial number: 90349NL60003H       
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left (J388)       Labels:. 4H0-959-795.clb
       Part No SW: 4G8 959 795 J    HW: 4G8 959 795 G
       Component: TSG HL        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 010814004001620002080002
       Shop #: WSC 02391 785 00200
       VCID: 49CF5A4829BF6923C4C-801D
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6D: Trunk Elect. (----)       Labels:* Redir Fail!
       Part No SW: 4G9 959 107 C    HW: 4G9 959 107 B
       Component: HDSG-Modul    H05 0150  
       Revision: 14005001    Serial number: 349400864
       Coding: 093205C010
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_HDSGAu572 001022
       ROD: EV_HDSGAu571.rod
       VCID: 363521B448C116DBB9E-8063
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right (J389)       Labels:. 4H0-959-795.clb
       Part No SW: 4G8 959 795 J    HW: 4G8 959 795 G
       Component: TSG HR        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 010814004001620002080002
       Shop #: WSC 02391 785 00200
       VCID: 49CF5A4829BF6923C4C-801D
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address AC: Reductant Control (J880)       Labels: 4G0-907-355.clb
       Part No SW: 4H0 907 355 D    HW: 4G0 907 355 B
       Component: SCR-Stg-G2    H10 0012  
       Revision: 00000000    Serial number: 143350110
       ASAM Dataset: EV_RDCMA00100 008040
       ROD: EV_RDCMA00100.rod
       VCID: 2D070ED8BD975503C84-8079
    
    No fault code found.
    
    End----(Elapsed Time: 01:46, VBatt start/end: 11.9V/11.9V. VIgn 11.8V)-----

  2. #2
    Ross-Tech Employee Jef's Avatar
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    Address 01: Engine (J623-CNHA) Labels:. 04L-907-309-V1.clb
    Part No SW: 04L 906 021 FQ HW: 04L 907 309
    Component: R4 2,0L EDC H23 0655
    In before Jack points out there is a firmware update for this ECM, looks like you should be at firmware level 1649, not 0655. I think it would be safe to assume firmware updates are tied to "emission concerns" so.... check with your dealer. I don't know what is going on at your side of the pond with extended warranty but it looks like if this were a US market car, you'd be covered.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  4. #3
    Ross-Tech Employee DrPeter's Avatar
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    Hello,

    You could perform the 'resets' ... however, I would suggest an inspection and a test of the N474-Reducing Agent Injector (AdBlue) because this sounds like there is a lack of reducing agent flow.

    With the fault code "Reductant System Performance", this sounds like there is a commanded flow of reducing agent/AdBlue, however there is a lack of effectiveness of the reducing agent/AdBlue as seen by the ECM.

    The test below is for the 3.0L TDI engines, so you may get less than the specified amount out of the N474 injector. And do not let the term 'injector' fool you, the flow out of the N474 is a dribble.. even though there is about 5bar of pressure behind it.


    AdBlue - Testing the N474-Reducing Agent Injector
    1)
    Check Measuring Values: [Long-term adaptation of reduction agent dosage]
    1.00 = Baseline (center) Range = 0.90 to 1.10
    > 1.00 = adding more reducting agent (example 1.02 = clogged injector, High DPF content, poor AdBlue quality, etc...)
    < 1.00 = taking away reducting agent (example 0.95 = leaking injector, etc. . )
    = 1.00 = VW/Audi cheating on the tests or SW flash update needed to cheat (Just a joke)


    2)
    To run the N474 output quantity test..

    Prerequisites:
    - Battery maintainer connected
    - Key on Engine off
    - No ECM fault codes, clear codes
    - Transmission in Park

    3)
    Select [Adaptation]
    Select [Adaptation for metering quantity measurement]
    Normal read value = [04]
    - Change to [02] , [Save] This enables the Basic Settings, a key cycle will reset this to a value of [04]

    4)
    Select [Basic Settings]
    Select [SCR metering quantity test] [Go!]
    [On/Off/Next]

    This BS test will run for about 10 minutes (or more), during this time the N474 will 'slowly' release AdBlue, (spec=25 to 30ml).

    Let us know how this works out for you and let us know if you have any more questions,

    drpeter

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  6. #4
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    How Incendiary............./\


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  7. #5
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    Thanks for the comments guys.

    Unfortunately, due to the current lock-down 'situation', no local dealership is open so might not be able to address the firmware issue for a while.... Is that documented in any TSB's out of interest so I can show them to my local dealer when the time comes?

    I will take a look at the N474 output quantity test in the meantime which I think I can do from home.

    Will report back.

  8. #6
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    So I went for a 1 day subscription of the Audi erwin software and after sticking in the P204F fault code, found a Technical Service Handbook (TSH) relating to my problem (I'm only reproducing the pertinent elements here - not sure what the copyright agreements are):

    Both the Customer Statement and Workshop Findings (via VCDS) match the information in the TSH:

    Customer statement:

    In the driver information system the message: "Reducing agent: system error. No engine start in . . . km! See service wallet." The yellow reducing agent warning lamp also comes on.

    Workshop findings:

    The customer complaint can be reproduced and the following event entry is logged in the engine control unit: P204F00 reducing agent system bank 1 faulty.
    The TSH goes on to tell me that the Technical Background is Incorrect software in the engine control unit and that the technician should:

    Check the SCR system for leaks and the level of the reducing agent ..... repair the vehicle or top up the reducing agent. Check the software version of the engine control unit and if necessary update it .... To reset the message in the instrument cluster with ODIS always perform an inducement journey after the update independently of this TPI (guided test drive for functional check).


    I can see the correct new software version and will be having a chat with my (not so friendly) local Audi dealership and my other friendly (but not so local) Audi dealership to see who can resolve this issue for me without wanting to charge me £1000.

    I will be running the 'at-homes' tests mentioned earlier in this threat at some point this week too, just for complete piece of mind.

    Thanks for all you help this far.

    N.
    Last edited by nickheppleston; 04-08-2020 at 02:34 PM. Reason: Minor spelling corrections

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  10. #7
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    Tonight I managed to run a couple of tests on the Reducing Agent System system. I've included my test output below.

    I was initially worried in the Reducing agent system: current status was reporting COSCR_NOPRESSURECTL , but after running the engine for a few minutes, that changed to COSCR_PRESSURECTL , also my Reducing agent pump: activation went from 0% to 30% to 50%, and Pressure sensor for reducing agent: measured pressure went from -85 hPa to 687 hPa and 4998 hPa, which all seems positive.

    Finally, the Long-term adaptation of reduction agent dosage reported a consistent 1.00, which (according to DrPeter) implies that 'VW/Audi cheating on the tests or SW flash update needed to cheat (Just a joke)' :-)

    I've included my logs below and would appreciate any advice the community may have based on the output contained here. I am completely clueless in this area, but it would appear that the system appears to be working correctly, which makes me think that this is a software problem as mentioned earlier.

    Code:
    Thursday,09,April,2020,13:40:36:26294
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86(VMWare)
    VCDS Version 20.4.0.1  HEX-V2 CB: 0.4508.4
    Data version: 20200331 DS317.0
    www.Ross-Tech.com
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
                    Address 01: Engine  (04L 906 021 FQ)
    
    13:40:27
      IDE03129   Reducing agent pump: activation 0.00 %
      IDE03132   Pressure sensor for reducing agent: measured pressure -85 hPa
      IDE03142   Remaining vehicle distance until reducing agent deficiency 806.10 km
      IDE03143-ENG57549   Remaining engine starts until reducing agent deficiency-Bits 0-7 25 
      IDE03386   Long-term adaptation of reduction agent dosage 1.00 
      IDE05232   Reducing agent fill level 100.00 %
      IDE10032   Reducing agent quality sensor: urea concentration 0.0 %
      IDE11220   Reducing agent system: current status COSCR_NOPRESSURECTL 
      IDE11222   Reducing agent system: current substatus Unknown (255)
      IDE11250   Reducing agent quality sensor: raw temperature value -273.1 °C
    
    --------------------------------------------------------------------------------
    
                    Address 01: Engine  (04L 906 021 FQ)
    
    13:42:06
      IDE03129   Reducing agent pump: activation 0.00 %
      IDE03132   Pressure sensor for reducing agent: measured pressure -85 hPa
      IDE03142   Remaining vehicle distance until reducing agent deficiency 806.10 km
      IDE03143-ENG57549   Remaining engine starts until reducing agent deficiency-Bits 0-7 25 
      IDE03386   Long-term adaptation of reduction agent dosage 1.00 
      IDE05232   Reducing agent fill level 100.00 %
      IDE07081   Reducing agent efficiency-diagnosis progress 2 0.00 g
      IDE07091   NOx untreated emission model value before reducing cat. conv. 51 ppm
      IDE10032   Reducing agent quality sensor: urea concentration 0.0 %
      IDE11220   Reducing agent system: current status COSCR_NOPRESSURECTL 
      IDE11222   Reducing agent system: current substatus Unknown (255)
      IDE11250   Reducing agent quality sensor: raw temperature value -273.1 °C
    
    
    --------------------------------------------------------------------------------
    
                    Address 01: Engine  (04L 906 021 FQ)
    
    13:42:18
      IDE03129   Reducing agent pump: activation 30.00 %
      IDE03132   Pressure sensor for reducing agent: measured pressure 687 hPa
      IDE03142   Remaining vehicle distance until reducing agent deficiency 806.10 km
      IDE03143-ENG57549   Remaining engine starts until reducing agent deficiency-Bits 0-7 25 
      IDE03386   Long-term adaptation of reduction agent dosage 1.00 
      IDE05232   Reducing agent fill level 100.00 %
      IDE07081   Reducing agent efficiency-diagnosis progress 2 0.00 g
      IDE07091   NOx untreated emission model value before reducing cat. conv. 53 ppm
      IDE10032   Reducing agent quality sensor: urea concentration 0.0 %
      IDE11220   Reducing agent system: current status COSCR_PRESSURECTL 
      IDE11222   Reducing agent system: current substatus COSCR_REFILL 
      IDE11250   Reducing agent quality sensor: raw temperature value -273.1 °C
    
    --------------------------------------------------------------------------------
    
                    Address 01: Engine  (04L 906 021 FQ)
    
    13:42:48
      IDE03129   Reducing agent pump: activation 50.00 %
      IDE03132   Pressure sensor for reducing agent: measured pressure 4998 hPa
      IDE03142   Remaining vehicle distance until reducing agent deficiency 806.10 km
      IDE03143-ENG57549   Remaining engine starts until reducing agent deficiency-Bits 0-7 25 
      IDE03386   Long-term adaptation of reduction agent dosage 1.00 
      IDE05232   Reducing agent fill level 100.00 %
      IDE07081   Reducing agent efficiency-diagnosis progress 2 0.00 g
      IDE07091   NOx untreated emission model value before reducing cat. conv. 50 ppm
      IDE10032   Reducing agent quality sensor: urea concentration 0.0 %
      IDE11220   Reducing agent system: current status COSCR_PRESSURECTL 
      IDE11222   Reducing agent system: current substatus COSCR_METERINGCONTROL 
      IDE11250   Reducing agent quality sensor: raw temperature value -273.1 °C
    Cheers, Nick.

  11. #8
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    Hi,

    The value for [Long-term adaptation of reduction agent dosage] displays the current value and a value of "1.00" is the starting point or no adjustment of the amount of AdBlue injected has taken place.

    Think of it like Air/Fuel mixture rations... rich vs. lean. The ECM wants to keep the amount of AdBlue injected at the correct amount and there are 'limits'. When the limits are reached, fault code(s) will set.

    It is strange that your Long Term is at "1.00", one would expect a little adjustment (+/-) ...

    Remember...
    Greater than 1.00 = adding more reducting agent
    and
    Less than 1.00 = taking away reducting agent

    The AdBlue pressure is good, [Pressure sensor for reducing agent: measured pressure] - That should be around 5 bar or 5,000 hpa when the system is active.


    I would agree, before you start taking things apart or replacing things, you should update the ECM.

    There are several Audi and Volkswagen Self Study Programs that are available that explain the AdBlue and diesel engine systems.

    This one is good, 941803 Audi 3.0-liter V6 TDI With Clean Diesel System and with a subscription to erWin, you can also find all the factory repair manuals and wiring diagrams, all available for downloading/printing for later use.


    Again, I hope this helps and learn all that can be learned.. or learn until you become dangerous, then learn some more.. - be safe!

    drpeter

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