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Thread: 2010 Audi Q7 3.0 TDI - P0087

  1. #1
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    2010 Audi Q7 3.0 TDI - P0087

    Hello all,
    I'm hoping you can help me avoid an expensive trip to the repair shop. Huge thanks in advance. Beginning yesterday, the flashing glow-plug light started coming on and putting the Q7 in limp mode. It did this for the first three consecutive trips yesterday morning. It ran fine otherwise during those trips, even though it was in limp mode, limiting me to about 80km/hr. The next three trips later that day, it ran normally, no glow plug light came on at all. One of those trips was to the auto parts store, because I knew that three of the glow plugs were already throwing error codes regularly and I had the same issue with my previous Q7. Then, last night (before I had a chance to install the glow plugs), my wife took it out, and both the check engine and the flashing glow plug light came on, so she returned home and took a different vehicle.

    Today, before even scanning for codes, I took it for a long drive to warm it up, but never drove too fast. The flashing glow plug light eventually came on again, but no check engine light. It ran remarkably smooth and well. I took it home, replaced all six glow plugs, and also, since I was working on it anyway I also replaced the fuel filter.

    The old fuel filter looked very good, the fuel inside the fuel filter canister was remarkably clean, and there was no grime or deposits in the bottom of the canister.

    I ran VCDS to collect a new log and to clear the codes. I didn't pay much attention to the codes that were coming up because the first three codes were all old glow plug codes and I thought this work would clear them. I cleared all the codes, and proceeded to take it out for the verification test drive. Within one block, the flashing glow plug light came back on again (but no check engine light). I ran the codes again, checked with the previous codes before clearing it, and saw that a low fuel pressure failure P0087 appeared in both the before and after. But at least the glow plug errors are gone.

    I've been doing a lot of research, and it seems that there are many possible culprits. Worst case scenario would be the HPFP, but as clean as the fuel filter canister was (I rechecked the filter and don't see any specs of metal at all), it didn't seem as if the HPFP was self-destructing or anything. I removed the pressure control valve from the top of the HPFP because I saw several pictures that showed metal underneath it when an HPFP fails, but it was perfectly clean inside, and surprisingly this valve already has the strainer mounted on it, so another good sign that the HPFP is probably not eating itself as I've seen in so many of the pictures online - but I understand that doesn't mean I can rule it out.

    Other possible culprits would seem to be the high pressure sensor or the fuel pump(s) in the tank. Maybe the fuel pump pressure control valve mounted on the HPFP? I don't know, but I haven't found any other examples of that being the problem.

    How should I approach this diagnostic - without a mechanical fuel pressure gauge?

    Here's the latest scan. Thanks in advance for your help!

    Code:
    Thursday,09,April,2020,17:30:33:49964
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 19.6.2.2 (x64)
    Data version: 20200210 DS308.0
    www.Ross-Tech.com
    
    
    VIN: WAUZZZ4L3AD0#####   License Plate: 
    Mileage: 158560km-98524mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 4L (4F0)
    Scan: 01 02 03 05 08 09 13 15 16 17 18 19 20 28 34 36 3C 42 46 47
              4F 52 55 56 5F 62 69 6C 6D 6F 72 76
    
    VIN: WAUZZZ4L3AD0#####   Mileage: 158560km-98524miles
    
    01-Engine -- Status: Malfunction 0010
    02-Auto Trans -- Status: OK 0000
    03-ABS Brakes -- Status: OK 0000
    04-Steering Angle -- Status: OK 0000
    05-Acc/Start Auth. -- Status: OK 0000
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: OK 0000
    13-Auto Dist. Reg -- Status: OK 0000
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: OK 0000
    18-Aux. Heat -- Status: OK 0000
    19-CAN Gateway -- Status: Malfunction 0010
    20-High Beam Assist. -- Status: OK 0000
    28-HVAC, Rear -- Status: OK 0000
    34-Level Control -- Status: OK 0000
    36-Seat Mem. Drvr -- Status: OK 0000
    3C-Lane Change -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    47-Sound System -- Status: OK 0000
    4F-Centr. Electr. II -- Status: OK 0000
    52-Door Elect, Pass. -- Status: Malfunction 0010
    55-Headlight Range -- Status: OK 0000
    56-Radio -- Status: OK 0000
    5F-Information Electr. -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    69-Trailer -- Status: OK 0000
    6C-Back-up Cam. -- Status: OK 0000
    6D-Trunk Elect. -- Status: OK 0000
    6F-Centr. Conv. II -- Status: OK 0000
    72-Door, Rear Right -- Status: Malfunction 0010
    76-Park Assist -- Status: OK 0000
     
    -------------------------------------------------------------------------------
    Address 01: Engine (CAS)       Labels:. 059-907-401-CAT1.clb
       Part No SW: 4L1 910 401 D    HW: 4L0 907 401 A
       Component: 3.0TDI EDC17A104AG  0080  
       Revision: --H02---    Serial number:               
       Coding: 0121002C191F0A68
       Shop #: WSC 40970 222 94360
       VCID: 2447ED83E718D36FE1-8070
    
    1 Fault Found:
    000135 - Fuel Rail/System Pressure 
                   P0087 - 003 - Too Low
                 Freeze Frame:
                        Fault Status: 01100011
                        Fault Priority: 2
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 158567 km
                        Time Indication: 0
                        Date: 2020.04.09
                        Time: 17:21:32
    
                 Freeze Frame:
                        RPM: 1575 /min
                        Speed: 3.4 km/h
                        Mass Air / Rev.: 36.0 mg/str
                        Temperature: 48.6°C
                        Pressure: 795.2 bar
                        (no units): 5.0
                        Bin. Bits: 00110100
    
    Readiness: 0 0 0 0 0 
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 09D-927-750.clb
       Part No SW: 09D 927 750 KC    HW: 09D 927 750 KC
       Component: AL 750 6A           1470  
       Revision: 00H78000    Serial number:               
       Coding: 0000504
       Shop #: WSC 31414 790 00001
       VCID: 79F9ECF7301A7E87E2-802C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels:. 4L0-910-517-V2.clb
       Part No SW: 4L0 910 517 K    HW: 4L0 614 517 K
       Component: ESP ALLRAD MK25E1   0020  
       Revision: 00H30001    
       Coding: 0627841
       Shop #: WSC 31414 790 00001
       VCID: 326B1BDBADEC4DDF63-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
       Part No SW: 4F0 910 852 B    HW: 4F0 905 852 D
       Component: FBSAUDIC6 ELV   H05 0100  
       Revision: 00H05000    Serial number: 10602601405096
       Coding: 0000135
       Shop #: WSC 31414 790 00001
       VCID: 2541F087EC222A67F6-8070
    
       Subsystem 1 - Part No: 4F0 910 132 G
       Component: FBSAUDIC6 EZS   H03 0020
    
       Subsystem 2 - Part No: 4F0 910 335 B
       Component: FBSAUDIC6 KSG   H03 0020
    
       Subsystem 3 - Part No: 4F0 910 220 K
       Component: FBSAUDIC6 IDG   H01 0040
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels: None
       Part No SW: 4L0 910 043 C    HW: 4L0 820 043 AB
       Component: KLIMA 4 ZONEN H12 0030  
       Revision: 00---017    Serial number: 00000000212367
       Coding: 040816
       Shop #: WSC 31414 790 00001
       VCID: 2447ED832718D36FE1-8070
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
       Part No SW: 4F0 910 279 R    HW: 4F0 907 279 
       Component: ILM Fahrer      H25 0330  
       Revision: 00000000    Serial number: 4F0907279     
       Coding: 0033221
       Shop #: WSC 31414 790 00001
       VCID: 387F29F34B90A78F5D-806C
    
       Subsystem 1 - Part No: 4L1 910 113   Labels: 1KX-955-119.CLB
       Component: Wischer AU716   H17 0100  
       Coding: 00064792
       Shop #: WSC 31414  
    
       Subsystem 2 - Part No: 8K0 910 557   Labels: 8K0-955-559.CLB
       Component: REGENLICHTSENSORH04 0003  
       Coding: 00150059
       Shop #: WSC 31414  
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 13: Auto Dist. Reg        Labels: None
       Part No SW: 4L0 910 561 A    HW: 4L0 907 561 
       Component: ABSTANDSREGELUNGH06 0160  
       Revision: --------    Serial number: 00000000000000
       Coding: 0031161
       Shop #: WSC 31414 790 00001
       VCID: 275DFA8F962E3877C4-8072
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 4L0-910-655.lbl
       Part No SW: 4L0 910 655 D    HW: 4L0 959 655 C
       Component: 70 AIRBAG AUDI8RH43 0230  
       Revision: 04H43000    Serial number: 00399D065B3G  
       Coding: 0014128
       Shop #: WSC 31414 790 00001
       VCID: 2E530FABB9D4693F07-807A
    
       Subsystem 1 - Serial number: 6332QSME623A191AH
    
       Subsystem 2 - Serial number: 6342QSME703A32067
    
       Subsystem 3 - Serial number: 6352QSME4338322CE
    
       Subsystem 4 - Serial number: 6362QSME623A143AH
    
       Subsystem 5 - Serial number: 63734SME3136050EX
    
       Subsystem 6 - Serial number: 63834SME2F364400-
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 4F0-910-549.lbl
       Part No SW: 4F0 910 549 A    HW: 4F0 953 549 D
       Component: J0527               0530  
       Revision: 00H05000    Serial number: 90026092380094
       Coding: 0002052
       Shop #: WSC 31414 790 00001
       VCID: 275DFA8F962E3877C4-8072
    
       Subsystem 1 - Part No: XXXXXXXXXXX 
       Component: E0221           H02 0030
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:. 4L0-920-xxx-17.clb
       Part No SW: 4L0 920 931 J    HW: 4L0 920 931 J
       Component: KOMBIINSTR.   H08 0144  
       Revision: 00000000    Serial number: CNN432799     
       Coding: 0F5E63040C010008000000
       Shop #: WSC 31414 790 00001
       VCID: 326B1BDB6DEC4DDF63-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 18: Aux. Heat        Labels: 4L0-910-105.lbl
       Part No SW: 4L0 910 105     HW: 4L0 265 105 M
       Component: Heizgeraet      H08 0120  
       Revision: 0000000E    Serial number: 00000009014264
       Coding: 0000101
       Shop #: WSC 31414 790 00001
       VCID: 60CFA193B3808F4FC5-8034
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:. 4F0-907-468.clb
       Part No SW: 4F0 907 468 N    HW: 4F0 907 468 G
       Component: GW-BEM 5CAN-M H06 0035  
       Revision: MB200030    Serial number: 3000M098308025
       Coding: 000303
       Shop #: WSC 31414 790 00001
       VCID: 3A7B33FBB59CB59FAB-806E
    
       Subsystem 1 - Part No SW: 8K0 915 181 D    HW: 8K0 915 181 D
       Component: J367-BDM  H07 0107 
       Serial number: 00000000004140159397
    
    1 Fault Found:
    00470 - Company Comfort Databus in Single Wire 
                011 - Open Circuit
                 Freeze Frame:
                        Fault Status: 01101011
                        Fault Priority: 3
                        Fault Frequency: 2
                        Reset counter: 110
                        Mileage: 158567 km
                        Time Indication: 0
                        Date: 2020.04.09
                        Time: 17:03:54
    
                 Freeze Frame:
                        Bin. Bits:    11111
                        Voltage: 14.60 V
                        Count: 7
                        Bin. Bits:    10011
    
    
    -------------------------------------------------------------------------------
    Address 20: High Beam Assist. (J844)       Labels:. 8K0-857-511.clb
       Part No SW: 4F0 857 511 J    HW: 4F0 857 511 G
       Component: FLA           H04 0004  
       Revision: AA001002    
       Coding: 02019064747464545425363E
       Shop #: WSC 31414 790 00001
       VCID: 2F6D12AF7EDE60370C-807A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 28: HVAC, Rear        Labels: None
       Part No SW: 4L0 910 158     HW: 4L0 919 158 AB
       Component: KLIMABETAETIGUNGH06 0060  
       Revision: 00---010    Serial number: 00000000352325
       Coding: 0000006
       Shop #: WSC 31414 790 00001
       VCID: 68DFB9B35BB0F70F0D-803C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 34: Level Control        Labels: 4L0-910-553.lbl
       Part No SW: 4L0 910 553 H    HW: 4L0 907 553 
       Component: LUFTFDR.-CDC    H03 7870  
       Revision: --H03001    Serial number: 15.1528-0123.2
       Coding: 0015520
       Shop #: WSC 31414 790 00001
       VCID: 2F6D12AFBEDE60370C-807A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr (J136)       Labels: None
       Part No SW: 4F0 959 760 C    HW: 4F0 959 760 C
       Component: MEM-FS        H08 0062  
       Revision: AA000000    Serial number: 00001001346979
       Coding: 00581B00000011110000
       Shop #: WSC 31414 790 00001
       VCID: 316914D768EA76C71A-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 3C: Lane Change        Labels: None
       Part No SW: 4L0 910 566 C    HW: 4L0 907 566 B
       Component: J0769_SWA_MasterH01 0040  
       Revision: 00H01000    Serial number: 6PZ 009 014-10
       Coding: 0010101
       Shop #: WSC 31414 790 00001
       VCID: 2E530FABB9D4693F07-807A
    
       Subsystem 1 - Part No: 4L0 910 568 C
       Component: J0770_SWA_Slave_H01 0040
    
       Subsystem 2 - Serial number: 6PZ 009 014-30
    
       Subsystem 3 - Serial number: 5F21.07.0900H010003C910745˙
    
       Subsystem 4 - Serial number: 910745˙
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:. 4F0-959-793.clb
       Part No SW: 4F0 959 793 R    HW: 8K0 959 793 D
       Component: TSG FA        H11 0250  
       Revision:             Serial number: 0000101820752 
       Coding: 011F52205E40440004
       Shop #: WSC 31414 790 00001
       VCID: 4683570BF164C17FDF-8012
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 4L0-910-289.lbl
       Part No SW: 4L0 910 289 H    HW: 4L0 907 289 H
       Component: Komfortgeraet   H09 0100  
       Revision: 0100 ---    Serial number: 01219373360000
       Coding: 3549361
       Shop #: WSC 31414 790 00001
       VCID: 356120C75C825AE746-8060
    
       Subsystem 1 - Part No: 1K0 951 605 C
       Component: LIN BACKUP HORN H03 1301
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 47: Sound System (J525)       Labels: Redir Fail!
       Part No SW: 4L0 035 223 E    HW: 4L0 035 223 E
       Component: BOSE G3 AU716 H01 0100  
       Revision: AH001500    Serial number: 00000000008395
       Coding: 0D000000
       Shop #: WSC 31414 790 00001
       VCID: 2447ED832718D36FE1-8070
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
       Part No SW: 4F0 910 280     HW: 4F0 907 280 E
       Component: ILM Beifahrer   H13 0100  
       Revision:             Serial number: 00000000139275
       Coding: 0011101
       Shop #: WSC 31414 790 00001
       VCID: 5EB39F6B89F4B9BFF7-800A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:. 4F0-959-792.clb
       Part No SW: 4F0 959 792 R    HW: 8K0 959 792 D
       Component: TSG BF        H11 0250  
       Revision:             Serial number: 0000101847220 
       Coding: 011F52205E40440004
       Shop #: WSC 31414 790 00001
       VCID: 45815007CC62CA67D6-8010
    
    1 Fault Found:
    02126 - Central Locking Button; Exterior Door Handle 
                008 - Implausible Signal
                 Freeze Frame:
                        Fault Status: 01101000
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 110
                        Mileage: 158567 km
                        Time Indication: 0
                        Date: 2020.04.09
                        Time: 17:05:00
    
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4F0-910-357.lbl
       Part No SW: 4L0 910 357 A    HW: 4L0 907 357 A
       Component: AFS 1           H01 0030  
       Revision: 00000001    Serial number:               
       Coding: 0000032
       Shop #: WSC 31414 790 00001
       VCID: 2A5B03BB853C051FDB-807E
    
       Subsystem 1 - Part No: 7L6 941 329 A
       Component: AFS-Modul links H07 0004
    
       Subsystem 2 - Part No: 7L6 941 329 A
       Component: AFS-Modul rechtsH07 0004
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio (R)       Labels: Redir Fail!
       Part No SW: 4F0 035 053 K    HW: 4F0 035 053 
       Component: Radio U Basic H45 0074  
       Revision: AB001007    Serial number: 341IZ097634851
       Coding: 010003010000000000
       Shop #: WSC 31414 790 00001
       VCID: 2541F0872C222A67F6-8070
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
       Part No SW: 4L0 035 670 H    HW: 4L0 035 670 
       Component: H-BNT-EU      H41 0187  
       Revision: --------    Serial number: 474I6097515869
       Coding: 010100060004DBEF71000715EF6300030000
       Shop #: WSC 31414 790 00001
       VCID: 2D5108A774D212273E-8078
    
       Subsystem 1 - Part No: 8R0 060 884 ED
       Component: EUR 2017  2402 
    
       Subsystem 2 - Part No SW: 4F0 919 604     HW: 4F0 919 604 
       Component: DU7 High  H43 0306 
       Serial number: 9356IZ091064728     
    
       Subsystem 3 - Part No SW: 4L0 910 609     HW: 4L0 919 611 C
       Component: E0380 Bedient  H05 0060 
       Serial number: 00000001400099      
    
       Subsystem 4 - Part No: 8R0 906 961 A
       Component: CD-Database  1293 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left (J388)       Labels:. 4F0-959-795.clb
       Part No SW: 4F0 959 795 M    HW: 8K0 959 795 B
       Component: TSG HL        H10 0251  
       Revision:             Serial number: 0000101862201 
       Coding: 010E50204040230004
       Shop #: WSC 31414 790 00001
       VCID: 43854E1FC256F457F8-8016
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 69: Trailer (J345)       Labels:. 4E0-907-383.clb
       Part No SW: 4E0 907 383 J    HW: 4E0 907 383 J
       Component: Anhaenger     H09 0100  
       Revision: 2A001001    Serial number: 00008200327685
       Coding: 0100000000000000
       Shop #: WSC 80093 222 69422
       VCID: 316914D768EA76C71A-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6C: Back-up Cam.        Labels: 4L0-910-441.clb
       Part No SW: 4L0 910 441 B    HW: 4L0 907 441 B
       Component: J772__Rearview      0030  
       Revision: --H03---    Serial number: 525PA8-J9940CA
       Coding: 1021001
       Shop #: WSC 31414 790 00001
       VCID: 2541F087EC222A67F6-8070
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6D: Trunk Elect.        Labels: None
       Part No SW: 4L0 910 945     HW: 4L0 827 851 D
       Component: ValeoHeckdeckel H29 0410  
       Revision: --H29001    Serial number: 8K9827852  B  
       Shop #: WSC 98765 666 38354
       VCID: 6CD7C5A34F48DB2F69-8038
    
       Subsystem 1 - Part No: 4L0 910 946 
       Component: ValeoHeckdeckel H29 0410
    
       Subsystem 2 - Serial number: E5030100B     
    
       Subsystem 3 - Serial number: RD16.09.09--H29001001A0322˙
    
       Subsystem 4 - Serial number: 1A0322˙
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6F: Centr. Conv. II        Labels:. 4L0-910-290.lbl
       Part No SW: 4L0 910 290 A    HW: 4L0 907 290 A
       Component: ILM HINTEN 2    H05 0060  
       Revision: AAH05061    Serial number: 003881240-----
       Coding: 0003587
       Shop #: WSC 31414 790 00001
       VCID: 2643F78B9124217FFF-8072
    
       Subsystem 1 - Part No: 4L0 910 591 
       Component: J_245_EE16_SKB09H10 0200
    
       Subsystem 2 - Part No: 4L0 910 591 
       Component: J_394_EE16_SKB09H10 0200
    
       Subsystem 3 - Part No: 4L0 910 591 
       Component: J_392_EE16_SKB09H10 0200
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right (J389)       Labels:. 4F0-959-795.clb
       Part No SW: 4F0 959 795 M    HW: 8K0 959 795 B
       Component: TSG HR        H10 0251  
       Revision:             Serial number: 0000101862200 
       Coding: 010E50204040230004
       Shop #: WSC 31414 790 00001
       VCID: 43854E1FC256F457F8-8016
    
    1 Fault Found:
    02126 - Central Locking Button; Exterior Door Handle 
                008 - Implausible Signal
                 Freeze Frame:
                        Fault Status: 01101000
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 110
                        Mileage: 158567 km
                        Time Indication: 0
                        Date: 2020.04.09
                        Time: 17:06:36
    
    
    -------------------------------------------------------------------------------
    Address 76: Park Assist        Labels: 4Fx-910-283.lbl
       Part No SW: 4L0 910 283 E    HW: 4L0 919 283 E
       Component: Parkhilfe 8-Kan H02 0100  
       Revision: 00H02000    Serial number: 85130925303084
       Coding: 0231166
       Shop #: WSC 31414 790 00001
       VCID: 2C5705A38FC81B2F29-8078
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 03:50)--------------------------
    ---------------------------------------
    Johnathon M. Jones
    2010 Audi Q7 TDI

  2. #2
    Benevolent Dictator Uwe's Avatar
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    I guess I would try to see what's going on in MVB Group 020, where you should find:
    Engine Speed
    Specified Pressure
    Actual Pressure
    Pressure Control Valve duty cycle

    MVBs 018, 019, and 021 all have pressure-related info as well.

    There are also some tips here:
    http://wiki.ross-tech.com/wiki/index...1/P0087/000135

    -Uwe-
    Lock-down of sick people: Quarantine
    Lock-down of healthy people: Tyranny

  3. Likes Jack@European_Parts, jmjq7tdi liked this post
  4. #3
    Verified VCDS User
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    I've taken a brief look at the pressures in those MVB's, but not while driving around, just idling and revving the engine. In those cases, the specified pressure and actual pressure were always in sync. How should I go about getting useful information from these? I saw another post about low fuel pressure where he did some type of logging in VCDS, but I haven't tried that yet. Do I need to start logging and drive around?
    ---------------------------------------
    Johnathon M. Jones
    2010 Audi Q7 TDI

  5. #4
    NostraJackAss Jack@European_Parts's Avatar
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    How should I approach this diagnostic - without a mechanical fuel pressure gauge?

    Did you know you should not attempt such an approach with exception of rail isolation caps & while logging with VCDS to manage injector zones for comparison of actual PSI reported or a fuel filter changed?

    RTFB should be observed for safe testing procedures fuel system and mechanicals cross referenced to log data.
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    That's what I'm concerned about - not being able to do much without any mechanical testing tools. I saw another post of yours where you posted a pic of these isolation caps. I don't even have a mechanical gauge for these kinds of pressures, so if it gets to a point where the diagnostics require that, I'm going to have to take it in to a shop. I'm hoping we can collect enough clues to narrow down the culprit.
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    Johnathon M. Jones
    2010 Audi Q7 TDI

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    Did you know caps can be installed and PSI compared in logs of rail and if DTC goes away for PSI after cleared and PSI jumps up, than you know that's the respective problem injector like leaking down now don't you?
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    Quote Originally Posted by jmjq7tdi View Post
    I've taken a brief look at the pressures in those MVB's, but not while driving around, just idling and revving the engine. In those cases, the specified pressure and actual pressure were always in sync. How should I go about getting useful information from these? I saw another post about low fuel pressure where he did some type of logging in VCDS, but I haven't tried that yet. Do I need to start logging and drive around?
    I suspect so. No-load conditions simply don't use much fuel.

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    Quote Originally Posted by Jack@European_Parts View Post
    Did you know caps can be installed and PSI compared in logs of rail and if DTC goes away for PSI after cleared and PSI jumps up, than you know that's the respective problem injector like leaking down now don't you?
    Okay, I hear you. We need to add the possibility of a leaky injector to the list of potential problems. Short of capping-off the supply lines for injectors, is there another way to determine if 'any' of the injectors are leaking? Since it's CR, if just one is leaking, the entire system should depressurize, right? I saw a diagnostic test where you monitor fuel pressure in VCDS after engine cutoff, and due to heat soak, it should theoretically rise a little bit. Would that same type of test apply to the 3.0 TDI?

    Also, if I had an injector that was leaking that badly, i.e. exhibiting low fuel pressure by 2k RPM's, wouldn't I see smoke out of one side from the extra fuel? At least a little bit?

    If 'any' of the injectors are leaking, is there any value in determining exactly which one, i.e. is it okay to only replace a single injector in a car with 98k miles and leave the rest alone, or should they all be removed and sent off?

    About to head out now to start logging fuel pressures.
    ---------------------------------------
    Johnathon M. Jones
    2010 Audi Q7 TDI

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    When starting it this morning for the first time, it seemed to have to crank over longer than unusual, maybe 5-6 seconds instead of the normal ~2 seconds of cranking before start. Every start after that, it starts right up. There was a slight hint of smoke from the right side exhaust of the car, but it was very, very light, probably just morning condensation burning off. It really didn't seem to be excess fuel.

    So, I drove around for a while and logged 018, 019 and 020. Here's the logging info for MVB 020 at the specific point of failure. Not too surprising. When RPM's start to rise above 2000, fuel pressure can't keep up. At over 2500, the computer catches it and puts it in limp mode.

    https://www.dropbox.com/s/tu2w632um9...dData.jpg?dl=0

    Here's the graph for the entire drive. It seems that the fuel pressure generally keeps up with all demands except when RPM's go above 2000, or fuel pressure above 1250 bar.
    https://www.dropbox.com/s/16j83maqcp...Drive.jpg?dl=0
    Last edited by jmjq7tdi; 04-10-2020 at 05:52 AM.
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    Johnathon M. Jones
    2010 Audi Q7 TDI

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    Ross-Tech Employee Dana's Avatar
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    Using the gas Fuel Rail Pressure Test testing/logging method can be applied to a TDI however the failed part would need to be bad enough that you saw a complete leakdown under key on, engine off conditions. Since yours runs and just can't keep up under high RPM I'm not sure it will reveal problems. If this was a no-start or constant long-crank on startup that would be easier to spot.

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