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Thread: Diagnosing fuel pressure problem in Audi Q7 - P2294 code

  1. #21
    NostraJackAss Jack@European_Parts's Avatar
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    Yeah man ......SUB can't get everything for free........
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  2. #22
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    Hi Dana,

    I would like Ross Tech help with a couple things please...going back to the beginning of this thread on how to diagnose the problem.
    - how to measure 1. lift pump PSI and volume. How do I do that with the VCDS? (This is what Jack said to check first.)
    - what Block/Group to see what pressure in Bar the HPFP is putting out? I had read on the Wiki that it was between 25 to over 100 bar.
    Thanks very much.

  3. #23
    NostraJackAss Jack@European_Parts's Avatar
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    Just keep in mind that if sensors report PSI wrong in VCDS...... the only way to double check is with mechanicals and is always highly recommended.

    Keep in mind you have an electrical issue not a FP issue........
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  5. #24
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    It seemed electrical on the autoscan showing 11V...but I think I had pulled over and run the autoscan With the key only in the on position and not running. Maybe the battery was just low then?

    So this am with the OXS reconnected, in Group 003 showed charging over 14V. I also tried to start the car with the fuel pump relay disconnected, and it turned over but wouldn't start. That's why I am asking the Ross Tech guys for exactly which group I can diagnose the HPFP as the problem. You had Saudi. The beginning the high pressure fuel pumps fail often. If I can confirm its the likely problem, then I will inspect it mechanically. Make sense?

  6. #25
    NostraJackAss Jack@European_Parts's Avatar
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    Make sense?
    It makes as much sense as a 10 foot Wookie on planet Endor.

    WTF are you doing pulling relays and tests from the hip.......Time to RTFB WD and pay attention to the stamps in the DTC.


    -------------------------------------------------------------------------------
    Address 01: Engine (BHK) Labels: 03H-906-032-BLV.lbl
    Part No SW: 03H 906 032 DA HW: 03H 906 032 G
    Component: Q7 3.6-FSI-LEV2 G 3234
    Revision: 5CH05--- Serial number:
    Coding: 0001175
    Shop #: WSC 31414 790 00001
    VCID: 64C76CF3A7ABD001EA7-8031

    1 Fault Found:
    008852 - Fuel Pressure Regulator Valve (N276)
    P2294 - 004 - Open Circuit - Intermittent - MIL ON <<<<<<<<<<<<<<<<<<<<< PSSST Open Circuit !
    Freeze Frame:
    Fault Status: 10100100
    Fault Priority: 0
    Fault Frequency: 6
    Reset counter: 255
    Mileage: 108540 km
    Time Indication: 0
    Date: 2015.07.30
    Time: 07:04:22

    Freeze Frame:
    RPM: 690 /min
    Load: 29.0 %
    Speed: 0.0 km/h
    Temperature: 69.0C
    Temperature: 30.0C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.224 V

    Readiness: 0010 0101
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  7. #26
    Ross-Tech Employee DrPeter's Avatar
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    Hi, I am diagnose a fuel pressure problem in 2009 3.6L Gas Audi Q7.
    Like Jack said above, this is an electrical fault so we need to take that approach when attempting to fix this vehicle.


    I would like Ross Tech help with a couple things please...going back to the beginning of this thread on how to diagnose the problem.
    - how to measure 1. lift pump PSI and volume.
    008852 - Fuel Pressure Regulator Valve (N276)
    P2294 - 004 - Open Circuit - Intermittent - MIL ON
    The fault code actually refers to the N290-Fuel Metering Valve , for the BHK engine. So look for this when using the factory wiring diagrams.

    Below is a link to a forum post I made that can be very useful when testing these type of faults, the [Open circuit] one you have.

    Testing - Open Circuits, Short to Ground or Positive, etc....




    How do I do that with the VCDS? (This is what Jack said to check first.) - what Block/Group to see what pressure in Bar the HPFP is putting out?

    - You can use VCDS to see the [Actual] and the [Specified] high side fuel pressure which is controlled by the N290, but these MVBs do not show you voltage at the N290..

    MVB-231 field 2 = Rail Pressure,(specified)
    and field 3 = Rail Pressure,(actual),Tolerance (to specified): 5.0 bar


    - You will need check the voltage to the N290 = Battery voltage (Hint: comes from fuse S13). The other side of the N290 is a pulsed ground controlled by the ECM.

    - This fault code will set if the ECM does not see the minimum voltage passing through the coil of the N290 on the ground side.

    P2294 - Info
    • Signal voltage: 1.40 - 3.20 V = (Open Circuit)
    • Signal pattern incorrect, (Rationality Check)


    N290 - Fuel Metering valve
    - Internal resistance @ 20'C = 1.25 to 1.55 ohms (BKH 3.2L)



    Not all fault codes can or should be diagnosed with the scan tool...



    Hope this helps,

    drpeter


    ps... I thought Wookiee avg height was 2.1 meters

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  9. #27
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    First guys, I am nowhere near Wookie height, not as smart either. Forgive me I would rather chew my arm off than take this to the Audi dealer.

    DrPeter, thanks for the detailed suggestions! I am away and won't get to try these until Friday. Looking forward to it, and will report back.

  10. #28
    Professional User Jetta ,97's Avatar
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    I have seen this in 2.0 T cars and High pressure Pump was bad.
    As DrPeter suggested , check MBV 231
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  11. #29
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    Thanks Jetta.97.
    I will check 231 right when I get back today. Is there a way to inspect the HPFP, if I can remove it from the car? Problem is in the Q7 it is right against the firewall, not easy to access the bolts securing it on the engine.

  12. #30
    NostraJackAss Jack@European_Parts's Avatar
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    Is there a way to be absolutely sure what is causing this problem? I have read that sometimes the HPFP needs to be completely replaced as does the cam follower.
    But I am reluctant to do that without a certain diagnosis, since it will be over $1000 to do.

    I have seen this in 2.0 T cars and High pressure Pump was bad.
    As DrPeter suggested , check MBV 231

    Correct Marin....

    The regulator is part of the HP pump and normally not a spare part....... it is absolutely possible.

    However, I have seen more issues with a cam ramp or follower causing a flutter resonance, this excessive vibration creates an electrical disruption to the N290/N276.

    Now the OP wanted to be sure......
    This is why I would test the harness and ECU via WD, and because these also fail for connectivity issues.

    It only takes time to inspect a cam/lobe ramp/follower and it would be my first check along with mechanical/PSI/volume tests

    PSI checks in VAS/VCDS have proven in worn ranges " unreliable" when needing to know for sure.
    It only reports what it is permitted to see by the ecu's sample rate and thresholds.......many times misleading...especially under loads.

    Manual measurements with a true glycerin gage and volume tests, are the only sure way to know in addition to mechanicals being inspected.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

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