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  1. #1
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    B7 2.0 Computer Issues? Short?

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    All,

    First off i'd like to say thank you to everyone who participates in these forums. Threads here have helped me keep my Audi's running smoothly and have saved me money since I bought my first Audi in 2014. A big thank you!

    Currently I am at a loss trying to figure out what's wrong with my car, so i'm coming to you guys for some advice, pointers, whatever you have to offer. I'm having a strange issue and it's a bit hard to explain, so I've also made some videos. Hopefully I can post them here.

    Car Data:

    I have a 2007 Audi A4 Avant 2.0 Turbo / 6 Speed Manual S-line. The car has JHM Stage 3 tuning and the TD05HR turbo. It also has an ignition interlock system installed.

    Brief History:

    Purchased Car in May of last year. installed interlock. Blew Up original Motor in June. Car was previously beat on pretty good (taken to track, etc), so I chalked the failure up to me finishing her off with my lead foot. I Purchaseda used repalcement motor from LKQ and had a reputable Audi/VW shop install the engine. - all good

    Fast forward to October and that motor goes south. I was told by the Audi shop that rocker arm failure caused a valve to drop and ruin the engine.

    Purchased another used motor from Ebay. had same shop install this motor. Shop calls me up and reports they are having an intermittent misfire isolated to cylinder 4 under heavy load. They do their thing trying to troubleshoot the issue:

    swapping coil packs and spark plugs.
    Tried new set of injectors (has S3 injectors for tune)
    Testing the Wiring Harness (which came back good).
    Re-flashing my computer, and also trying a new computer.
    Compression test all cylinders, all over 180.

    They finally call me up and tell me that they have done their best, but cannot figure out why there is a misfire. They said their next course of action would be to dig into the motor, and that it seemed to be something mechanical. It being an Ebay motor, i'm thinking I guess that's possible. I start looking down the RMA route. After consideration, (basically out of cash) I backed out of the RMA route and picked up the car. I figure at least the car runs and I can drive it to work and back and just stay out of boost, and possibly even fix myself.

    Problem:

    It's worth noting here that my car was idling for about 30 minutes before I took off. I was paying the bill, talking to the guys about my issue, etc. I then start my 20mi drive home with the car. While getting on the freeway I get into a bit of boost and feel the misfiring (which i expected based on the statement by the shop), so I keep out of it and try to keep it under ~3k RPM. There's lots of traffic so it's pretty easy to do. What happened next is what I did not expect. About halfway home while stopped in traffic and car idling, the car nearly dies. The tach drops to nearly 0, then immediately spike back up to 1.2K. then settle back down to ~800. The car continues to surge and buck while trying to stay running. it starts off mild, but seems to get worse and worse until it's barely driveable. I was able to baby her into my driveway, but barely.

    So I leave her idling in the driveway for a couple minutes while it seems like the computer is trying to sustain the engine running. The engine finally dies, and i restart, but it dies. OK, push it up into my garage and get a code reader on it. At this time I could not for the life of me get VCDS to connect to my car. I also cannot get Torque connected to my cheap OBD2 reader. Also the car won't start now, just turns over.

    Pulled off the coils, pulled out the plugs and I do a compression test on 4. Plugs all look great, and compression test looks good to me, a few cranks and it's over 180.

    Anyway, I let the car sit for a few hours, plug everything back in and start her up. Starts up fine. I go for a test drive, pulls hard, drives fine. At this point no misfires, seems fixed.

    Upon driving further, car begins to have misfires again.

    I pull back into my driveway and this time I get VCDS connected. I pull the following faults:

    P0300
    P0303
    P0304
    P0353
    P0354

    Based on those I purchase a set of new coil packs.

    Installed coil packs and for the heck of it I swap in a cam position sensor from one of my blown up motors, thinking maybe it's related to that.

    the next test drive is interesting. The car seems fine and fixed again, however I notice now she's pulling less boost, seems to peg at 10 PSI and not ~20PSI (where the JHM Stage 3 Tune calls for). At this point i'm like whatever, i'll deal with it, at least it works. I drove the car up and down the freeway for about 30 minutes, driving hard and normal. Absolutely no misfires whatsoever. I return home and park it. Deemed it fixed (again).

    About an hour later i'm ready to test her again and see if she's truly fixed. Start her up and we're back in misfire city. Car won't stay running. Won't restart. Stuck around the block from my house, pushed her back.

    Now I notice that when the car is surging up and down there's some strange things happening:

    1. With key on and engine not running, I hear the fuel pump kick on and off, over and over. (Just as if you were to turn the key off and on a million times over and over)
    2. I also hear the manifold actuator thingy going nuts, switching back and forth over and over very fast. (Again, as if someone is switching the key off and on very fast)
    3. Runs for less and less time and more roughly each time it gets restarted.
    4. Intermittant connection to ECU (either via VCDS or Torque)
    5. Gauge Cluster temp sensor intermittently reads and doesn't read. (When reads cold, (needle all the way left) and I know car is warm, the car will not start at all) *Noticed that check engine and EPC light flash when the gauge goes south also. Then fan kicks on.

    And then when the car will not start at all, these things are happening:

    1. Fan is running at full blast / Whether car is warmed up or been sitting for a couple hours and is cool to the touch.
    2. I cannot start the car for some time when it gets into this "state". 3-4 hours?
    3. Cannot connect to the ECU (via VCDS or torque)

    At this point it seems to me like a computer issue, but shop is adamant that they have tried a new computer, and that's not it. They also say the wiring harness has been tested with less than 1/10v loss, and so it's surely good.

    I am also no longer getting any engine fault codes.

    The next day my buddy and I are testing the coolant temp sensor (based on fan going full bore), when another buddy who is more familiar with JHM tuning stops by. We connected VCDS and he notices the car is in fact back to stock firmware. ??? How the hell? He eventually gets it back to my JHM Stage 3 tune, but he's confused and i'm really confused.

    Misfires are back under heavy load, but only after 20 or so minutes of driving. Further driving causes car not to idle, further restarts lead it not to start.

    This seeming like an ignition issue, I made an appointment with the interlock folks to have their wiring checked. I had them do their tests this morning, and everything came back good on their end. They also explained to me that they "T" into 3 wires. Ground, ignition, and starter. All connections look good.

    Videos trying to describe issue:

    ECU Connection Issue after Warm - https://www.dropbox.com/s/4f86qopz39...20Wam.MOV?dl=0
    Manifold Actuator Going Nuts when key is on - https://www.dropbox.com/s/z2ayuf4t0m...%20on.MOV?dl=0

    Sorry for the super long winded explanation, but wanted to make sure I could get as much info in here as possible. I will follow up with the results from the full scan as well, just don't have that data handy atm.

    Please let me know what you think, of if there's any further information I can provide.

    Thanks,

    Kyle
    Last edited by Kyodesle; 01-24-2019 at 12:09 AM.

  2. #2
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    Friday,18,January,2019,20:23:10:46862
    VCDS Version: Release 10.6.0
    Data version: 20100630



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


    Chassis Type: 8E - Audi A4 B6/B7
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
    69 75 76 77

    VIN: WAUSF78E37A056340 Mileage: 202250km/125672miles
    -------------------------------------------------------------------------------
    Address 01: Engine Labels: 06F-907-115-AXX.lbl
    Part No SW: 8E1 910 115 G HW: 8E0 907 115 D
    Component: 2.0l R4/4V TFSI 0010
    Revision: 5EH13--- Serial number:
    Coding: 010C010A180F0120
    Shop #: WSC 26110 444 84265
    VCID: 2648F4C6AEBD1B2C

    No fault code found.
    Readiness: 0110 0101

    -------------------------------------------------------------------------------
    Address 03: ABS Brakes Labels: 8E0-910-517.lbl
    Part No SW: 8E0 910 517 J HW: 8E0 614 517 BH
    Component: ESP8 quattro H06 0140
    Revision: 00000000 Serial number: 00000000000000
    Coding: 0004526
    Shop #: WSC 06335 000 00000
    VCID: 2E580CE6864D536C

    5 Faults Found
    01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
    000 - -
    Freeze Frame:
    Fault Status: 01100000
    Fault Priority: 3
    Fault Frequency: 52
    Reset counter: 40
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0000
    Hex Value: 0x4222
    Hex Value: 0x0024
    Hex Value: 0x018F
    Hex Value: 0x0001

    00493 - ESP-Sensor Unit (G419)
    008 - Implausible Signal - Intermittent
    Freeze Frame:
    Fault Status: 00101000
    Fault Priority: 2
    Fault Frequency: 1
    Reset counter: 16
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0200
    Hex Value: 0x4202
    Hex Value: 0x001B
    Hex Value: 0x349F
    Hex Value: 0x0001

    01314 - Engine Control Module
    004 - No Signal/Communication - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 1
    Fault Frequency: 1
    Reset counter: 40
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0400
    Hex Value: 0x4006
    Hex Value: 0x0013
    Hex Value: 0x8597
    Hex Value: 0x0001

    18055 - Check Coding of ECUs on Powertrain Data Bus
    P1647 - 000 - - - Intermittent
    Freeze Frame:
    Fault Status: 00100000
    Fault Priority: 1
    Fault Frequency: 6
    Reset counter: 25
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0000
    Hex Value: 0x4722
    Hex Value: 0x0014
    Hex Value: 0x1092
    Hex Value: 0x0001

    18265 - Load Signal: Error Message from ECU
    P1857 - 000 - - - Intermittent
    Freeze Frame:
    Fault Status: 00100000
    Fault Priority: 2
    Fault Frequency: 8
    Reset counter: 35
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0000
    Hex Value: 0x4222
    Hex Value: 0x0028
    Hex Value: 0x0198
    Hex Value: 0x0001


    -------------------------------------------------------------------------------
    Address 08: Auto HVAC Labels: 8E0-820-043.lbl
    Part No: 8E0 820 043 BM
    Component: A4 Klimaautomat 2833
    Coding: 00000
    Shop #: WSC 00000
    VCID: 6DDACBEA4BCBE874

    4 Faults Found
    00716 - Air recirculation Flap Positioning Motor (V113)
    41-00 - Blocked or No Voltage
    01273 - Fresh Air Blower (V2)
    53-10 - Supply Voltage Too Low - Intermittent
    00532 - Supply Voltage B+
    53-10 - Supply Voltage Too Low - Intermittent
    01206 - Signal for Duration of Ignition Off Time
    27-00 - Implausible Signal

    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. Labels: 8E0-907-279-8EC.lbl
    Part No: 8E0 907 279 N
    Component: int. Lastmodul USA 0907
    Coding: 11023
    Shop #: WSC 65536
    VCID: 3D7A3BAA5B2BB8F4

    1 Fault Found
    00532 - Supply Voltage B+
    53-10 - Supply Voltage Too Low - Intermittent

    -------------------------------------------------------------------------------
    Address 15: Airbags Labels: 8E0-959-655-94.lbl
    Part No SW: 8E0 959 655 H HW: 8E0 959 655 H
    Component: Airbag 9.41 H13 4240
    Revision: 91H13424 Serial number: 0036N0024BLR
    Coding: 0032607
    Shop #: WSC 00000 000 00000
    VCID: 3C7C36AE4031B1FC

    Part No: 8E0 910 339 D
    Component: BF-Gewichtsens. H03 0080

    1 Fault Found
    00532 - Supply Voltage B+
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 2
    Fault Frequency: 3
    Reset counter: 39
    Time Indication: 0


    -------------------------------------------------------------------------------
    Address 16: Steering wheel Labels: 8E0-953-549.lbl
    Part No: 8E0 953 549 Q
    Component: Lenksáulenmodul 0701
    Coding: 04042
    Shop #: WSC 06335
    VCID: 4182475A27D3DC14

    1 Fault Found
    00532 - Supply Voltage B+
    53-10 - Supply Voltage Too Low - Intermittent

    -------------------------------------------------------------------------------
    Address 17: Instruments Labels: 8E0-920-9xx-8EC.lbl
    Part No SW: 8E0 920 982 F HW: 8E0 920 982 F
    Component: KOMBI+WFS 4 H14 0110
    Revision: 0110 Serial number: 00000000000000
    Coding: 0023201
    Shop #: WSC 26154 444 83926
    VCID: 3162179A97734C94

    2 Faults Found
    01314 - Engine Control Module
    004 - No Signal/Communication - Intermittent
    01300 - Control Module for Navigation with CD-Rom (J401)
    004 - No Signal/Communication

    -------------------------------------------------------------------------------
    Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
    Part No: 8E0 959 433 CG
    Component: Komfortgerát T7B 4135
    Coding: 16232
    Shop #: WSC 06335
    VCID: 78F4EABE34895DDC

    Part No: 8E1959801G
    Component: Tőrsteuer.FS BRM 0706

    Part No: 8E1959802G
    Component: Tőrsteuer.BF BRM 0706

    Part No: 8E0959801E
    Component: Tőrsteuer.HL BRM 0606

    Part No: 8E0959802E
    Component: Tőrsteuer.HR BRM 0606

    8 Faults Found
    01330 - Central Control Module for Central Convenience (J393)
    53-10 - Supply Voltage Too Low - Intermittent
    01369 - Alarm triggered by Hood Switch
    35-00 - -
    01371 - Alarm triggered by Door Contact Switch; Driver's Side
    35-00 - -
    00955 - Key 1
    35-10 - - - Intermittent
    01331 - Door Control Module; Driver Side (J386)
    53-10 - Supply Voltage Too Low - Intermittent
    01332 - Door Control Module; Passenger Side (J387)
    53-10 - Supply Voltage Too Low - Intermittent
    01333 - Door Control Module; Rear Left (J388)
    53-10 - Supply Voltage Too Low - Intermittent
    01334 - Door Control Module; Rear Right (J389)
    53-10 - Supply Voltage Too Low - Intermittent

    -------------------------------------------------------------------------------
    Address 55: Xenon Range Labels: 4F0-910-357.lbl
    Part No SW: 4F0 910 357 F HW: 4F0 907 357 F
    Component: AFS 1 H01 0020
    Revision: 00000001 Serial number:
    Coding: 0000019
    Shop #: WSC 06335 000 00000
    VCID: 2952FFFABFA33454

    Part No: 8E0 941 329 A
    Component: AFS-Modul links H03 0010

    Part No: 8E0 941 329 A
    Component: AFS-Modul rechtsH03 0010

    4 Faults Found
    01314 - Engine Control Module
    004 - No Signal/Communication - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 2
    Fault Frequency: 132
    Reset counter: 36
    Time Indication: 0

    02234 - Right Headlight Power Output Stage (J668)
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 2
    Fault Frequency: 2
    Reset counter: 28
    Time Indication: 0

    02233 - Left Headlight Power Output Stage (J667)
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 2
    Fault Frequency: 2
    Reset counter: 27
    Time Indication: 0

    00532 - Supply Voltage B+
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 2
    Fault Frequency: 2
    Reset counter: 27
    Time Indication: 0


    -------------------------------------------------------------------------------
    Address 56: Radio Labels: 8J0-035-1xx-56.clb
    Part No SW: 8E0 035 195 AC HW: 8E0 035 195 AC
    Component: R Symphony2+ H06 0220
    Revision: 00H06000 Serial number: AUZ1Z4F3854556
    Coding: 0310122
    Shop #: WSC 06335 000 00000
    VCID: 68D4BAFE6429CD5C

    4 Faults Found
    01044 - Control Module Incorrectly Coded
    000 - -
    Freeze Frame:
    Fault Status: 01100000
    Fault Priority: 5
    Fault Frequency: 1

    00446 - Function Limitation due to Under-Voltage
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 5
    Fault Frequency: 1
    Reset counter: 53

    00856 - Radio Antenna
    011 - Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00101011
    Fault Priority: 5
    Fault Frequency: 2
    Reset counter: 55

    00821 - Antenna 2 for Radio (R93)
    011 - Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00101011
    Fault Priority: 5
    Fault Frequency: 2
    Reset counter: 55


    -------------------------------------------------------------------------------
    Address 77: Telephone Labels: 8P0-862-335.lbl
    Part No SW: 8P0 862 335 J HW: 8P0 862 335 J
    Component: FSE_255x BT H21 0290
    Revision: 00000001 Serial number: 00000000504921
    Coding: 0011877
    Shop #: WSC 06335 000 00000
    VCID: 3D7A3BAA5B2BB8F4

    1 Fault Found
    00532 - Supply Voltage B+
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 7
    Fault Frequency: 2
    Reset counter: 15


    End ---------------------------------------------------------------------
    Log-WAUSF78E37A056340-202250km-125672mi.txt
    Displaying Log-WAUSF78E37A056340-202250km-125672mi.txt.

  3. #3
    Senior Member Four Rings james12lucy's Avatar
    Join Date
    Jul 04 2015
    AZ Member #
    340494
    My Garage
    North America's only B7 Chump Car. 2006 2.0T A4, fully gutted, custom Loose Stones Racing Roll Cage,
    Location
    Toronto Ontario

    B7 2.0 Computer Issues? Short?

    I had similar issues when trying to adapt an ECU from an early generation B7 to a later generation B7.

    If you have both, you’ll want to check to ensure the ECUs have the same last digit (which will be an M or a B, I believe). 2005.5 and early 2006 B7s had a slightly different CANBUS strategy for the intake runner flap motor and is likely causing your terrible misfire. It would like reset/align when powered off for some time, then not adapt when running.

    It would also cause your intermittent ECU disconnection issues. Since the CANBUS interface is a little different, not all channels would connect. Even if the car was IMMO defeated, it would still cause running issues because it can’t truly be adapted.

    It could also be a bad chassis ground or battery ground. If they’re not grounding out, the ECU won’t have a steady supply of power and will cause disconnections. Also, ensure the battery/alternator are producing enough power to remain connected.

    Lastly, JHM tunes will sometimes reset when you’re having startup issues and you’re cycling the ignition. Easy enough to reprogram with the cruise control stalk. The bigger issue is that you’re trying to run JHM’s stage 3 with 20psi on OEM internals. I mean, the rods are essentially made from cooked spaghetti, and there is no way they’ll hold forever. Especially not, if you’re beating on it. Having said that, JHM runs theirs on OEM internals, but also likely the most well maintained engine you’ll ever see. So, you’ll need to sort out the internals at some point, else you’ll be buying another engine.

    Anyway, that’s all I have for tonight. Start my comparing ECUs and make sure they’re identical. If not, find an ECU with the same part number and adapt it for your needs. Should sort you out ASAP.


    Sent from my iPhone using Tapatalk
    B7 Avant, 6MT, Quattro - Brilliant Black: JHM 93 Octane Stage 2 tune, APR HPFP, S3 Injectors, JHM Test Pipe, Stasis Catback, R8 coils, 034 TIP, Custom CIA, 18" VMR 710, Podi Digital Boost Gauge, RS4 rear sway bar, RS4 grill, Eurojet Billet VC, 42DD catch can, Ohlins SL Coilovers w/ Hyperco springs, OEM Bi-Xenon retrofit, GFB DV+, Brembo 18z.

  4. #4
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    Thank you so much for your reply.

    To my knowledge it's the stock ECU to the car, however the replacement engine (including manifold / flap actuator thingy) did come from a 2009 A4, and my car is a 2007. I do have my previous intake manifold with my original flap motor installed.

    Do you think swapping just the flap motor over would be worth trying?

    About Grounding -

    1. Ground lug right off the battery - Removed, cleaned, re-installed.
    2. The grounding post on the firewall, brown wire before the ECU - seems clean and tight.
    3. The grounding post on the rear passenger side of engine, near the coolant temp sensor.. also seems good.
    4. Each brown wire that goes to a coil pack, all seemed to maintain the same resistance to ground while jiggling the harness around. lol

    Still learning about these cars, so if there's another spot I should check out, let me know.

    About JHM Tune -

    The reset makes sense, I assume that's gotta be what happened in my case.

    Appreciate the tips on the internals too, seems i'll eventually have to do something to fully enjoy this car and make it somewhat reliable.

  5. #5
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    The JHM tuning fiasco is limited to 2005.5 tunes with a B ECU number as far as I’ve been able to figure out.

    If I were you I’d pull that ignition interlock right the fuck out. Most people can’t even get a remote starter for an Audi. I sure as hell wouldn’t want some aftermarket anti theft system screwing with the electrics.

    Return it stock as much as you can.

    A mechanic friend of mine told me that the ECU’s in these cars have some sort of independent ignition module controls in them. Drivers for the coils. I don’t really know how to describe it. Sorry. Maybe your ECU is junk and needs to be replaced and properly coded by the dealer.

    Did you check the basics? ECU and fuel pump relays?
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  6. #6
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    Your p0353 and p0354 codes support my theory that you may have an issue with the coil pack drivers with the ECU.

    It should be pretty easy to figure out. Swap 3 and 4 coils with 1 and 2. If the misfire follows, it’s your coils. Trace the wiring for the coil packs back to the ECU. If your wiring doesn’t check out, that’s your problem.

    If your coils and wiring check out, you probably have bad drivers for the coil and need a new ECU.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  7. #7
    Senior Member Four Rings james12lucy's Avatar
    Join Date
    Jul 04 2015
    AZ Member #
    340494
    My Garage
    North America's only B7 Chump Car. 2006 2.0T A4, fully gutted, custom Loose Stones Racing Roll Cage,
    Location
    Toronto Ontario

    Quote Originally Posted by Kyodesle View Post
    Thank you so much for your reply.

    To my knowledge it's the stock ECU to the car, however the replacement engine (including manifold / flap actuator thingy) did come from a 2009 A4, and my car is a 2007. I do have my previous intake manifold with my original flap motor installed.

    Do you think swapping just the flap motor over would be worth trying?

    About Grounding -

    1. Ground lug right off the battery - Removed, cleaned, re-installed.
    2. The grounding post on the firewall, brown wire before the ECU - seems clean and tight.
    3. The grounding post on the rear passenger side of engine, near the coolant temp sensor.. also seems good.
    4. Each brown wire that goes to a coil pack, all seemed to maintain the same resistance to ground while jiggling the harness around. lol

    Still learning about these cars, so if there's another spot I should check out, let me know.

    About JHM Tune -

    The reset makes sense, I assume that's gotta be what happened in my case.

    Appreciate the tips on the internals too, seems i'll eventually have to do something to fully enjoy this car and make it somewhat reliable.
    I’m going to make the assumption the engine is from a 2008, as the 2009 is the completely different CCTA TFSI.

    Good news on the ground points. One less thing to worry about.

    I agree with evolution; I’d be pulling the interlock. Audi has an immobilizer baked into the car from the factory. Fuel relays make sense. As does checking to see if you’re having LPFP codes. The LPFP controller can’t keep up with the fuel demands of big turbo cars, will overheat, and generally cause intermittent fuel cuts. It’s something else to look at.

    Good luck.


    Sent from my iPhone using Tapatalk
    B7 Avant, 6MT, Quattro - Brilliant Black: JHM 93 Octane Stage 2 tune, APR HPFP, S3 Injectors, JHM Test Pipe, Stasis Catback, R8 coils, 034 TIP, Custom CIA, 18" VMR 710, Podi Digital Boost Gauge, RS4 rear sway bar, RS4 grill, Eurojet Billet VC, 42DD catch can, Ohlins SL Coilovers w/ Hyperco springs, OEM Bi-Xenon retrofit, GFB DV+, Brembo 18z.

  8. #8
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    Fuel cuts would most definitely cause at least one of the many fuel related codes we always see. And I doubt it would cause misfire on only 2 cylinders. He doesn’t seem to have any fuel supply related codes.

    I agree that the fuel system we have in stock form sucks and he could definitely benefit from a low pressure fuel system overhaul in the grand scheme of things but those 2 codes, the malfunction in the coil driver circuits are the 2 codes I’d try to focus on first. I think those 2 codes are the key to figuring this out. Plus, the many codes he is getting in other modules are all electrical/communication and voltage codes. This is most likely an ECU or wiring issue.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  9. #9
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    Unfortunately I have another 7 months on the interlock, as it's DMV imposed. :/

    It does seem to be functioning properly, but i'm with you guys on removing it from the equation, just don't know how I can do that yet.

    After yesterday's appointment at the breathalyzer shop, they explained they tee into 3 wires: Ground, Ignition Power, and Starter Relay. He checked over the connections and said they looked good. I guess there's still a possibility of doing some funk stuff, but it has been this way w/o this problem for 8 months or so.

    I'm not sure if the problem is temperature or time related yet. After yesterdays appointment I let the car sit for 8 hours before going to pick it up. This shop is about 30 miles from my house. I was able to drive back perfectly fine, no misfires, no weird idling issues, but it usually behaves fine on first start up after it's been sitting. I'm actually not sure if it ever goes bad on the same start. I'll keep trying to pay attention to that patter.

    About 30 minutes later I restarted it, and that's when it started doing it's idling thing. I do notice that the Check Engine and EPC lights are flashing when the RPM's dip. Also when the car isn't starting and I see the gauges go up and down, the CEL and EPC lights flash then as well (While engine is not running) so that seems to me like a short?

    Unless this is all a protection mechanism due to the misfires? Could this still be a mechanical issue? i.e. The engine itself?

    https://www.dropbox.com/s/37z1vhgly2...rting.MOV?dl=0

    Would fuel problems cause weird things like that? I'm not sure how to check out the fuel stuff honestly.

    Kyle

  10. #10
    Established Member Two Rings SlvrArrw's Avatar
    Join Date
    Nov 05 2016
    AZ Member #
    384687
    Location
    Richmond, Texas, USA

    Remember all codes are not indicative of a specific problem. Codes are triggered based on signals from sensors sent to ECU.
    Think globally when interpreting codes. The network of sensors will point to the real issue. Continue to isolate and troubleshoot. I would check every connection in the engine bay( the motor has been messed with so many times , who knows if there is a loose one or broken one)
    Seems like you are very patient so keep working at it.

    Sent from my SAMSUNG-SM-G935A using Tapatalk

  11. #11
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    Look at your codes. They tell the story. Focus on those. Get rid of them, see what comes back. Don’t start thinking of “could be”. Focus on what the car is telling you and what you known.

    You know you have misfire codes for 3 and 4. You know you have codes telling you something isn’t right for the ignition circuits on 3 and 4 only. Those 4 codes are related to each other.

    All of your other multiple codes in multiple systems are voltage and communication related. Here’s what you do.

    Clear all of your codes. All of them. Disconnect both battery cables and tie them together so the positive and negative clamps are touching. This will reset EVERY control module in the car. If you have a battery tender, hook it up and trickle charge your battery so you have a full charge. When your battery is charged, hook your cables back up.

    This will make sure all of your low voltage codes aren’t caused by a weak battery and make sure all of your control modules are starting fresh. It will clear all learned behavior. Drive the car and see what codes come back and take it from there.

    Again, work with what you know and what the car is telling you, not what could be.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  12. #12
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    I’m telling you this because chasing fuel related issues when you have zero evidence that there are any is a fools errand.

    A fuel delivery related issue would cause misfires globally, not just limited to those 2 cylinders. Think about it. If the car wasn’t getting fuel, it wouldn’t be limited to just 2. All 4 would have issues because all cylinders get their fuel from the same source. Does that make sense?
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  13. #13
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    EvolutionArmory -Thank you for the tips sir. - I will try the above battery thing when I get home today. - this morning I unlocked her with the key to grab my garage door opener, I then locked using the key. The alarm then went off, and unlocking and re locking the car doesn't seem to disable it. It will disable once I turn the key on tho.. is that normal? Just thought i'd mention it, not sure if it's related.

    When I inspect the wiring harness myself, it all looks like it's in pretty good shape, It's wrapped up in multiple layers. I obviously haven't looked at all of it, but seems easy enough to remove all of it and have a better look. - i'll try getting it all out and having a closer look.

    About the codes:

    I can't seem to get anymore codes, i'm using VCDS > Engine > Fault Codes - lately it's been empty, and then when the car does act up, I can't connect to ECU :/

    Is there another way I can check for codes or get live readings while it's doing it's thing? - like connect to the canbus? Sorry for being a n00b lol

  14. #14
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    If you can’t connect to the ECU to get codes, that isn’t good. Try doing the battery cable thing. It either works and fixes everything under the sun or does jack shit 🤣🤣 There doesn’t seem to be a middle ground.

    Simply visually inspecting your coil pack wires to the ECU probably won’t tell you much. You really need a wiring diagram and a multimeter to properly check to see if the wiring is good.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  15. #15
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    Alright, so I hooked up the computer, went into all the modules I could load up and used the "Clear DTC" button.

    I disconnected the battery, touched the cables together for a few seconds, then put the battery on a charger. Let it charge for about 2 hours, until the charger stopped loading up.

    before reconnecting I touched them together some more.

    Started her up, drove to the gas station and did a full scan (was back to stock tune):

    Thursday,24,January,2019,21:13:36:46862
    VCDS Version: Release 10.6.0
    Data version: 20100630



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


    Chassis Type: 8E - Audi A4 B6/B7
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
    69 75 76 77

    VIN: WAUSF78E37A056340 Mileage: 202360km/125740miles
    -------------------------------------------------------------------------------
    Address 01: Engine Labels: 06F-907-115-AXX.lbl
    Part No SW: 8E1 910 115 G HW: 8E0 907 115 D
    Component: 2.0l R4/4V TFSI 0010
    Revision: 5EH13--- Serial number:
    Coding: 010C010A180F0120
    Shop #: WSC 26110 444 84265
    VCID: 2648F4C6AEBD1B2C

    No fault code found.
    Readiness: 0110 0101

    -------------------------------------------------------------------------------
    Address 03: ABS Brakes Labels: 8E0-910-517.lbl
    Part No SW: 8E0 910 517 J HW: 8E0 614 517 BH
    Component: ESP8 quattro H06 0140
    Revision: 00000000 Serial number: 00000000000000
    Coding: 0004526
    Shop #: WSC 06335 000 00000
    VCID: 2E580CE6864D536C

    1 Fault Found
    01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
    000 - - - Intermittent
    Freeze Frame:
    Fault Status: 00100000
    Fault Priority: 3
    Fault Frequency: 2
    Reset counter: 38
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0000
    Hex Value: 0x4222
    Hex Value: 0x0024
    Hex Value: 0x0193
    Hex Value: 0x0001


    -------------------------------------------------------------------------------
    Address 08: Auto HVAC Labels: 8E0-820-043.lbl
    Part No: 8E0 820 043 BM
    Component: A4 Klimaautomat 2833
    Coding: 00000
    Shop #: WSC 00000
    VCID: 6DDACBEA4BCBE874

    No fault code found.

    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. Labels: 8E0-907-279-8EC.lbl
    Part No: 8E0 907 279 N
    Component: int. Lastmodul USA 0907
    Coding: 11023
    Shop #: WSC 65536
    VCID: 3D7A3BAA5B2BB8F4

    No fault code found.

    -------------------------------------------------------------------------------
    Address 15: Airbags Labels: 8E0-959-655-94.lbl
    Part No SW: 8E0 959 655 H HW: 8E0 959 655 H
    Component: Airbag 9.41 H13 4240
    Revision: 91H13424 Serial number: 0036N0024BLR
    Coding: 0032607
    Shop #: WSC 00000 000 00000
    VCID: 3C7C36AE4031B1FC

    Part No: 8E0 910 339 D
    Component: BF-Gewichtsens. H03 0080

    No fault code found.

    -------------------------------------------------------------------------------
    Address 16: Steering wheel Labels: 8E0-953-549.lbl
    Part No: 8E0 953 549 Q
    Component: Lenksáulenmodul 0701
    Coding: 04042
    Shop #: WSC 06335
    VCID: 4182475A27D3DC14

    No fault code found.

    -------------------------------------------------------------------------------
    Address 17: Instruments Labels: 8E0-920-9xx-8EC.lbl
    Part No SW: 8E0 920 982 F HW: 8E0 920 982 F
    Component: KOMBI+WFS 4 H14 0110
    Revision: 0110 Serial number: 00000000000000
    Coding: 0023201
    Shop #: WSC 26154 444 83926
    VCID: 3162179A97734C94

    1 Fault Found
    01300 - Control Module for Navigation with CD-Rom (J401)
    004 - No Signal/Communication

    -------------------------------------------------------------------------------
    Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
    Part No: 8E0 959 433 CG
    Component: Komfortgerát T7B 4135
    Coding: 16232
    Shop #: WSC 06335
    VCID: 78F4EABE34895DDC

    Part No: 8E1959801G
    Component: Tőrsteuer.FS BRM 0706

    Part No: 8E1959802G
    Component: Tőrsteuer.BF BRM 0706

    Part No: 8E0959801E
    Component: Tőrsteuer.HL BRM 0606

    Part No: 8E0959802E
    Component: Tőrsteuer.HR BRM 0606

    4 Faults Found
    01330 - Central Control Module for Central Convenience (J393)
    53-10 - Supply Voltage Too Low - Intermittent
    01369 - Alarm triggered by Hood Switch
    35-00 - -
    01371 - Alarm triggered by Door Contact Switch; Driver's Side
    35-00 - -
    00955 - Key 1
    35-10 - - - Intermittent

    -------------------------------------------------------------------------------
    Address 55: Xenon Range Labels: 4F0-910-357.lbl
    Part No SW: 4F0 910 357 F HW: 4F0 907 357 F
    Component: AFS 1 H01 0020
    Revision: 00000001 Serial number:
    Coding: 0000019
    Shop #: WSC 06335 000 00000
    VCID: 2952FFFABFA33454

    Part No: 8E0 941 329 A
    Component: AFS-Modul links H03 0010

    Part No: 8E0 941 329 A
    Component: AFS-Modul rechtsH03 0010

    No fault code found.

    -------------------------------------------------------------------------------
    Address 56: Radio Labels: 8J0-035-1xx-56.clb
    Part No SW: 8E0 035 195 AC HW: 8E0 035 195 AC
    Component: R Symphony2+ H06 0220
    Revision: 00H06000 Serial number: AUZ1Z4F3854556
    Coding: 0310122
    Shop #: WSC 06335 000 00000
    VCID: 68D4BAFE6429CD5C

    3 Faults Found
    01044 - Control Module Incorrectly Coded
    000 - -
    Freeze Frame:
    Fault Status: 01100000
    Fault Priority: 5
    Fault Frequency: 1

    00856 - Radio Antenna
    011 - Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00101011
    Fault Priority: 5
    Fault Frequency: 1
    Reset counter: 71

    00821 - Antenna 2 for Radio (R93)
    011 - Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00101011
    Fault Priority: 5
    Fault Frequency: 1
    Reset counter: 71


    -------------------------------------------------------------------------------
    Address 77: Telephone Labels: 8P0-862-335.lbl
    Part No SW: 8P0 862 335 J HW: 8P0 862 335 J
    Component: FSE_255x BT H21 0290
    Revision: 00000001 Serial number: 00000000504921
    Coding: 0011877
    Shop #: WSC 06335 000 00000
    VCID: 3D7A3BAA5B2BB8F4

    1 Fault Found
    00532 - Supply Voltage B+
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 7
    Fault Frequency: 2
    Reset counter: 15


    End ---------------------------------------------------------------------

    After driving around for a bit and letting the car idle, it started with it's behavior. As predicted while it's doing that I can't remain connected. So this morning I did another full scan:

    Friday,25,January,2019,07:41:38:46862
    VCDS Version: Release 10.6.0
    Data version: 20100630



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


    Chassis Type: 8E - Audi A4 B6/B7
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
    69 75 76 77

    VIN: WAUSF78E37A056340 Mileage: 202370km/125746miles
    -------------------------------------------------------------------------------
    Address 01: Engine Labels: 06F-907-115-AXX.lbl
    Part No SW: 8E1 910 115 G HW: 8E0 907 115 D
    Component: T.28 JHM V9A SI 0010
    Revision: 5EH13--- Serial number:
    Coding: 010C010A180F0120
    Shop #: WSC 26110 444 84265
    VCID: 2648F4C6AEBD1B2C

    No fault code found.
    Readiness: 0110 0100

    -------------------------------------------------------------------------------
    Address 03: ABS Brakes Labels: 8E0-910-517.lbl
    Part No SW: 8E0 910 517 J HW: 8E0 614 517 BH
    Component: ESP8 quattro H06 0140
    Revision: 00000000 Serial number: 00000000000000
    Coding: 0004526
    Shop #: WSC 06335 000 00000
    VCID: 2E580CE6864D536C

    2 Faults Found
    01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
    000 - - - Intermittent
    Freeze Frame:
    Fault Status: 00100000
    Fault Priority: 3
    Fault Frequency: 2
    Reset counter: 36
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0000
    Hex Value: 0x4222
    Hex Value: 0x0024
    Hex Value: 0x0193
    Hex Value: 0x0001

    01314 - Engine Control Module
    004 - No Signal/Communication - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 1
    Fault Frequency: 1
    Reset counter: 39
    Time Indication: 0

    Freeze Frame:
    Hex Value: 0x0000
    Hex Value: 0x4022
    Hex Value: 0x0013
    Hex Value: 0x8597
    Hex Value: 0x0001


    -------------------------------------------------------------------------------
    Address 08: Auto HVAC Labels: 8E0-820-043.lbl
    Part No: 8E0 820 043 BM
    Component: A4 Klimaautomat 2833
    Coding: 00000
    Shop #: WSC 00000
    VCID: 6DDACBEA4BCBE874

    No fault code found.

    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. Labels: 8E0-907-279-8EC.lbl
    Part No: 8E0 907 279 N
    Component: int. Lastmodul USA 0907
    Coding: 11023
    Shop #: WSC 65536
    VCID: 3D7A3BAA5B2BB8F4

    No fault code found.

    -------------------------------------------------------------------------------
    Address 15: Airbags Labels: 8E0-959-655-94.lbl
    Part No SW: 8E0 959 655 H HW: 8E0 959 655 H
    Component: Airbag 9.41 H13 4240
    Revision: 91H13424 Serial number: 0036N0024BLR
    Coding: 0032607
    Shop #: WSC 00000 000 00000
    VCID: 3C7C36AE4031B1FC

    Part No: 8E0 910 339 D
    Component: BF-Gewichtsens. H03 0080

    No fault code found.

    -------------------------------------------------------------------------------
    Address 16: Steering wheel Labels: 8E0-953-549.lbl
    Part No: 8E0 953 549 Q
    Component: Lenksáulenmodul 0701
    Coding: 04042
    Shop #: WSC 06335
    VCID: 4182475A27D3DC14

    No fault code found.

    -------------------------------------------------------------------------------
    Address 17: Instruments Labels: 8E0-920-9xx-8EC.lbl
    Part No SW: 8E0 920 982 F HW: 8E0 920 982 F
    Component: KOMBI+WFS 4 H14 0110
    Revision: 0110 Serial number: 00000000000000
    Coding: 0023201
    Shop #: WSC 26154 444 83926
    VCID: 3162179A97734C94

    2 Faults Found
    01314 - Engine Control Module
    004 - No Signal/Communication - Intermittent
    01300 - Control Module for Navigation with CD-Rom (J401)
    004 - No Signal/Communication

    -------------------------------------------------------------------------------
    Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
    Part No: 8E0 959 433 CG
    Component: Komfortgerát T7B 4135
    Coding: 16232
    Shop #: WSC 06335
    VCID: 78F4EABE34895DDC

    Part No: 8E1959801G
    Component: Tőrsteuer.FS BRM 0706

    Part No: 8E1959802G
    Component: Tőrsteuer.BF BRM 0706

    Part No: 8E0959801E
    Component: Tőrsteuer.HL BRM 0606

    Part No: 8E0959802E
    Component: Tőrsteuer.HR BRM 0606

    4 Faults Found
    01330 - Central Control Module for Central Convenience (J393)
    53-10 - Supply Voltage Too Low - Intermittent
    01369 - Alarm triggered by Hood Switch
    35-00 - -
    01371 - Alarm triggered by Door Contact Switch; Driver's Side
    35-00 - -
    00955 - Key 1
    35-10 - - - Intermittent

    -------------------------------------------------------------------------------
    Address 55: Xenon Range Labels: 4F0-910-357.lbl
    Part No SW: 4F0 910 357 F HW: 4F0 907 357 F
    Component: AFS 1 H01 0020
    Revision: 00000001 Serial number:
    Coding: 0000019
    Shop #: WSC 06335 000 00000
    VCID: 2952FFFABFA33454

    Part No: 8E0 941 329 A
    Component: AFS-Modul links H03 0010

    Part No: 8E0 941 329 A
    Component: AFS-Modul rechtsH03 0010

    1 Fault Found
    01314 - Engine Control Module
    004 - No Signal/Communication - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 2
    Fault Frequency: 8
    Reset counter: 37
    Time Indication: 0


    -------------------------------------------------------------------------------
    Address 56: Radio Labels: 8J0-035-1xx-56.clb
    Part No SW: 8E0 035 195 AC HW: 8E0 035 195 AC
    Component: R Symphony2+ H06 0220
    Revision: 00H06000 Serial number: AUZ1Z4F3854556
    Coding: 0310122
    Shop #: WSC 06335 000 00000
    VCID: 68D4BAFE6429CD5C

    3 Faults Found
    01044 - Control Module Incorrectly Coded
    000 - -
    Freeze Frame:
    Fault Status: 01100000
    Fault Priority: 5
    Fault Frequency: 1

    00856 - Radio Antenna
    011 - Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00101011
    Fault Priority: 5
    Fault Frequency: 2
    Reset counter: 73

    00821 - Antenna 2 for Radio (R93)
    011 - Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00101011
    Fault Priority: 5
    Fault Frequency: 2
    Reset counter: 73


    -------------------------------------------------------------------------------
    Address 77: Telephone Labels: 8P0-862-335.lbl
    Part No SW: 8P0 862 335 J HW: 8P0 862 335 J
    Component: FSE_255x BT H21 0290
    Revision: 00000001 Serial number: 00000000504921
    Coding: 0011877
    Shop #: WSC 06335 000 00000
    VCID: 3D7A3BAA5B2BB8F4

    1 Fault Found
    00532 - Supply Voltage B+
    002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 7
    Fault Frequency: 2
    Reset counter: 15


    End ---------------------------------------------------------------------


    Let me know what you think.

    Kyle

  16. #16
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    Any time you see terminal 30 codes, terminal 30 refers to a circuit that should have constant battery power.

    Check grounds, relays and fuses.

    Any water in the car lately?

    Check the wiring around the passenger side foot well. Under the trim in front of the door.

    Check the relay area under the drivers side knee bar and the fuse block at the drivers side door.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  17. #17
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    Make sure your battery ground cable is good. Make sure the wiring to your alternator is good.

    Make sure battery voltage doesn’t drop while at idle. The control modules all freak out when they get less than 10 volts.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  18. #18
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    Computer Section:

    I pulled the computer up and checked the fuses under there - all look good. All harness wires seem tight and plugged in. The ground there looks good, tight and clean.

    As for the relays - there's two big grey relays under the computer that read '614' on them. I notice that when the car tries to correct itself, the relay on the right side (nearer the drivers's seat) clicks each time it recovers. Not sure if this is a reaction or part of the cause, or normal. etc.

    Anyway I tried swapping them to see if anything would change, and still the same.

    Passenger Side Section:

    Pulled this apart, looks OK under there, ground lug also looks good.

    Driver Side Knee Pad:

    This is where the interlock is installed, I checked over these connections and they seem OK.

    I also checked the ECM fuse in the fuse panel, looks good.

    There's some bigger relays up in there, I just made sure they were pushed in tight and felt them for heat.

    I don't believe there's been any water in the car.

    Coil Harness:

    I also pulled most of the harness that goes to ignition coils up, there was a section which had some sheathing that looks sliced into..



    It doesn't seem to bad to me. I covered the bare wire with electrical tape, then wrapped the whole trunk of wires up. Problem is the same.. I guess it's worth replacing tho eh?

    Anyone wanna buy a wagon? :) So frustrated with this car.

    Kyle

  19. #19
    Established Member Four Rings
    Join Date
    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    Electrical problems SUCK!! Lucky for me then but unlucky for me now, our shop Forman took all the electrical gremlin jobs when I was a tech. Shielded us from it so we could make money but now I don’t know know nearly as much about the electrical side as I could.

    It sucks you can’t remove the interlock without getting into trouble. It not being there would eliminate a huge unknown.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  20. #20
    Registered Member One Ring
    Join Date
    Jan 23 2019
    AZ Member #
    445671
    Location
    Salida, CA

    Here's the link to the harness picture: https://www.dropbox.com/s/zlpuzn21dw...rness.jpg?dl=0

    I tried researching that relay I swapped with the "614" on it (#3 in the pic below) and it seems that is the power to the ECU.

    https://www.dropbox.com/s/rwrtwj3bil...TFJ_o.JPG?dl=0

    My guess is that relay should be in constant contact while the key is on.

    Could that still be the coil harness being bad causing it to go bonkers, or is more likely something else upstream of that?

    Can I trace this back with the "terminal 30" code to get something specific to look at? Like one wire or a pin on the ECU?

    I feel like i'm a bit closer to the issue, but not sure what to check next.


    Kyle

  21. #21
    Registered Member One Ring
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    That above schematic showing the relay location may not be what I thought it was.

    Does anyone know what these relays under the ECU are for? I thought fuel pump and ECU, but maybe not?

    https://www.dropbox.com/s/3mp808wuzi...ng_on.MOV?dl=0

    Also, what keeps the right one on? is this even part of the problem?

    Kyle

  22. #22
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    The 2 big relays under the ECU are for the ECU and fuel system. They should have the same number. At least, that is what I’ve always thought too 😀
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

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    Also, Where is the ground from engine to chassis?

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    i think you should stay in stock tune until you can access the situation.

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    interlock sounds like a waste of money and i would gut that out of your car and see if it fixes anything. no use for that, is it anti theft system? nobody wants your 12 year old stationwagon at this point you would wish it was stolen so you can collect on your insurance or maybe set it on fire and collect as much as you can and move on and get ready for your insurance to go thru the roof. gl dude

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    Quote Originally Posted by audia4love3 View Post
    interlock sounds like a waste of money and i would gut that out of your car and see if it fixes anything. no use for that, is it anti theft system? nobody wants your 12 year old stationwagon at this point you would wish it was stolen so you can collect on your insurance or maybe set it on fire and collect as much as you can and move on and get ready for your insurance to go thru the roof. gl dude
    The court that made him install it disagrees with you. I don’t mean to sound insensitive but from what I understand from reading his post, the interlock IS NOT voluntary. 😀 Read his posts again. The interlock being mandatory for a while was already covered.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  27. #27
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    Quote Originally Posted by audia4love3 View Post
    i think you should stay in stock tune until you can access the situation.
    And running the stock tune on a big turbo car doesn’t really help him any either.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  28. #28
    Stage 2 Banner Advertiser Four Rings Chris@EPL's Avatar
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    No one ever wants to have an interlock.
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    Senior Member Four Rings Theiceman's Avatar
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    it just comes down to understanding what an interlock is, put it this way, its not an anti theft device... nough said..
    2014 A4 2.0TQ Technik
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    haha thanks chris, now it makes sense! better finish your deal and get that thing removed asap!

    Quote Originally Posted by Chris@EPL View Post
    No one ever wants to have an interlock.

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    Quote Originally Posted by audia4love3 View Post
    haha thanks chris, now it makes sense! better finish your deal and get that thing removed asap!
    I wish they would install an interlock on you computer hotpants15
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

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    Senior Member Four Rings Theiceman's Avatar
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    Quote Originally Posted by EvolutionArmory View Post
    I wish they would install an interlock on you computer hotpants15
    okay there's something we could all get on board with ... tested for crack before it unlocks, ..we would never hear from him again.
    2014 A4 2.0TQ Technik
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    1978 Porsche 911SC Targa
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    Quote Originally Posted by Theiceman View Post
    okay there's something we could all get on board with ... tested for crack before it unlocks, ..we would never hear from him again.
    Or it could be linked to his Paypal account. As soon as he pays for the turbo he stole, he can log back on 🤣
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  34. #34
    Veteran Member Four Rings A4_PimP's Avatar
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    Quote Originally Posted by EvolutionArmory View Post
    Or it could be linked to his Paypal account. As soon as he pays for the turbo he stole, he can log back on 🤣
    How many useranames can this guy make? I'm losing track of all the names to ignore in threads.

  35. #35
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    No thoughts on what's causing lack of power at that relay? it also runs w/o that relay in place, just runs rough... I would think if it was fuel or computer it would be fairly necessary?

    I can go back to stock tune, that's all fine and dandy. The car just won't run for more than 40 ish minutes at a time. Idling goes to shit, then and the car dies. Will usually restart again until it gets to the point where the fan stays on with they key, and then won't restart at all.

    I thought I had heard that the ECU had a moisture sensor that cut power and turned on the fan when wet? is that true?

  36. #36
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    I don’t know. It’s too bad you can’t just throw in a new ECU to test without having to code the immobilizer.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  37. #37
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    Quote Originally Posted by A4_PimP View Post
    How many useranames can this guy make? I'm losing track of all the names to ignore in threads.
    It’s too bad real life doesn’t work like Audizine.

    No matter how many usernames he makes, he’s still the same piece of garbage.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  38. #38
    Veteran Member Four Rings A4_PimP's Avatar
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    Quote Originally Posted by EvolutionArmory View Post
    It’s too bad real life doesn’t work like Audizine.

    No matter how many usernames he makes, he’s still the same piece of garbage.
    So true it shines right through each new name he creates.

  39. #39
    Established Member Two Rings S4AvantGuy's Avatar
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    The terminal 30 relay distributes power to a lot of systems. I know you swapped relays, but they can have intermittent connection due to flukey contacts. They are cheap - I would replace both relays with new just to be sure.

    There should be a common ground point somewhere near the distribution box. Disconnect the ground(s), clean them, clean the metal and post, and reconnect with some protective grease.

    It COULD be an intermittent connection to the coil of the relay, in which case you will need a good wiring diagram and a lot of time. Or, it could be a flukey relay that is fixed with a $15 part.


    2011 S4 / Stage II EPL + TCU / CAI / B&O / Sport Diff
    2011 S4 | B&O | Sport Diff | IE CAI | EPL Stage II | TCU Tune | AWE Track Exhaust

  40. #40
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    It has to be a short leading up to the coil side, or something further down.. I have my tester jammed up in there reading the voltage. It's definitely going from 12v to 0 sporadically and is not the relay misbehaving.

    Does anyone have any wiring schematics for the Computer / Ignition system? Could be a solder point in the computer itself?

    I also found out that the car does this regardless if it's running or not. i.e. leave key in on position for excess of 40 minutes and the electronics start to go wonky. All the same symptoms. - This may have been obvious to others, but I figured engine heat may have been a factor here. Apparently not.

    I also didn't realize this before, but I can access other modules while the Engine one is not available, or having intermittent connections to it. i.e. I can connect to the immobilizer and confirm it cannot talk to the ECU. - confirming that the intermittent connection is not the cable / computer. The car is actually losing it's engine management, completely.

    Any other suggestions here as far as what further wiring to look at, or how can trace this stuff back?

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