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Thread: Finally Happened! Two Confusing Error Codes!

  1. #1
    Join Date
    Feb 2015
    Location
    Kuna, Idaho
    Posts
    736
    My Cars
    Too Many Cars (NOT!)

    Question Finally Happened! Two Confusing Error Codes!

    Gentlemen (and/or Ladies??);

    Finally decided to thin the herd and sell a car - of course - it decided to give me a bunch of crap on the way out...

    The car: 1997 E39 528i Sedan. Ran the codes in GT1 DIS V44 and - Surprise!!!

    The first one is attached here:
    ASC Fault.pdf
    I'm really hoping this choke valve or whatever it is, isn't inside the ABS/ASC module. If someone could let me know what's up with this thing, it would be much appreciated.

    Second thing is more for verification than anything else, although this one is new and/or confusing to me also verbiage wise anyway:
    DME Faults.pdf
    I'm assuming this is just a matter of replacing the O2 sensors, except the error states it only affects Z3 and 323i US! WTF?

    This car has been a very problem free car with consistent maintenance during my stewardship. Decided to sell it and thought it would be best to run the codes because I didn't want to sell a problem to someone else and low and behold, it decided it didn't want to leave.

    Anyway, if someone can shed a little light on the first one and verify my thoughts on the second I would be eternally grateful.

    Mike
    Mike Drives:
    BMW's
    E24 - 635CSiA - (1) 1985 (US)
    E24 - 635CSi - (1) 1985 (EC)
    E31 - 850iA - (1) 1991 (Black)
    E31 - 850iA - (1) 1991 (Calypso Red)

    E32 - 740iA - (1) 1994
    E32 - 750iA - (1) 1990 (Not an "L") (EC German National)
    E32 - 735iL - (2) 1990
    E32 - 750iL - (1) 1990

    E38 - 740iLA - (2) (1) 1997 & (1) 1998
    E38 - 750iLA - (1) 1998
    E38 - 740iA - (1) 2000 "Short Sport"
    E39 - 528iA - (2) - 2000 & (1) 1997
    Also:
    2015 Ram 3500 Dually, Cumins 6.7, Std.Cab. Long box 4x4 (To haul all this junk when necessary)
    2014 Dodge Dart Rallye (Daily Driver)
    2007 Mercedes Benz CL600 (Brabus SV12S)
    Mercedes Benz SL's - (1) (2002) & (1) 1999 500 - (1) 1999 600
    1967 Buick Riviera (2)

  2. #2
    Jaaap is offline ☀ ☁ ☂ ☃ ☏ ☠ ☢ ☣ ♕ ♫ ✂
    Join Date
    Jun 2008
    Location
    Belgium
    Posts
    887
    My Cars
    Alpina B10 e39 / F3
    "39, servomotor, choke valve"

    The choke valve is in the air intake/inlet.
    It's another butterfly valve that can shut off air to the engine (separate from the throttle valve).
    I think it's operated by vacuum but the word "servomotor" implies an electric motor so idk.
    Check that the bowden cable to the choke is tight and that it can move freely and is not stuck open or closed (move it by hand).
    Check all wires/cables and connectors in that area.

    About the 2nd pdf:
    The for Z3 and 323i it affects cylinders 1-6, for ALL OTHER models it affects cylinders 1-3.
    Last edited by Jaaap; 05-19-2019 at 02:47 PM.

  3. #3
    Join Date
    Oct 2010
    Location
    San Jose, CA
    Posts
    11,537
    My Cars
    1997 BMW 540i 6 speed
    Jaaap is on the right track, except that the servomotor is electric. It will be on the end of the cable that actuates the choke, which lowers power when wheelspin is detected.

    I have no idea where the servo is on an I6.

    How many miles on the pre-cat O2 sensors?

    In CA, you'd have to fix those faults before selling.
    Last edited by edjack; 05-19-2019 at 06:28 PM.


    Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.

  4. #4
    Join Date
    Feb 2015
    Location
    Kuna, Idaho
    Posts
    736
    My Cars
    Too Many Cars (NOT!)
    Ed;
    Even though I'm not in CA anymore (born and raised there), I won't sell a car that's needy (it's a character flaw).

    Ed and Jaaap;
    I did a search in the ETK trying to find "choke" or "servomotor", came up with nothing, so started digging around the throttle diagrams and found a "secondary throttle" outboard of the main throttle body. Can't find anything called a "choke". Knowing the Teutonic penchant for crappy translations, I'm guessing secondary throttle. If anyone can come up with something different, believe me, I'd be grateful. Below is the ETK diagram and parts list for this part. I did notice that the gas pedal is a bit heavy. Seems to take more ankle pressure to move it. Could be a symptom of the error...
    Secondary Throttle.pdf


    As for the O2 sensors, the car has 236K on it and for all I know, they are original (probably not), but have no way of knowing when, if ever they were changed. I rescued this thing from an abusive owner. Based on my cursory examination of where they are, it looks like it's going to be a SUPER HUGE PAIN IN THE A** to change them.

    A side note: Don't think it's related, but may be, I also have a Brake light on the dash. I'm hoping it's part of this "choke" business, but not sure as the "choke" thing came in as an ASC fault.

    Again, thank you all for your help and suggestions. I'm going to pull the airbox and check the brake fluid level, as well as dig around the throttle area and check cables, fuses and wires.

    Thank you,

    Mike
    Mike Drives:
    BMW's
    E24 - 635CSiA - (1) 1985 (US)
    E24 - 635CSi - (1) 1985 (EC)
    E31 - 850iA - (1) 1991 (Black)
    E31 - 850iA - (1) 1991 (Calypso Red)

    E32 - 740iA - (1) 1994
    E32 - 750iA - (1) 1990 (Not an "L") (EC German National)
    E32 - 735iL - (2) 1990
    E32 - 750iL - (1) 1990

    E38 - 740iLA - (2) (1) 1997 & (1) 1998
    E38 - 750iLA - (1) 1998
    E38 - 740iA - (1) 2000 "Short Sport"
    E39 - 528iA - (2) - 2000 & (1) 1997
    Also:
    2015 Ram 3500 Dually, Cumins 6.7, Std.Cab. Long box 4x4 (To haul all this junk when necessary)
    2014 Dodge Dart Rallye (Daily Driver)
    2007 Mercedes Benz CL600 (Brabus SV12S)
    Mercedes Benz SL's - (1) (2002) & (1) 1999 500 - (1) 1999 600
    1967 Buick Riviera (2)

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