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Thread: Engine Fault - Reduced Power

  1. #26
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Well I would also be worried about the BUS. I do believe that all those sensors are using it to talk to the DDE, so it can be a problem there too.

    Also I would check the battery as it is a known thing for funky codes to pop up for a weak battery. So if the battery test good, clean the connections on the battery.
    Darin
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  2. #27
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    Quote Originally Posted by dworthy View Post
    Well I would also be worried about the BUS. I do believe that all those sensors are using it to talk to the DDE, so it can be a problem there too.

    Also I would check the battery as it is a known thing for funky codes to pop up for a weak battery. So if the battery test good, clean the connections on the battery.
    Any idea where the BUS is located. I could check if it's receiving power etc.

    Also, do you think the DDE relay could have any part to play and where is it located.

    If the DDE was getting no power am I safe to assume it would not be able to talk to the Diagnosis Machine?

    Sent from my Nexus 6 using Tapatalk

  3. #28
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    The BUS is a communication line for the car, all the modules and sensors tend to use it to talk to each other IIRC.

    If the DDE relay was bad, the DDE wouldn't even power up, so you would be correct.

    How does the battery look?
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  4. #29
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    Quote Originally Posted by dworthy View Post
    The BUS is a communication line for the car, all the modules and sensors tend to use it to talk to each other IIRC.

    If the DDE relay was bad, the DDE wouldn't even power up, so you would be correct.

    How does the battery look?
    The battery is fine and so is the alternator.

    I've checked the relay housing and that is bone dry and all connections look clean same with ECU/DDE housing.

    I'm a bit stumped really, where would this BUS be located?

    Sent from my Nexus 6 using Tapatalk

  5. #30
    dworthy's Avatar
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    I am not sure on the F-10 as it is part of the wiring loom in that car.

    I am hoping that one of the dealership techs would jump on this thread, as they play with the newer cars, and I am at the end of my expertise here mate.
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  6. #31
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    Quote Originally Posted by dworthy View Post
    I am not sure on the F-10 as it is part of the wiring loom in that car.

    I am hoping that one of the dealership techs would jump on this thread, as they play with the newer cars, and I am at the end of my expertise here mate.
    Thanks for your help mate.

    I'm a bit stumped now

    Sent from my Nexus 6 using Tapatalk

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