1995 E36 M3 - Fuel gauge and speedo woes - Page 2

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Thread: 1995 E36 M3 - Fuel gauge and speedo woes

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  1.  
    #11
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    xXxStKxXx's Car Details
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    Its quite easy to check these things yourself The loom in the boot is very easy but to check under the front seat though may be a little bit more challenging...Certainly wont cost you money though
     
     

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    nanimtalisi (11-08-2011)

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  4.  
    #12
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    nanimtalisi's Car Details
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    bmw m3 e36 vert
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    1995
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    Do you know of any good mechanic as im scared of ruining it more ?
     
     

  5.  
    #13
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    joylove's Car Details
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    No point putting it on the diagnostic scanner, it won't detect a bad ground, frayed wires or water damage.

    There is little more that can be done on the scanner than a cluster test, which can be done by an amatuer.

    1) Cluster test
    2) Boot lid wiring
    3) water damage search under carpets
    4) Fuel pump wiring under back seat
    5) pull the cluster and test the grounds on the connector for resistance to a known good ground

    EDIT: You seem to be panicking so I went into the schematic for you, available in PDF form via a Google search.

    At the cluster (Page 6211.0) the speed sensor and fuel level sensor are on a 12 pin connector X271. It has only three cables (BR/GE, BR/SW, BR/RT).

    X271
    Pin Type Description/Function Connection
    1 A Fuel level sensor Fuel tank sensors
    2 Not used
    3 A Ground supply for fuel tank sensors and
    vehicle speed sensor
    Fuel tank sensors and vehicle speed
    sensor
    4 E Position signal TW Vehicle speed sensor
    5 Not used
    6 Not used
    7 Not used
    8 Not used
    9 Not used
    10 Not used
    11 Not used
    12 Not used

    The cables go in a loop, the ground is made through the cluster.

    Pin 3 (Brown/Black) is the ground for the two guages. Check at pin X271.3 for a good ground to a known good GND. If there is a high resistance to GND then the cluster is at fault or the cable is damaged or shorted.

    Tests: With the engine off, measure the resistance to GND at pin X271.3. expect zero Ohms. Check for connectivity X17.3 as this is a master GND. See schematic page 6211.0-04 for details.

    Where


    RT Red
    SW Black
    GN Green
    BR Brown
    GE Yellow
    WS White
    VI Violet
    GR Grey
    BL Blue
     
     

  6. The Following 3 Users Say Thank You to joylove For This Useful Post:

    bratty (12-08-2011),nanimtalisi (11-08-2011),steve23002 (11-08-2011)

  7.  
    #14
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    xXxStKxXx's Car Details
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    Quote Originally Posted by nanimtalisi View Post
    Do you know of any good mechanic as im scared of ruining it more ?
    You could try asking Steve23002.He is in Oxford somewhere and is a very good mechanic.He is very busy though cause good mech's are hard to find but always does his best to help out
     
     

  8. The Following User Says Thank You to xXxStKxXx For This Useful Post:

    nanimtalisi (11-08-2011)

  9.  
    #15
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    nanimtalisi's Car Details
    Model of Car:
    bmw m3 e36 vert
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    thanks for the suggestions i have now taken the car to biecester auo electrics and wait with baited breath as abs light has come on too !
     
     

  10.  
    #16
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    nanimtalisi's Car Details
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    convertible

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    hi guys thanks to all for the ideas will make sure all is tried , i love my m3 i'm actually gutted and thinking of selling it due to this issue it's bugging me a lot and costing me trying to find help !
    i will take all suggestions to garage tomorrow and hope mechanic can have a crack at it .
     
     

  11.  
    #17
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    nanimtalisi's Car Details
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    guys i'm getting nowhere now thinking of putting my m power on ebay gutted . its funny because this is a well documented issue but its elusive !
     
     

  12.  
    #18
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    nanimtalisi's Car Details
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    help
    somebody cmon guys i need that m my car is lovely i don't want to let go but can't keep it if im not sure of fuel level and speed ! it would have to be ebayed ! mere thought of some guy owning it kills me .
     
     

  13.  
    #19
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    nanimtalisi's Car Details
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    good news guys the car is fixed a few hundred pounds later and it was not even a fault ! one of the conectors the little black one was not put on by the bogus mechanic ! bmw dealer did not even notice this too yet they hed the car for 3.5 hrs ! i almost sold it but im'm happy now the connector had now fallen and was in by the pedals !thanks for the input much appreciated .
     
     

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