E46 2001 316ti SE Cold Start and Electrical Issues

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  1. E46 2001 316ti SE Cold Start and Electrical Issues 
    #1
    BMW Crazed
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    Tooten's Car Details
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    Hi all.

    I am looking for some assistance with my compact, as it doesn't start on cold mornings.

    The history of the issue is this:

    October 2009: New Fuel pump fitted
    November 2009: Starting issues began, replaced fuel pump relay and engine control relay.
    January 2010: New Battery Fitted

    However the issue still remains, the fuel pump does not kick in when the ignition is turned, however as said, this is only on cold mornings ie frost, on mornings following rain etc, it fires no problem at all.

    I have had the voltages tested and on cold mornings, the voltage to the fuel pump relay is only getting to around 8 to 10 volts instead of 12, any idea what may cause such a drop in voltage?

    Does anyone have any experience of such and issue, or is there anything I need to check out?

    Thanks in advance.
     
     

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    #2
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    It might be worth getting the codes read to see if there is a problem with comms between the EWS module and ECU.
     
     

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    #3
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    Tooten's Car Details
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    Oh, silly me, had the codes read last week and nothing came up!
     
     

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    Dr of BMW gildersol's Avatar
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    Quote Originally Posted by Tooten View Post
    I have had the voltages tested and on cold mornings, the voltage to the fuel pump relay is only getting to around 8 to 10 volts instead of 12, any idea what may cause such a drop in voltage?
    Did you test the voltage yourself. Where exacltly was the reading taken from (across which pins on the relay base).
     
     

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    #5
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    jcjdavis1's Car Details
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    1999
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    Hi. You have 2 posts regarding same problem, helps if you don't have multiple posts. I have replied in other post. Jim
    The older I get the wrong bit gets stiff !!
     
     

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    #6
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    My Dad tested the voltages, can't think what pins he was testing though.

    Apologies for the double post, however due to it being an electrical and also an E46 issue, was covering all bases!
     
     

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