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BMW E90 320d Cooling Fan Constantly on

  • 26-08-2011 7:59pm
    #1
    joshlismore
    Registered Users, Registered Users 2 Posts: 45 ✭


    Hi

    just got my E90 back from the garage today after 7 weeks, had to get the ecu repaired, apparently it just melted! the mechanic told me she's running sweet as a nut but that the fan comes on after starting and stays running until you stop the car again.

    the mechanic told me it was a problem with the fan and that if i replace it, that'll fix it. i find that hard to believe though as surely the car controls the power going to the fan.

    anyone have a similar problem? is it the fan?

    the fault code on the dash is cc-id 206

    any advice be great


Comments

  • #2
    heate
    Closed Accounts Posts: 499 ✭✭heate


    the fan is activated by a thermostat so maybe start with that? I assume you've no engine temp sensor in the E90?


  • #3
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    The fan on an e90 is ecu controlled so there may still be some issue.

    Is he sure the AC isn't on? The fan will be running if the AC is on.


  • #4
    joshlismore
    Registered Users, Registered Users 2 Posts: 45 ✭joshlismore


    Nissan doctor wrote: »
    The fan on an e90 is ecu controlled so there may still be some issue.

    Is he sure the AC isn't on? The fan will be running if the AC is on.

    well there is no cold air coming into the car that make me think the air con is on. is there any check i can do?


  • #5
    joshlismore
    Registered Users, Registered Users 2 Posts: 45 ✭joshlismore


    heate wrote: »
    the fan is activated by a thermostat so maybe start with that? I assume you've no engine temp sensor in the E90?

    correct, there is no temp display on the dash. bit of a balls after giving them 800e and its still not right!


  • #6
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    The first thing your mechanic should be doing is reading the recorded coolant temperature from the ecu using diagnostic equipment. He can then determine if the ecu is getting the correct temperature signal and is giving out the correct signal to the fan.


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  • #7
    joshlismore
    Registered Users, Registered Users 2 Posts: 45 ✭joshlismore


    Nissan doctor wrote: »
    The first thing your mechanic should be doing is reading the recorded coolant temperature from the ecu using diagnostic equipment. He can then determine if the ecu is getting the correct temperature signal and is giving out the correct signal to the fan.

    i ask him when i collected it and he said that the ecu wasn't showing any error and it was reading the correct temp. the ecu that got repaired was the one for the injection system. he said there is 2 of them, one for cylinders 1 and 4 and another for 2 and 3. so i don't think that the ecu repaired is related to this problem as there is probably another system for controlling the fan, but i could be wrong on this


  • #8
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    joshlismore wrote: »
    i ask him when i collected it and he said that the ecu wasn't showing any error and it was reading the correct temp. the ecu that got repaired was the one for the injection system. he said there is 2 of them, one for cylinders 1 and 4 and another for 2 and 3. so i don't think that the ecu repaired is related to this problem as there is probably another system for controlling the fan, but i could be wrong on this

    A car only has one main ecu and, on modern cars, all engine systems run through it.

    It would be interesting to know what has actually been replaced on your car to know if the fan issue could be related.


  • #9
    joshlismore
    Registered Users, Registered Users 2 Posts: 45 ✭joshlismore


    Nissan doctor wrote: »
    A car only has one main ecu and, on modern cars, all engine systems run through it.

    It would be interesting to know what has actually been replaced on your car to know if the fan issue could be related.

    looks like i'll be bringing it back to him so. might as well get value for money


  • #10
    dharn
    Registered Users, Registered Users 2 Posts: 2,574 ✭✭✭dharn


    sounds like your mechanic does not know what he is talking about


  • #11
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    I presume there is some sort of variable speed fan like the e46 with a controller on the fan itself. I'd imagine if the fan can't see the main ecu it will fail safe and continue to run once power is applied. Could be a loose connection to the fan controller.

    If he has decent diag equipment he should be able to see what speed the fan is being requested to spin at, if at all...


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  • #12
    joshlismore
    Registered Users, Registered Users 2 Posts: 45 ✭joshlismore


    DublinDilbert wrote: »
    I presume there is some sort of variable speed fan like the e46 with a controller on the fan itself. I'd imagine if the fan can't see the main ecu it will fail safe and continue to run once power is applied. Could be a loose connection to the fan controller.

    If he has decent diag equipment he should be able to see what speed the fan is being requested to spin at, if at all...


    Diesel injection services in cashel had the ecu repaired by a third party. i'm told they are very good at what they do. looks like i'm going to have to bring it back to him. the fan wasn't running like this before the ecu went so it has to be related.


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