355. Hign idle speed when ac on | FerrariChat
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355. Hign idle speed when ac on

Discussion in '348/355' started by Klas, May 9, 2014.

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  1. Klas

    Klas Formula Junior

    Mar 17, 2014
    364
    Gothenburg, Sweden
    Full Name:
    Klas Nilsson
    #1 Klas, May 9, 2014
    Occasinonally my idle speed is around 1900 rpm when the ac compressor is on and when I turns it off (stop button) it goes down to 1000 rpm. Other times its around 1000rpm with the compressor on. Is this familiar to anyone? What 's then the problem?
     
  2. ready321now

    ready321now Formula Junior

    Jan 5, 2013
    499
    New Jersey
    #2 ready321now, May 9, 2014
    Not that it would be the ultimate solution to whatever is going on....but have you tried an ECU RESET by chance? This SOMETIMES can cure bugs like that. You might get lucky....but there is probably something going on that needs to get investigated more. Good luck. I am sure you will get it sorted out.
     
  3. Klas

    Klas Formula Junior

    Mar 17, 2014
    364
    Gothenburg, Sweden
    Full Name:
    Klas Nilsson
    #3 Klas, May 12, 2014
    Not tried a reset of the ECU. Must be done with special tool by an autherized dlr I presume. Might call my Ferrari workshop/dlr tomorrow.
     
  4. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #4 f355spider, May 12, 2014
    No special tool required. The process is described in the owner's manual. As I have pleaded to you before, please read the owners manual, it will answer many of your questions. ;)
     
  5. Klas

    Klas Formula Junior

    Mar 17, 2014
    364
    Gothenburg, Sweden
    Full Name:
    Klas Nilsson
    #5 Klas, May 13, 2014
    Ok, I have read it several times briefly but then I may take a deeper look into it. Thanx
     
  6. Klas

    Klas Formula Junior

    Mar 17, 2014
    364
    Gothenburg, Sweden
    Full Name:
    Klas Nilsson
    #6 Klas, Sep 20, 2014
    Resetted the ECU several times, also swapped AC control unit with another similar car. No difference unfortunately. It must be a signal fault to the AC CU from thr ECU. Will read out DTC's
     

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