How many CAT ECU do they have in F355 5.2? | FerrariChat
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How many CAT ECU do they have in F355 5.2?

Discussion in '348/355' started by bigbird, Dec 27, 2008.

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  1. bigbird

    bigbird Rookie

    Apr 19, 2008
    18
    #1 bigbird, Dec 27, 2008
    I would like to know some inquiry:
    1. How many CAT ECU they have in F355 5.2?
    2. Where are they located as my knowledge they are only 2, left and right but I have read some posts here they said they also have the CAT ECU for the Y pipe? Where does the CAT ECU Y pipe located?
    3. Picture will be much appreciated.

    Thanks in advance for all of your advise.

    Merry Christmas and Happy new year FOLK!!!

    Kasom C.
     
  2. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Dec 7, 2003
    16,448
    Winston Salem, NC
    #2 Ricambi America, Dec 27, 2008
    Last edited: Dec 27, 2008

    #42, shown here:

    http://www.ricambiamerica.com/parts_catalogs.php?V=diag&I=1450
     
  3. bigbird

    bigbird Rookie

    Apr 19, 2008
    18
    #3 bigbird, Dec 27, 2008
    So that's mean every 355 5.2 has three CAT ECU. Any different in US and Euro version, Is it the same that they have 3 CAT ECU in Euro version also?
    Thanks
     
  4. eric355

    eric355 Formula 3
    Silver Subscribed

    Nov 30, 2005
    1,225
    Toulouse (France)
    Full Name:
    Eric DECOUX
    #4 eric355, Dec 28, 2008
    Euro cars have only 2 cat ECU, one for each cat. The third one, and the associated thermocouple after the exhaust valve, is not installed.
     
  5. Monteman

    Monteman Formula 3
    Rossa Subscribed

    Feb 9, 2006
    2,345
    Santa Barbara, CA
    Full Name:
    Monte
    #5 Monteman, Dec 29, 2008
    Likely a dumb question but how do you tell which one is bad when you get a slow down light?
     
  6. bigbird

    bigbird Rookie

    Apr 19, 2008
    18
    #6 bigbird, Dec 29, 2008
    Thank you so much for all of your comment. I really really don't understand about the system. Because I have read almost of the post and some said they have 2 some said have 3. But now I have been clarified by EARNIE. Thank you so much to him.
     
  7. stv951

    stv951 Rookie

    Jan 9, 2005
    30
    #7 stv951, Jan 13, 2016
    So how can one tell which one goes wrong when slow down light comes on ?
     
  8. phrogs

    phrogs F1 Veteran
    Silver Subscribed

    Apr 13, 2004
    7,346
    Kzoo Michigan
    #8 phrogs, Jan 14, 2016
    You trouble shoot the system. Eliminate the individual.parts, bemch test them. Search funcion is your friend its been covered many times.
     
  9. Ferrari Fanatic

    Ferrari Fanatic Formula 3

    Apr 2, 2003
    1,317
    SoCal
    #9 Ferrari Fanatic, Jan 14, 2016
    Use an OBDII reader plugged in by the steering column. Let's say it shows right bank error, then swap ECU leads and reset CEL. Drive car and wait for CEL to come on again. Scan OBDII again. If it switched banks, per your OBDII scanner then you just identified which ECU is bad.

    Clue......If you look at back of the ECU and the epoxy is cracked that's probably the one.
     
  10. drbob101

    drbob101 F1 Rookie
    Owner Silver Subscribed

    Nov 26, 2012
    3,821
    Tinton Falls, NJ
    Full Name:
    Bob Ferraris
    #10 drbob101, Jan 14, 2016
    Tap the signal output of the Ecu and measure the voltage it is sending to the motronics.

    You will immediately where your problem is and can verify it's been fixed as well.

    Cold voltage should be .5v and rises to around 2.4v when fully warm. Deviations from that in the form of dropped voltages or spikes can trigger the SDL.
     

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