Car parked for 2 years, slow down light, awesome :( | FerrariChat
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Car parked for 2 years, slow down light, awesome :(

Discussion in '348/355' started by Redlyne_mr2, Apr 28, 2016.

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  1. Redlyne_mr2

    Redlyne_mr2 Formula Junior

    Aug 5, 2009
    472
    Calgary, Alberta
    Full Name:
    Ryan D
    #1 Redlyne_mr2, Apr 28, 2016
    Last edited: Apr 28, 2016
    I barely drove my over the last couple of years, I started the car up today and the slowdown light is on, not flashing. I've heard this could be a cat ecu or thermocoupler. Is that correct? Should I start doing the trial and error, unplug ecu, switch sides etc?

    EDIT - Sorry gents I should have read a few threads down, seems to be common, looks like a bad tcu, i'll start there.
     
  2. rob.kruiswijk

    rob.kruiswijk Formula 3

    Jun 15, 2014
    1,693
    Netherlands
    Full Name:
    Rob
    #2 rob.kruiswijk, Apr 29, 2016
    Just swap the cat ecu with each other (left and right) and check if the slowdown ligh of the other cylinder bank lights on, if this is the case you have a broken cat ecu. Br Rob
     
  3. drbob101

    drbob101 F1 Rookie
    Owner Silver Subscribed

    Nov 26, 2012
    3,821
    Tinton Falls, NJ
    Full Name:
    Bob Ferraris
    #3 drbob101, Apr 29, 2016
    Do you have a OBD reader and do you know how to run a
    Code scan?

    Do you have a CEL?
     
  4. tr512

    tr512 Formula 3

    Apr 12, 2007
    1,600
    canada burnaby bc
    Full Name:
    Michael
    #4 tr512, Apr 29, 2016
    His profile says he has a 98/355 they only have one SDL on the dash.
     
  5. emac

    emac Formula Junior
    Silver Subscribed

    Sep 14, 2014
    851
    upstate SC
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    ernest
    #5 emac, Apr 29, 2016
    Last edited by a moderator: Sep 7, 2017
    Check all the connections. Get a code reader. Your code may be pending, and not setting off the CEL, but I am pretty sure you get different codes for L & R banks, and bypass with the SDL. It has been a while since I tackled that issue, and with the help of Dr Bob and the forum I got it worked out.

    Added OBD2 code list
    Image Unavailable, Please Login
     
  6. tr512

    tr512 Formula 3

    Apr 12, 2007
    1,600
    canada burnaby bc
    Full Name:
    Michael
    #6 tr512, Apr 30, 2016
    po1445 pass side ecu
    po1449 drivers side ecu
    po 1448 bypass valve
     
  7. Dave rocks

    Dave rocks F1 World Champ
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    Nov 23, 2012
    16,047
    Orchard Park, NY
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    Dave Lelonek
    #7 Dave rocks, Apr 30, 2016
    Take the zeros out but yes Mike, you are correct:)
     
  8. tr512

    tr512 Formula 3

    Apr 12, 2007
    1,600
    canada burnaby bc
    Full Name:
    Michael
    #8 tr512, Apr 30, 2016
    I think your right..as you get older you don't remember the same.I'm shocked i still remember the code's and what they mean..lol
     
  9. Redlyne_mr2

    Redlyne_mr2 Formula Junior

    Aug 5, 2009
    472
    Calgary, Alberta
    Full Name:
    Ryan D
    #9 Redlyne_mr2, May 9, 2016
    ok here are the codes I go

    p0432 catalyst 2 efficiency below threshold bank 2 (I have exhaust and test pipes, I think this code is because of that )

    p1448 - Bypass valve (I have a capristo bypass valve), is there a bypass valve ecu?

    p1449 - driver side ecu (does this mean if I replace the cat ecu were good to go? )

    p1445 - pass ecu

    Soooo.. do these codes mean all my cat ecu's are shot or do I need to eliminate them? Could I have screwed these by having the car boosted?

    thanks
     
  10. drbob101

    drbob101 F1 Rookie
    Owner Silver Subscribed

    Nov 26, 2012
    3,821
    Tinton Falls, NJ
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    Bob Ferraris
    #10 drbob101, May 9, 2016
    Ryan,

    You say you have exhaust and test pipes. What do you mean? Are all of the sdecu (3 of them) and thermocouples (3 of them) installed?

    There is one for each side catalyst or in your case test pipe and one after the bypass valve. There are bungs or were originally for three thermocouples. One on each cat and one on the muffler after the bypass valve.

    If you're going to trouble shoot this yourself, have a look at exactly what you have installed in your car and the status of it. Are all 6 components there and are all connectors plugged into each sdecu? Are all 3 thermocouples there snd are they plugged into the sdecu and are they secured into their respective bungs?

    From there I'll try and walk you through some troubleshooting.

    Is the light flashing or solid? Does it come on from cold start? Flashing or solid?
     
  11. Redlyne_mr2

    Redlyne_mr2 Formula Junior

    Aug 5, 2009
    472
    Calgary, Alberta
    Full Name:
    Ryan D
    #11 Redlyne_mr2, May 10, 2016
    Thanks for the help bob. I have tubi exhaust with fabspeed test pipes, all thermocouples seem to be connected. The sdl light comes on flashing at cold starts .
     
  12. drbob101

    drbob101 F1 Rookie
    Owner Silver Subscribed

    Nov 26, 2012
    3,821
    Tinton Falls, NJ
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    Bob Ferraris
    #12 drbob101, May 10, 2016
    With codes on every sdecu, you've got some troubleshooting to do.

    Check your pm Ryan
     
  13. Redlyne_mr2

    Redlyne_mr2 Formula Junior

    Aug 5, 2009
    472
    Calgary, Alberta
    Full Name:
    Ryan D
    #13 Redlyne_mr2, May 16, 2016
    Drbob, has been hugely helpful, thank you. I checked voltage on the signal wire, all seems to be fine. I cleared the codes, drove the car, parked it. Drove it again, parked it. no codes. I triple checked all the connections, everything seems fine. I even bought a cat ecu so I have a new one in the event I need it. No sdls anymore, the car sort of fixed itself, very strange.
     

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