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Discussion in '456/550/575' started by hwyman, Apr 18, 2020.

  1. hwyman

    hwyman Formula Junior

    Jun 25, 2015
    255
    Canada / Los Angeles
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  3. bruzzifumi

    bruzzifumi Rookie

    Mar 27, 2015
    37
    #2 bruzzifumi, Apr 19, 2020
    Last edited: Apr 19, 2020
    Hi, it looks as the 2 ECUs that monitorize the temperature of the catalyzers (and eventually turn on the "slow down" warning light...) has been jumped.
    These ECUs are a pretty common fault of our cars, there are many threads about "slow down" warning light.
    If your car is running without cats, that is not an issue at all, but if you do have cats, I'd fit new ECUs, which are not that expensive after all...
     
  4. bruzzifumi

    bruzzifumi Rookie

    Mar 27, 2015
    37
    Sorry...silly me:(! Forget what I wrote...that is NOT the cat ecu plug... No Idea what it's for, but on my 1997 Europen 550 it is "jumped" with an original cable, with no visible resistance through it...
     
  5. Qavion

    Qavion F1 Rookie
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    Feb 20, 2015
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    Is that a resistor in the jumper wire? If the colour code is brown-red-brown-gold (120 ohms), it may have something to do with the right bank engine ECU to left bank engine ECU datalink.

    It's shown in the wiring diagrams...

    See equipment number 152

    Ferrari_550_Right_Bank(1~6)_Injection

    At first I thought it might be a jumper for daylight running lights, but that has different coloured wires.
     
  6. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Does your 550 have Canada daytime running lamps?
     
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  8. hwyman

    hwyman Formula Junior

    Jun 25, 2015
    255
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    It does have daytime running lights. Odd it comes out of the black box under the windshield along with a few other larger insulated cables
     
  9. ixlr8

    ixlr8 Karting

    Aug 24, 2015
    238
    Mid-Coast Maine
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    Jim
    The daytime running lights jumper for my 550 is next to the fuse box in the right side foot well.
     
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  10. hwyman

    hwyman Formula Junior

    Jun 25, 2015
    255
    Canada / Los Angeles
    That must be it.. looks like a previous owner hack
     
  11. niftyfivefifty

    niftyfivefifty Karting

    Mar 5, 2007
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  13. hwyman

    hwyman Formula Junior

    Jun 25, 2015
    255
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    Yup that’s the part... who would’ve thought that would be factory! And part of the abs system
     
  14. niftyfivefifty

    niftyfivefifty Karting

    Mar 5, 2007
    228
    PacNW
    What’s funny is the 456M uses the exact same ABS ECU, but it does not have any jumpers.
     
  15. hwyman

    hwyman Formula Junior

    Jun 25, 2015
    255
    Canada / Los Angeles
    Strange, seems like an after thought
     
  16. dersark_painclinic

    dersark_painclinic Formula Junior

    Mar 8, 2005
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    Glendale, CA
    Full Name:
    Lazik Der Sarkissian
  17. Qavion

    Qavion F1 Rookie
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    What are the wire colours on the other side of the jumper? Yellow, black and ???

    Looking at the 550 wiring diagram for the ABS/ASR, the only 3 pin connector with yellow and black wires has the strange label "Connecting joint between ABS/jumper or electric actuators".

    Ferrari_550_ABS_&_ASR_Wiring_Diagram
     
  18. niftyfivefifty

    niftyfivefifty Karting

    Mar 5, 2007
    228
    PacNW
    Very strange! I seem to recall the jumper has a specific resistance as well, like 15ohms, so it must be defeating/neutralizing something in the system that is active in the 456M.
     
  19. Qavion

    Qavion F1 Rookie
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    I think it's a Canbus resistor. It may be enabling rather than disabling something.

    For the technophiles...

    https://www.ni.com/en-au/innovations/white-papers/09/can-physical-layer-and-termination-guide.html

    "High-speed CAN is the most common CAN transceiver. It is used in nearly every production automobile and is required in model year 2008 and later On-Board-Diagnostic (OBD-II) vehicles sold in the USA. "

    "
    High-Speed/FD CAN Termination
    For high-speed/FD CAN, both ends of the pair of signal wires (CAN_H and CAN_L) must be terminated. This is because communication flows both ways on the CAN bus. CAN_L is pin 2 and CAN_H is pin 7 on the standard 9-pin D-SUB connector. The termination resistors on a cable should match the nominal impedance of the cable. ISO 11898 requires a cable with a nominal impedance of 120 Ω; therefore, you should use 120 Ω resistors for termination. If you place multiple devices along the cable, only the devices on the ends of the cable need termination resistors."
     
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