550M NO START | FerrariChat

550M NO START

Discussion in 'Technical Q&A' started by kdross, Apr 15, 2021.

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  1. kdross

    kdross Formula Junior
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    Ken
    #1 kdross, Apr 15, 2021
    NO IGN.,FUEL PRESSURE OR INGECTOR PLUS CHECK OB2 CONEXTOR AND READS NO CODES , WILL NOT LINK UP TO ECMS. DROP FUSE BOX AND CHECK ALL FUSES, GOOD. LIGHTLY HIT FUSE BOX AND CAR STARTED. BAD FUSE BOX
     
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  2. kdross

    kdross Formula Junior
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    #2 kdross, Apr 15, 2021
     
  3. Qavion

    Qavion F1 World Champ
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    #3 Qavion, Apr 15, 2021
    Did you punish it? :D

    Good tip.

    I thought you may have disturbed a relay by doing this, but I can't think of any which would cause this behaviour. No comms probably means you're either not getting battery or ignition power to the Motronic ECUs. Battery power goes through fuses, not relays. Ignition power comes straight from the key.

    If it happens again, check for live battery power on fuses 8 and 9. Or live battery power at plug G (pin 9 red/blue wire) and pin J (pin 5, red/blue wire).

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  4. kdross

    kdross Formula Junior
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    #4 kdross, Apr 17, 2021
     
  5. kdross

    kdross Formula Junior
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    #5 kdross, Apr 17, 2021
    THANKS FOR REPLY , WHEN NO START FOUND ALSO OB2 READER DOSENT WORK AND THEN WHEN IT LIGHTS UP IT POST P0600 CODE.DO YOU HAVE WIRE DIAGRAM SO I CAN CHECK POWER AT ECUS. POWER AT ALL FUSES BUT DONT KNOW IF AT PIN ECU. THIS CAR HAD ALARM BY-PASS BY ECU SPECIALIZED, SEEMS TO BE WORKING. THE CD I HAVE SPECK OF POWER SUPPLY RELAY?? MORE THAN WILLING TO PAY FOR INFORMATION 1-856 547 6522 STAN
     
  6. fatbillybob

    fatbillybob Two Time F1 World Champ
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    #6 fatbillybob, Apr 17, 2021
    car running now?
     
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  7. Qavion

    Qavion F1 World Champ
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    #7 Qavion, Apr 17, 2021
    Do you have a workshop manual reference? The ECU does control relays, but only after it has been supplied with battery and ignition key power.

    The workshop manual should have wiring diagrams, but they have lots of errors. They misidentify the engine banks and mislabel the pins on the ECU. My diagrams may be easier to follow.

    Right engine bank

    https://www.dropbox.com/t/VptLUbkk7VI1HxJx

    Left engine bank

    https://www.dropbox.com/t/qP3bUJo1pB24MTzF

    The other side of the engine/dashboard plugs

    https://www.dropbox.com/t/Fzoff2HDTdiLDfq9

    Immobiliser and some OBD2 wiring

    https://www.dropbox.com/t/68mGUZkcHEF3tQIe

    The links expire in 6 days

    The ECU needs key power to be able to send data to the OBD2 port. I believe the OBD port is powered by the cigarette lighter fuse (no relays, live battery power). I think you already understand that the immobiliser needs to be deactivated on unmodified cars for the ECU to be able to communicate with the OBD2 port.


    Sorry, I only offer free, unqualified advice. I'm sure there are a few Ferrari specialists in NJ.
     

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