550 M STILL HAS CHECK ENGINE LIGHT PROBLEM | FerrariChat
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550 M STILL HAS CHECK ENGINE LIGHT PROBLEM

Discussion in 'Technical Q&A' started by kdross, Oct 27, 2021.

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  1. kdross

    kdross Formula Junior
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    Feb 10, 2002
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    NJ
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    Ken
    #1 kdross, Oct 27, 2021
    WHEN TRYING TO START THE BEAST ,TURN KEY IN ON POSITION IT WILL NOT HAVE CHECK ENGINE LIGHT ON AND IT WILL CRANK BUT WONT START. TURN KEY BACK TO OFF AND TURN TO ON POSITION CHECK ENGINE LIGHT COMES ON AND CAR WILL START. WHEN CHECK ENGINE LIGHT NOT ON WITH KEY ON POSITION THE DASH CLUSTER WILL PUT UP ASR AND SLOW DOWN LIGHT IN CLUSTER WINDOW. WE HAVE TESTED BOTH ECU AND FLIP THEM, ALARM MODULE AND IMMOBILIZER CHECKED BY ECU COMPANY. REMOVE ABS AND ALARM SIREN AND THERMO MODULE. CHECK VOLTAGES AT IGNITION SWITCH , SEVEN WIRE SWITCH THREE HOT ALL THE TIME AND RED AND BLUE WIRE HOT WITH KEY IN POSITION ONE , POSITION TWO LIGHT BLUE AND BLUE AND BLACK HOT, WHITE WIRE HOT WHEN CRANKING. NEW GT CAR PART FUSE BOX AND RELAYS. WITH NO CHECK ENGINE LIGHT THE OB2 READER SAID LINK ERROR OR AT TIMES P0600
     
  2. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
    #2 Qavion, Oct 27, 2021
    Last edited: Oct 27, 2021
    For other people interested in this problem, this is all correct.

    Why? Did you put them back again? Did you fit new parts? The ECU might need vehicle speed data (from the ABS system). Also, the ECU won't like having no cat temperature data. I can't say if it will stop the engine running. I haven't tried it.

    P0600 is communication between the Left & Right Motronic ECUs.

    I was going to suggest looking at plug 176, which is between the Left and Right ECUs, but the strange behaviour when you cycle the ignition key doesn't make me think it's a wiring problem.

    For info, plug 176 is found in the engine wiring diagrams:

    Left:

    https://www.dropbox.com/t/zRLGGIA4cXHPOWIq

    Right:

    https://www.dropbox.com/t/zapp3p1j1nM5crcB

    Also for info, the plug is at the back of the engine (upper half) near the firewall and is quite hard to get to. I know the Ferrari 456 has a problem with plugs in this area, but they are a circular twist type, not a rectangular, clip type.

    Did the people who checked your ECUs check the CAN Bus circuits (for inter-ECU communications)?
     
  3. Turbopanzer

    Turbopanzer F1 World Champ

    Oct 2, 2011
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    Panzer
    #3 Turbopanzer, Oct 27, 2021
    Does this vehicle utilize a digital ignition key?
     
  4. tazandjan

    tazandjan Three Time F1 World Champ
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    Jul 19, 2008
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    Terry H Phillips
    #4 tazandjan, Oct 27, 2021
    No, just a key fob that disarms the alarm and immobilizer. Key is dumb.

    SOUNDS LIKE SHE NEEDS A NEW BATTERY.
     
  5. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
    #5 Qavion, Oct 27, 2021

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