Which Fuses to Remove and Where? | FerrariChat

Which Fuses to Remove and Where?

Discussion in 'Technical Q&A' started by Gumart1, Jun 23, 2020.

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  1. Gumart1

    Gumart1 Karting

    Dec 22, 2010
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    Highland Park, IL
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    Marty
    I need to disable my ignition system and fuel system to do a compression test on a 360. Which fuses need to be pulled and where are they located?
     
  2. Qavion

    Qavion F1 World Champ
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    Ian Riddell
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  3. Gumart1

    Gumart1 Karting

    Dec 22, 2010
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    Highland Park, IL
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    Marty
    Anyone know which fuses or relays to pull? I found the same thing as Ian, no specific info.
     
  4. Qavion

    Qavion F1 World Champ
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    If no expert input, Marty...


    The F360 wiring diagrams available to the general public don't seem to contain diagrams which would show the relationship between the fuses/relays and the components. On the F355, for example, you know if you pull the fuel pump relay (s), it only affects the pump(s) and the O2 sensor heaters.

    At minimum, I would pull the fuel pump relays to stop fuel getting to the injectors. Then experiment with the Motronic fuses (+15 and +30). This should stop the injectors and spark plugs firing. The starter circuit is the only unknown. On some earlier Ferrari models, the immobiliser and/or F1 TCU can affect cranking. I don't know if the Motronic ECUs have a hand with starting on the F360.
     
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  5. Ferrari Tech

    Ferrari Tech Formula 3

    Mar 5, 2010
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    Wade Williams
    Connect a bump start button directly to the starter, no need to turn the key on and disable fuel and ign. Be aware not to actually run the engine this way as the fans are grounded through the starter wire and won't come on.
     
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  6. Qavion

    Qavion F1 World Champ
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    Wouldn't the fans only cut out with the bump start button pushed or do you mean if you disconnected the normal solenoid connection and fitted only the bump starter button ?
     
  7. Ferrari Tech

    Ferrari Tech Formula 3

    Mar 5, 2010
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    The ground for the fans is the starter exciter wire. When the starter is excited, (12 volts positive) the ground goes away and the fans stop. Keeps more power going to the starter when in use. If you have the starter exciter wire unplugged then the fans have no ground.
    If I recall, the head lights are on the same ground.
     
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  8. hessank

    hessank Formula 3
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    If your car cranks but does not start when the Fob isn't pressed (some do and others don't), i.e. the alarm is still active then the ECU will not send a signal to start.

    You could also pull the Relays # 50 & 94 for the fuel pumps.
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  9. hessank

    hessank Formula 3
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  10. Qavion

    Qavion F1 World Champ
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    There's a similar setup on the F355. The symbology in the starter motor in the wiring diagrams is quite odd and it's difficult to see how the circuit operates. It gives the impression that the starter solenoid is always powered (albeit through the solenoid of the relay which powers the systems inhibited by starting the car)

    Anyway, the compression test method used will be determined by the equipment and people available. The bump switch method seems to be the safest as the operator can see what is going on in the engine compartment during cranking and can stop the cranking immediately.
     
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  11. tbakowsky

    tbakowsky F1 World Champ
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    Sep 18, 2002
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    Disconnect ignition coils and injector harness..easy as pie..run you test..so simple..assuming you have all the plugs out the the engine, the coils will already be out of the picture..
     
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