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I need a big favor from a 5.2 F355 owner

Discussion in '348/355' started by Rob'Z, May 25, 2014.

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  1. Rob'Z

    Rob'Z Formula 3

    Mar 29, 2008
    1,024
    Tucson,AZ
    Full Name:
    Robert
    #1 Rob'Z, May 25, 2014
    I finally found some time to fiddle with my car and try to diagnose/repair the no start condition. I have 12v at pin 26/Row 1 and pin 54/Row 2 but not at pin 27/Row 1. With the key OFF or ON it has 0.0v and when I crank over the engine it has .08-.1v. According to this thread
    http://www.ferrarichat.com/forum/348-355-sponsored-bradan/444614-f355-ecu-pin-out-wiring-colors.html
    I'm guessing I should be seeing 12v.

    If someone (with a running car) could check they're numbers with the ECU removed I would greatly appreciate it.

    I used a rear passenger seat bolt for a ground, nice and close.


    Thank you in advance.


    Rob
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,669
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, May 25, 2014
    That signal is negative logic. The ECU grounds that signal to turn the main relay on which feeds 12V to the fuel pump, the fuel injectors and the rest of the ignition.
     
  3. Rob'Z

    Rob'Z Formula 3

    Mar 29, 2008
    1,024
    Tucson,AZ
    Full Name:
    Robert
    #3 Rob'Z, May 25, 2014
    Hmmm, it was listed as 12v.

    Also, my dome light is on whenever the battery is switched on, it does not go out, the switch has no effect. Not sure if it's related in any way.
     
  4. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,669
    San Carlos, CA
    Full Name:
    Mitchell Le
    #4 yelcab, May 25, 2014
    It is listed as relay controlling 12V to the ignition system. It means the signal activates the relay that connects 12V to the ignition circuit. It does not mean 12V activates and OV deactivates.
    '
    You have a fault someplace in the car that keeps the light on. Find that first and you may find your other problem too.
     

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