For Review: 348 Exhaust ECU/SLOW DOWN Schematics | FerrariChat
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For Review: 348 Exhaust ECU/SLOW DOWN Schematics

Discussion in '348/355' started by No Doubt, Jul 10, 2006.

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  1. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #1 No Doubt, Jul 10, 2006
    Last edited by a moderator: Sep 7, 2017
  2. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #2 No Doubt, Jul 10, 2006
    Last edited by a moderator: Sep 7, 2017
  3. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #3 No Doubt, Jul 10, 2006
    Last edited by a moderator: Sep 7, 2017
  4. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #4 No Doubt, Jul 10, 2006
    Last edited by a moderator: Sep 7, 2017
  5. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #5 No Doubt, Jul 10, 2006
    13a and 13b are the main A/F ECUs
    25a and 25b are the exhaust ECUs
    128 and 129 are the SLOW DOWN lights on the dash


    *hat tip to Vern Cornell
     
  6. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #6 No Doubt, Jul 11, 2006
    I'm not 100% certain, but the way that I read the old Motronic 2.5 schematics above, each of the exhaust ECUs has 6 pins...but connected differently (weird, considering that swapping the exhaust ECUs is useful for diagnosing problems).

    25b exhaust ECU
    PIN 1/---> 88 = "speedometer sending unit"
    PIN 1\---> Fuse #6
    PIN 2 ---> SLOW DOWN light 129
    PIN 3 ---> Ground
    PIN 4 ---> no connection
    PIN 5 ---> 54b thermocouple
    PIN 6 ---> 54b thermocouple


    25a exhaust ECU
    Ground <------------------ PIN 1
    SLOW DOWN light 128 <---- PIN 2
    Fuse #6 <----------------- PIN 3
    no connection <----------- PIN 4
    54a thermocouple <-------- PIN 5
    54a thermocouple <-------- PIN 6
     

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