Lamba Circuit, how does the expansion tank switch? | FerrariChat
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Lamba Circuit, how does the expansion tank switch?

Discussion in '308/328' started by cmt6891, Jul 21, 2011.

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  1. cmt6891

    cmt6891 Formula 3

    Feb 25, 2008
    1,340
    Encino, Ca
    Full Name:
    Carl T
    #1 cmt6891, Jul 21, 2011
    I am trying to confirm for Lamda controlled 3X8's, what appears to be a Thermal switch or sender in the coolant expansion tank, in fact what is it's function. If it is a switch is it involved with the cold/warm start function by controlling the CSI or is is purely a temperature sensor. The Ferrari P/N 121777 and it is not a Bosch part.
     
  2. Paul_308

    Paul_308 Formula 3

    Mar 12, 2004
    2,345
    #2 Paul_308, Jul 21, 2011
    Last edited by a moderator: Sep 7, 2017
    Hope this helps, Carl,...the thermal switch presents a ground at #7, the violet wire, extending also to #7 of the ECU module.

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    edit - guess I best add, since it's half your question, the cold start injector (through the tt switch) is the white wire at pin #2.
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  3. cmt6891

    cmt6891 Formula 3

    Feb 25, 2008
    1,340
    Encino, Ca
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    Carl T
    #3 cmt6891, Jul 21, 2011
    Somewhat more than then before...so no logic in the thermal switch, just a constant ground or does coolant temp trigger the CSI however through the ECU?
     
  4. cmt6891

    cmt6891 Formula 3

    Feb 25, 2008
    1,340
    Encino, Ca
    Full Name:
    Carl T
    #4 cmt6891, Jul 21, 2011
    Essentially, I'm attempting to identify the thermal switch connection to cold and hot start conditions.
     
  5. forrest1

    forrest1 Karting

    Jan 8, 2011
    56
    San Diego
    Full Name:
    Forrest
    #5 forrest1, Jul 22, 2011

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