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355 US version bypass ecu

Discussion in 'Technical Q&A' started by JeffBarber, Aug 3, 2011.

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  1. JeffBarber

    JeffBarber Karting

    Feb 6, 2011
    175
    Lascassas, TN
    Full Name:
    Jeff
    #1 JeffBarber, Aug 3, 2011
    Does anybody know how the extra cat ecu/thermocouple works on the US version of the 5.2 355? I know the other two are to detect the overheat cat situation and activate the slow-down light, but the manual only says that this particular ecu on us version is used to control / lets the ecu know that the bypass valve is open. Is it also detecting overheat or simply relaying info on valve? If anybody knows, do you happen to know what voltage range does what?
     
  2. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #2 f355spider, Aug 5, 2011
    To the best of my knowledge it is only detecting whether the exhaust bypass valve is open or closed when the Motronic expects it to be. If not, it throws a "check engine" light. I have no idea on the voltage parameters.
     
  3. JeffBarber

    JeffBarber Karting

    Feb 6, 2011
    175
    Lascassas, TN
    Full Name:
    Jeff
    #3 JeffBarber, Aug 5, 2011
    Thanks for the reply, I've installed a voltage divider and a potentiometer that varys it from 0 to 4 volts, I will be studying it. Also, can't find the thread but I had a P1447 and Ernie I think replied it could be the slow down light, sure 'nough, I fixed that one tonight, slow down light had been pulled. I'm currently tags expired status and can't pass emissions but am having success working my codes so far, backup plan is to register in an emissions free county.
     
  4. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #4 f355spider, Aug 6, 2011
    Glad you caught that. Though 99% of the time "slow down" lights are inevitably a fault in the detection circuit, rather than a catalyst overheating, you really want to have the system operational...just in case. ;)
     

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