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bypassing cat ecus?

Discussion in 'Technical Q&A' started by petearron, Jul 10, 2009.

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  1. petearron

    petearron Formula Junior
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    Jul 1, 2009
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    Las Vegas
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    jeff
    #1 petearron, Jul 10, 2009
    My cat ecu has failed on my 355, I am running test pipes no cats so don't need them. You can disconnect the faulty ecu the car runs on all 8 but you have the slow down light permanently on, the ecus guts are encased in epoxy so no dismantleing them the ecu plug on the car gives 14v power then 5 volts to the center connections 2 then the last is ground.

    Anyone bypassed these with a jumper wire or something else? $400 for another ecu that's gonna fail again doesn't seem right.
     
  2. JIMBO

    JIMBO Formula 3
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    Oct 31, 2003
    1,372
    Bradenton, Florida
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    Jim DeRespino
    #2 JIMBO, Jul 10, 2009
    On my 512TR I disconnected the cat thermocouple ecu's at the connection where they enter the main harness. No slow-down lights for over 20Kmiles. I, too have test pipes. I also hollowed out the honeycomb material in the pre-cats and was able to discard the rusty outer casing, then bead blast and paint the pre-cats. The sound is awesome with the tubi. Hope this works for you. My car is 1994 US spec.
     
  3. petearron

    petearron Formula Junior
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    Jul 1, 2009
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    jeff
    #3 petearron, Jul 10, 2009
    Thanks but it only seems to work on pre 94 ferraris, you can disconnect the ecus on 348s as well with no problems I get slow down lights on my 355 which is a 95 btw and it doesn't seem to run as well though its firing on all 8.
     

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