Ohm specs for 355 Motronic 5.2 MAF sensor? | Page 2 | FerrariChat
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Ohm specs for 355 Motronic 5.2 MAF sensor?

Discussion in '348/355' started by f355spider, Feb 24, 2008.

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  1. No Doubt

    No Doubt Seven Time F1 World Champ

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    #26 No Doubt, Mar 1, 2008
    Last edited by a moderator: Sep 7, 2017
    Not so fast, Vern.

    EuroSpares shows the Ferrari 355 M2.7 versions using the same MAF as does the Motronic 2.7 512M.

    The 512M's MAF is shown below, and it has the same CO screw and plug (part #6) as does the Ferrari 348 MAF (plug is part #10 shown below in second pic).
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  2. Llenroc

    Llenroc F1 Veteran
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    #27 Llenroc, Mar 1, 2008
    Like I said you can't adjust the CO on a 2.7 355. I have one in my garage, no screws no adjusting. My factory parts manuals show 2 different part #s for the 348 unit and 355 unit. Weren't you the one telling me one time that reading the owners manual didn't mean much because of the errors you might find. Well maybe you are reading an error.
     
  3. No Doubt

    No Doubt Seven Time F1 World Champ

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    #28 No Doubt, Mar 1, 2008

    Easy enough to verify. Eurospares shows two part numbers for the MAFs on M2.7 355's:
    138403
    and
    154916


    Which MAFs do you have?
     
  4. Llenroc

    Llenroc F1 Veteran
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    #29 Llenroc, Mar 1, 2008
    154916 with no caps no screws and only 5 wire plug vs 6.
     
  5. No Doubt

    No Doubt Seven Time F1 World Champ

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    #30 No Doubt, Mar 1, 2008
    So is 138403 a valid 355 MAF?
     
  6. Llenroc

    Llenroc F1 Veteran
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    #31 Llenroc, Mar 1, 2008
    No. they are wrong, my factory parts books show 138# for 348 and the other for 355. I suppose you could use the 138# on a 355 2.7 but what good would it do, the 6th terminal on the 138# is the adjusting lead for the CO and the 355 doesn't have that terminal in its plug. ie; the ECU has no read input because its preset.
     
  7. No Doubt

    No Doubt Seven Time F1 World Champ

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    #32 No Doubt, Mar 1, 2008
    OK. Thanks for the info.
     
  8. No Doubt

    No Doubt Seven Time F1 World Champ

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    #33 No Doubt, Mar 2, 2008
    Hey Vern, out of curiousity for the original question on this thread, do you get a 383 ohm resistance measurement between pins 1 and 5 on your MAF?
     
  9. f355spider

    f355spider F1 World Champ
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    #34 f355spider, Mar 2, 2008
    Ah, but this thread is SPECIFICALLY about the 5.2 Motronic. Unfortunately, you have diverted this thread in a confusing and different direction from what was intended.
     
  10. No Doubt

    No Doubt Seven Time F1 World Champ

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    #35 No Doubt, Mar 2, 2008
    I'd be curious to know if you get a resistance measurement like "383 ohms" between pins 1 and 5 on your 5.2 MAF. That *may* be a way to check one part of the calibration.
     
  11. f355spider

    f355spider F1 World Champ
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    #36 f355spider, Mar 2, 2008
    It would be infinity. There is no pin #5 on a MAF for a 5.2 Motronic F355. Please, no more comparison with your 348, this system is obviously different.
     
  12. gothspeed

    gothspeed F1 World Champ

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    #37 gothspeed, Mar 3, 2008
    +1 lol.......... I believe our 5.2 MAF has 4 pins.....:eek:.......... though I do not know what pin does what. However I do know we have a separate temp sensor downstream of the MAF, where I think the 2.7 has 2 of its pins designated for a 'MAF integrated' temp sensor.
     
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