SV air temp fault code??? | FerrariChat
Buy

SV air temp fault code???

Discussion in 'LamborghiniChat.com' started by Rv5, Nov 17, 2011.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Rv5

    Rv5 Formula Junior

    Dec 22, 2005
    333
    Full Name:
    Ross V
    #1 Rv5, Nov 17, 2011
    A 99 SV....less than 7K miles....and runs perfectly. But it will usually throw a "check engine" which is preventing it from passing smog here in CA, so I really wanna figure this out so I can drive it again without watching my rear view mirrors so closely.

    Right now I downloaded three codes.....P1111, P0111, and P0112.

    P1111 - Air temperature sensor fault (cylinder 1-6)
    P0111 - Air temperature sensor fault
    P0112 - Air temperature sensor low signal (less than -20 degrees C)

    So who wants to start the bidding? Could this just be a bad sensor? Where is it? And how do I test it?

    I'm fairly new to this car so all your help is appreciated, as in the past.......
     
  2. BULL RUN

    BULL RUN Formula 3

    Dec 18, 2004
    1,684
    #2 BULL RUN, Nov 17, 2011
  3. Rv5

    Rv5 Formula Junior

    Dec 22, 2005
    333
    Full Name:
    Ross V
    #3 Rv5, Nov 17, 2011
    Ok cool...that was helpful. Do you know what the output signal looks like for testing purposes? Temp vs. Voltage? or Temp vs. Resistance? Just to be sure before I buy a new one?
     
  4. Rv5

    Rv5 Formula Junior

    Dec 22, 2005
    333
    Full Name:
    Ross V
    #4 Rv5, Nov 17, 2011
    Last edited: Nov 17, 2011
    Yeah I'd really like to test these as after reading a bit on some of the forums it seems that others in the year 99 have had this problem and have not been able to make it go away. They get it on both the R and L as I recall I have in the past. They just reset it every once in a while, I just want to pass smog. If I know what the signal is maybe I can fake it.....

    Cylinders 1 to 6 are on the passenger side I assume?
     
  5. BULL RUN

    BULL RUN Formula 3

    Dec 18, 2004
    1,684
    #5 BULL RUN, Nov 17, 2011
    The part number is 7M919529 but "no longer available" according to Lambo Stuff. Not good! Winkelman threw them out no doubt. That doesn't mean they can't be found, but expect to bend over. The manual says they are exactly like the water temp sender. "Electrical resistance decreases as there is an increase in temperature and of the relevant connector".

    1-6 is the passenger side and that is the right check engine light just so there's no confusion.
     
  6. gday

    gday Formula 3

    Sep 10, 2004
    1,086
    CA, USA - NSW, AUS
    Full Name:
    Mick
    #6 gday, Nov 17, 2011
    Flip the two for testing.....

    -mick
     
  7. Rv5

    Rv5 Formula Junior

    Dec 22, 2005
    333
    Full Name:
    Ross V
    #7 Rv5, Nov 18, 2011
    When I put that number into LamboStuff it shows 9 in stock......at $284. I do like the idea of switching them, but I also imagine I can just put a resistor across the two terminals to pass smog if its a bad sensor. Well, back to the garage.....I'll keep you posted.....
     
  8. BULL RUN

    BULL RUN Formula 3

    Dec 18, 2004
    1,684
    #8 BULL RUN, Nov 18, 2011
    Sure does. Sorry Wink. I'd be buying one. Not worth jacking with, and is probably the real fix, but we all have our own ideas about trouble shooting.
     
  9. gday

    gday Formula 3

    Sep 10, 2004
    1,086
    CA, USA - NSW, AUS
    Full Name:
    Mick
    #9 gday, Nov 18, 2011
    Last edited: Nov 18, 2011
    The air temp sensor is a thermistor - in this case resistance goes down as temp goes up. The air temp and MAP sensors have to work together to compute air mass. To pass CA smog you are going to need a few ready indicators preset for a good period of time prior to the smog. You ain't going to bypass one and end up with correct closed loop FI operation for any period of time. Flipping them should be a quick deal but so is ordering one!

    -mick
     
  10. Rv5

    Rv5 Formula Junior

    Dec 22, 2005
    333
    Full Name:
    Ross V
    #10 Rv5, Nov 18, 2011
    OK, let me get it out of the garage and take it for a bit of a spin, to get fresh data. I do seem to recall that I used to get these air temp fault codes on both sides, but this time it only showed one. Switching is a good idea either way. I'll report back soon.....

    On a slightly related thought, I found an article regarding reseting the master computer so the CEL history goes away. Since it takes a bit for these fault codes to be generated one might be temtped to reset the master just before rolling into the smog station......code and history free. The only thing that worries me is the article I found says damage can be done by shorting the wrong pins (which I won't do) and but that the correct pins changed from year to year....what the hell's up with that?
     
  11. gday

    gday Formula 3

    Sep 10, 2004
    1,086
    CA, USA - NSW, AUS
    Full Name:
    Mick
    #11 gday, Nov 18, 2011
    Last edited: Nov 18, 2011
    Won't work. The absence of trouble codes / MIL is only one part of the test. As I mentioned, you have to have a decent number of OBDII ready indicators set to even start the smog check. That is the operators first thing to do. After a ECU reset none are ready and wont be ready until the ECUs have had a decent amount of time running - which by then you will have more than likely set a code. And none of this is Lamborghini specific.

    -mick

    PS As a bit of related trivia, come 2013 California smog checks with 2000 or newer vehicles will only require visual and ECU ready indicator checks ie no tail pipe measuring since the ECUs are good at detecting problems all by themselves.
     
  12. Rv5

    Rv5 Formula Junior

    Dec 22, 2005
    333
    Full Name:
    Ross V
    #12 Rv5, Nov 18, 2011
    OK, I get what you're saying. Well then let's fix it!!!
     
  13. gday

    gday Formula 3

    Sep 10, 2004
    1,086
    CA, USA - NSW, AUS
    Full Name:
    Mick
    #13 gday, Nov 18, 2011
    The pins that need to be shorted/grounded don't change year to year. There are two distinct designs of the ECUs as far as this part goes. Ones prior to OBDII (96) and ones after - and thats it.

    -mick
     

Share This Page