!@!$#% 1996 gmc 2500

Discussion in 'GMC Truck Forum' started by ordr2kaos, Dec 13, 2016.

  1. ordr2kaos

    ordr2kaos New Member

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    Greetings all,have a question.I am working on a 1996 gmck2500,my problem is my tft sensor is sitting at -40 inside a warm shop,i know the dominoe effect at this temp.I ohmed the tft and at the temp the shop is,it is right on the money,i have ohmed pin l and m to the pcm,all is well.......any suggestions,oh and for giggles i performed that vcm revision on a possible ground issue,any idea's out there,thanks!
     
  2. leolkfrm

    leolkfrm Full Member

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    -40 ? degrees?

    what do you need to know? why are you messing with it?
     
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  3. ordr2kaos

    ordr2kaos New Member

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    Hey Leo,well i am messing with it because it is not -40 in the shop and this thing will not shift properly,i think -40 is a default setting,and was wondering why it sits at that temperature,i am sure the tft has alot to do with pc pressure,i am at a loss here,thank you for your reply.
     
  4. hatzie

    hatzie Full Member

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    The TFT sensor ohms out correctly at the sensor for the shop temp.
    You get the same ohmage at the PCM or TCM connector?

    Is the PCM TCM expecting you to reset the input channel?
    The reason I ask is the BCM in my Impala did something similar when the ambient temp sensor in the grille died.
    AC refused to work because it thought the outdoor temp was -20°F. It stayed that way after I replaced the sensor.
    I had to re-initialize the input channel on the BCM using the appropriate Tech 2 incantations and sacrifices to get it to acknowledge the sensor was actually working.
     
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