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Thread: IAT2 (MAT) pin number on PCM?

  1. #1
    Tuner in Training
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    IAT2 (MAT) pin number on PCM?

    What pin does the TMAP sensor temperature output connect to on the PCM? I can't find an LT4 wiring diagram anywhere.

  2. #2
    Advanced Tuner
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    Try this.
    Attached Files Attached Files

  3. #3
    Tuner in Training
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    Thanks. I was wondering if the trucks could be wired the same as the LT4s. The temp output of the TMAP connects to X1-13, which is the outside ambient input of the truck PCM. I guess it's the tune that determines the mapping of the sensors.

  4. #4
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    X2 49 is the #1 input, lt4 has multiple sensors with addition of supercharger (blower).

  5. #5
    Tuner in Training
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    Do you happen to know where the ambient sensor inputs are for the LT4? Are there ambient PCM inputs on the LT4 or is ambient only fed to the BCM?