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Thread: E92 ecm - iat2

  1. #1
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    E92 ecm - iat2

    Is there an IAT2 input on any models that use E92 ECM? Adding a turbo and I'd like to monitor IAT2. I don't see an IAT2 input in the connector information for the L83 2015 Sierra this powertrain came out of so I'm wondering if its called out on a different model? I'll just move IAT from the MAF to my TMAP if needed. Thanks.
    Last edited by gxp1; 02-04-2020 at 11:39 AM. Reason: typo

  2. #2
    Senior Tuner Ben Charles's Avatar
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    MAT, Manifold Air Temp

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  3. #3
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    Ok thanks. Do you know the pin/connector? I don't see that either. Only air temps are induction air temp pin 49 X2 and ambient temp pin 13 X1.

    I realized I didn't ever hook up an ambient temp sensor. I'll probably just get an ambient temp sensor for the intake and move the IAT to my TMAP.

  4. #4
    Senior Tuner Ben Charles's Avatar
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    MAT, is a calculation based on iat, ECT.

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  5. #5
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    Has to be different depending on application? On the LT4 there seems to be an actual temp sensor in the intake manifold. P/N 12644807 is a temperature/pressure sensor. So maybe check wiring diagrams for that setup? However the actual sensor setup should match the sensor config settings as well or the ECM may not even use the added sensor.

    I am also working on a L83 turbo, not yet running. Planning on breaking the TMAP sensor out from the MAF, replace it with a 3 bar, adding a TCIAP sensor and run the TC-TIAP-TCIAP sensor config. But to do this I need to know the pinouts for TCIAP. I guess these are the same pins as some applications that has a specific BARO sensor but have not found any diagrams yet to confirm.

  6. #6
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    Quote Originally Posted by grandam75 View Post
    Has to be different depending on application? On the LT4 there seems to be an actual temp sensor in the intake manifold. P/N 12644807 is a temperature/pressure sensor. So maybe check wiring diagrams for that setup? However the actual sensor setup should match the sensor config settings as well or the ECM may not even use the added sensor.

    I am also working on a L83 turbo, not yet running. Planning on breaking the TMAP sensor out from the MAF, replace it with a 3 bar, adding a TCIAP sensor and run the TC-TIAP-TCIAP sensor config. But to do this I need to know the pinouts for TCIAP. I guess these are the same pins as some applications that has a specific BARO sensor but have not found any diagrams yet to confirm.
    Yes, this varies by application. In Cadillac ATS-Vs with E92 we have IAT1 and IAT2 as pre-turbo intake air temperature sensors, and we also have MAT (sometimes referred to as IAT3) as manifold air temperature (post intercooler).
    2022 Cadillac CT5-V Blackwing (733 whp)
    2022 Cadillac CT4-V Blackwing (716 whp), 10.750 @ 134.77 mph
    2016 Cadillac ATS-Vs (eleven ATS-Vs in the 9s)
    2008 Pontiac G8 (first G8 in the 10s), 10.727 @ 129.87 mph
    2000 Bonneville SSEi (first 3800 Bonneville in the 10s), 10.711 @ 125.71 mph
    1999 Grand Prix GT (first 3800 FWD in the 8s), 8.902 @ 154.90 mph
    1998 Firebird (first 3800 RWD in the 8s), 843 whp, 8.991 @ 152.12 mph
    1998 Grand Prix GTP (first 3800 FWD in the 10s), 9.499 @ 145.13 mph

  7. #7
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    Quote Originally Posted by Tapout Tuning View Post
    Yes, this varies by application. In Cadillac ATS-Vs with E92 we have IAT1 and IAT2 as pre-turbo intake air temperature sensors, and we also have MAT (sometimes referred to as IAT3) as manifold air temperature (post intercooler).
    Do you have access to the ATS-V E92 wiring diagrams or pinouts? I would really like to check them out.