====== SD Options - No IAT ======


===== Disabling the IAT sensor in ECMLink =====


You disable IAT compensation while running SD by setting the **SDTempWeighting ** table in direct access to all zero. This removes IAT compensation while retaining basic coolant-based compensation.


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{{  :sdtempweighting-zero.png?nolink&631x68  }}


===== MAP Sensor Options =====


If you choose not to run an IAT sensor, then you only need a MAP sensor to run SD. We have two MAP sensors available on our website:


[[https://www.ecmtuning.com/product_info.php?cPath=28_30&products_id=47|GM-style]]- Provides a general-purpose port-style nipple interface you can run a simple vacuum line to.


[[https://www.ecmtuning.com/product_info.php?cPath=28_30&products_id=66|Mitsubishi-style]]- Mounts in place of a factory 2G MDP sensor on a factory 2G-style intake manifold.


Both are the same 4-bar sensor internally, so there's no decision there.

==== GM-style MAP with no IAT ====


If you're running a GM-style MAP with no IAT sensor, you'll still need to decide how you want to wire the MAP sensor into your harness. You can use our [[https://www.ecmtuning.com/product_info.php?cPath=26&products_id=52|SD Cable]] if you want a plug-n-play solution. You'll just leave the IAT connector unused.


Or you can wire the MAP sensor into the wiring harness using our pig tail. The red wire goes to +5v, the black wire goes to sensor ground and the blue wire goes to whichever [[:externalsensorinput|ECU input]] you've chosen for the MAP. The most common is the baro input, but that depends on a few other decisions like whether you're going to retain the stock MAF while dialing in the SD VE table. Pin out information can be found on our [[:ecuwiringinformation|ECU wiring information]] page.


==== Mitsubishi-style MAP with no IAT ====


The Mitsubishi-style MAP plugs directly into your 2G MDP harness connector. The MAP sensor bolts onto the intake manifold in place of the [[https://www.ecmtuning.com/images/forums/gm3barinstall/map_unplugged.jpg|factory MDP sensor]]. So make sure you're either running a factory 2G DSM intake manifold or that your manifold has been adapted with this flange.