# DET 3 sensor questions

**URL:** <https://community.ecumaster.com/t/det-3-sensor-questions/3030>\
**Category:** OTHER DEVICES\
**Created:** [January 9, 2025, 11:04pm UTC](https://community.ecumaster.com/t/det-3-sensor-questions/3030 "2025-01-09T23:04:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![artec12](https://avatars.discourse-cdn.com/v4/letter/a/ecccb3/32.png) [@artec12](https://community.ecumaster.com/u/artec12)\
**Post date:** [January 9, 2025, 11:04pm UTC](https://community.ecumaster.com/t/det-3-sensor-questions/3030/1 "2025-01-09T23:04:52Z")

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Hello,

I wanted to ask if I want to add an external IAT sensor what should the wiring be? Pin 1 of IAT to pin 11 ground (i assume there is no sensor ground in this ecu), Pin 2 to analog input and pin2 shall be connected to 5v with a 2.4kohm resistor?

In addition I wanted to ask if the analogue input 2 is not useable when using the built-in map.  
If that’s the case there is no space for lambda sensor. TPS, CLT, IAT and MAP are mandatory so there is no spare input left.