The G4X WRXLink (3-4) Plug-In ECU supports the following options for fitting of an IAT sensor:

1.Factory IAT Sensor – Some models supported by this ECU are factory fitted with an IAT sensor. The factory IAT sensor is wired to An Temp 2.

2.IAT Through Expansion Connector - The expansion connector provides ground and temperature channels for the connection of an IAT sensor. Note spare An Volt channels can be used as temperature inputs when a pullup resistor (to +5V) is added.