HKS3 V3.1 Wiring Diagram needed for 2015+Subaru WRX FA20 DIT

[Tuning Technologies]

Hello Richard,

Is there a wiring diagram for the 2015+ WRX DIT ? I found the one for the HFS4 V3.1 but I want to be 100% sure the installation is correct.

Another shop used the HFS4 V3.1 diagram thats found online to install but I cannot get the system to self trigger. Its also showing a open circuit for the boost solenoid so I assume they're trying to use the DHB failsafe function.

Any help appreciated as usual.


Cheers