eRRfhang

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eRRfhang reacted to Simon in RB25DET S2 wiring in IAT sensor and MAC Boost Solenoid March 7, 2020

You will need a free Aux output that can then be set as engine fan. This will then provide a ground to turn on a relay that controls the fans.
Pin 9 might be a good option if you are not running AC.
eRRfhang reacted to Adamw in RB25DET S2 wiring in IAT sensor and MAC Boost Solenoid March 3, 2020

If you want to use existing wiring for the IAT then probably the easiest option is at the ecu connector pull the AFM signal wire out of pin 27 and move it to pin 36. Pin 36 is AN Temp 2. Then in the engine bay connect your temp sensor to the AFM signal and AFM ground wires.
eRRfhang reacted to Adamw in RB25DET S2 wiring in IAT sensor and MAC Boost Solenoid March 3, 2020

So is this a GTS/GTR ecu or the R34 GTT ecu?
For the boost solenoid they are not polarity sensitive so it doesnt matter which wire gets connected to the ECU, the second wire needs to be connected to a +12V source that is only live when the ign switch is on.