MY97/98 ECU Pin-out & Apexi Fitting
 

The following images provide the Pin-Out for the 3-Connector MY97/98 ECU for the Subaru Impreza WRX/STI/UK

Also provided is information regarding wire swapping and moving of wires for fitment of the Apexi PFC into a MY97/98 Impreza Turbo UK model (Not required if fitting the Apexi into a Jap WRX or STi).

To perform this modification you will need to :

Swap B136 Pin 8 with B136 Pin 10 (Swaps the Cam & Crank Signals)
Move B137 Pin 17 to B137 Pin 7 (Relocates the Fuel Pump Signal)

The numbers indicated with a * on the Pin-Out do not refer to 'Pin Numbers' but to the 'Notes' at the bottom of the diagram


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So if i bought another one it would be plug and play for me as i have a jap sti ?

Yes for Jap it will plug straight in.

98 uk wrx
 

My B137 plug slot 7 and 17 empty for fuel pump relay. I am swapping 8s ECU with JDM 75 STi ECU due to 8s giving wrong key error immobilising car and could not get another 8s matching ignition kit. With the 75 ECU I have installed yellow injectors and orange AFM. I have no idea which terminal is fuel pump relay slot 7 and 17 empty. Any advice how I can get this car to go again?

Are you counting the numbers from the correct way. The image orientation is either ECU or Cable/Connector which will be a mirror image. Without an ECU in front of me I cannot tell which way they have represented it.

IMHO it would not be wise to run a STi ECU in a UK car unless you plan to get it remapped due to the much more aggressive timing and different turbo setup. The only option to remap a MY97/98 ECU it to use ESL Daughterboard via ESL or Duncan at Race Dynamix.

Just spotted you are in New Zealand, so Duncan at Race Dynamix is probably !!!!! not an option. Oh! and you must be our Southest South East Member ;)