NIStune Feature Pack V.1 - Manual (Page 21)

Page 21 of 27
RB25DET using RB20DET ECU
Fuel Pump Idle Control output (23710-11UXX/04UXX R32 ECU)
1. Remove Fuel Pump Control idle output.
Pin 104 - Controls idle fuel pump voltage to Fuel Pump Control Module (FPCM). When installing an aftermarket high
flow fuel pump, it should be controlled directly from the fuel pump relay rather than FPCM.
This ECU output is normally used to vary fuel pump idle speed with the factory fuel pump. This pin will no longer be
used and the output from the ECU will control the VCT
HCR32_FOR_RB25_11U0F_MT_TPS_VCT_VFCOUT_v5_FP.ENT
1. Cut pin 104 from ECU connector to pad on board, leaving about 2mm exposed from board.
2. Slightly push other pins to access pin 113
Add solder to pin 104 (from ECU board)
Add solder to pin 113 (VCT from connector)
Add solder to pin 107 (top ground pin)
3. Source BD679 Darlington Transistor (SOT-32 package) and pre-tin (solder) ends of transistor
Available from Farnell (Element-14) and other electronics specialists
4. Solder transistor to ECU with shiny shielded side facing upwards
Pin 1 (Base) - Solders to pin 104 coming from the circuit board
Pin 2 (Collector) - Solders to pin 113 coming from ECU plug (VCT output)
Pin 3 (Emitter) - Solders to pin 107