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S13 SR into OBDII 1996 S14 240SX. Minimum required to run.
The S14 engine harness has the wipers and ABS (optional), whereas these things are on the body of the S13. The easiest way to make this swap work is to unplug the engine harness, but leave the entire S14 engine harness plugged to the car because this harness has all the sensors you will need.
The other main difference is that the ECCS relay is on the engine harness on the S14 and sits next to the ECU, whereas the S13 has the ECCS relay in the underhood relay box.
All wiring will be done at the big white S14 F3 plug and the ECCS relay that sits next to the ECU area. The F3 is the biggest plug in that area.
Dash Plug
Orange - Start Signal, connect to F3 pin 34 Orange
These wires will need to go back into the ECU area. The easiest way is to unloom the main harness and pull these wires back into the interior. Then shorten as needed.
Brown Plug
Red/Black - ECU relay ground pin controlled by pin 4 of ECU, connect to ECCS relay pin 1 Red/Black
Brown - Power source for all sensors, connect to ECCS relay pin 3 Black/White
Black/Pink - fuel pump relay ground pin controlled by pin 104 of ECU, connect to F3 pin 11 Black/Pink
Big Grey Plug
Blue/Red - coil pack power, connect to F3 pin 1 thick Black/Red wire
Black/Red - ingition power, connect to F3 pin 1 thick Black/Red wire
Blue/Yellow - AAC valve power, helps idle, connect to ECCS relay pin 3 Black/White
Black/White - ECU power to pin 47 and 38 of ECU, connect to F3 pin 1 thick Black/Red wire
Red - ECU Backup power to pins 46 and 109 of ECU, follow pin 17 Red on the F3 plug all the way to the S14 ECU plug. Clip the wires on the S14 ECU plug and connect to this Red wire.
Lower harness:
E204: 1 ring terminal. White. Connect to the battery positive terminal.
E205: 1 ring terminal. White. Main power. Connect to the 75A or 100A fusible link at the underhood fusebox.
E206: 1 ring terminal. Black. This is the ground wire for the alternator.
E207: 3 connectors:
1) Large insulated ring terminal. White. Connect to the large stud on the alternator. This wire goes to E205.
2) Small ring terminal. Black. Connect to the small stud on the alternator. This wire goes to E206.
3) Large 2pin connector. Connect to the alternator.
White: fused constant power. This wire goes to E205.
White/Red: CHARGE warning lamp in the gauge cluster. Not needed.
E210: black 1pin. Black/Yellow. Connect to the starter solenoid. Check the E201-203 connector for continuity, and connect to the starter solenoid signal on the body.
Your S13 SR in OBDII should now run. Good luck.
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