DIY ODBII working standalone wiring harness

[redfogo]

My Website version: http://redfogo.com/index.php/wiring/

As promised and also the main reason why I have yet to updated my build in a few months is I have been wiring and documenting the wiring on my 818. My goal was to wire up and get the car to run before I updated anything else. I am running a 2002 STI EJ207 Engine and ECU with a 2003 WRX harness. I deleted a lot of things and made a stand alone harness. My cars ODB2 port and ECU work correct, and all the engine sensors are happy.

Note: I am running an Infinity Box so I am only running the engine with OEM wires. Lights, gauges, OEM fuses, and the OEM Relays are all deleted. You may need to keep a few more wire,relays, and fuses if you plan to not use an infinity box. This guide should still help. The main thing you will need if your not going to use an infinity box is the main relay, Both fuse boxes(or make a smaller one), and the ignition relay. Again this is an engine only harness, if you follow this guide and don't use an infinity box you will still need to wire your own body harness for things like lights, signals, wipers, horn, etc.

I have successful started the car and ran it with only a check engine lights for the rear O2 sensor and VSS sensor I had deleted.

If there is anything you guys feel I need to be more clear on please let me know and I will make sure to fix things.

Rather the reinvent the wheel with wiring diagrams I have edited the OEM diagrams and will explain each page as we go. The engine harness is all you need the rest of the lights, switches, and other optional things are all deleted. After you have gutted the harness you will only have engine plugs and sensors remaining. Goodbye OEM wiring: ABS, A/C, horn, cruise control, security, lighting, switches, relays, airbags, etc.

Page 1:
Section1.PNG

Fuel Pump Relay
-LR:
--Power from Main relay
--This line is not needed since power is drawn from the infinity box straight to the pump controller.
-GR:
-- Signal wire for pump relay and goes to page 10 which ends up connecting to Ignition coil 1.
--Im running a DCCD fuel pro so I am running the GR wire from the ecu & IG coil to the fuel positive on the DCCD fuel pro. This also works as the inline fuse that's called for in the top since it uses the Infinity box fuse.
-B:
--Not needed
-BY:
--Not needed if your running a DCCD fuel pro.

Fuel Pump controller (https://www.dccdpro.com/product/fuelpro/)
Note: I'm running a DCCD fuel pro since I have a Walbro 450 pump.
-VW:
--ECU demand signal. This wire is needed for the DCCD pro ECU pin.
-LgR
--wire is just a 12V line to inform ECU the controller is alive. Connect to DCCD fuel pro with the GR(pump relay) line and Infinity box power line.
-BW
--Connect the DCCD Pro supply Negative/ground line. This is the ground to the pump
--I removed this line altogether and used the wire directly from the pump connector so I had a B color wire to my DCCD fuel pro.
-BOr
--Connect to DCCD Pro Positive Supply line. This is the power for the pump
--I removed this line altogether and used the wire directly from the pump connector so I had a BR color wire to my DCCD fuel pro.
-BY
--Deleted since I have no fuel pump relay
-B
--Deleted. But you will still need some kind of ground wire for your DCCD fuel pro.

Fuel Pump Assembly R58
-Fuel pump
--BR
---Connect to DCCD fuel pro supply positive
--B
---Connect to DCCD fuel pro supply negative.

Everything else can be kept or removed. I deleted everything else in red. Make sure to remove any unused wires from the ECU.