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Old 04-14-2005, 04:22 PM   #1
agterlik
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Default OBDII port (data link connector) wiring

I tried to wire up my data link connector so that I could pull my cel codes for my swap. Its an 03 wrx ecu/harness wired into the 2001 rs harness. When I attempted to hook up the cel scan tool it got no signal from the OBDII port. I think that the wiring issue is with pin 6. On the wrx it goes to plug 250 pin 2 (flash memory connector). On the rs pin6 went to B76 pin 2 (Test mode connector). Looking at the wiring there is no flash memory connector atleast by that name. Any idea what to hook the wire going into pin 6 to? Also pins 4 and 5 were used on the rs and are not on the wrx so I removed those wires and hooked one into pin 8 which I then wired into the correct signal off the ecu. Any suggestions what to hook pin 6 up to or did I make a mistake with removing pins 4 and 5 since they are not on the wrx wiring schemetics.

Cliff notes:What wire in the rs harness does pin 6 get hooked to for the wrx obdII port.
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Last edited by agterlik; 04-14-2005 at 04:51 PM.
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Old 04-14-2005, 04:39 PM   #2
YaZahX
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this was too muhc reading for me, but my 2 cents:

when i did my swap when i wired the OBD i used all the pin locations for that ECU to use, so if the RS uses pin 5 and the wrx uses pin 6, put the wire to 6, all the old pin outs wont be the same, i think maybe 1 or 2 will be the same.

when i wired mine i used the obd connector from the STI, didnt have any problems
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Old 04-15-2005, 06:38 PM   #3
dentprone
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i dunno if its any help but with my 1999 rs the obd2 port had extra wires for the subaru select monitor...i just cut them out cuz the wrx harness didnt have the wires... the only wires i used were
power supply.... line endcheck 1....line endcheck 2... and K line of 9141 CARB... and two ground wires.... all the wires went from the obd2 port over to the ecm i just spliced them over at the ecm.. accordingly.. using the two wiring schematics...
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Old 04-16-2005, 08:44 AM   #4
xcntrk75
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You may have to mess with them a little to get it to work properly. I had the same problem where I was down to the 3 wires from the ECU which donít directly correspond to my existing harness and plug setup.

Power and ground is easy, Iím sure you got that figured out. From there I connected the only corresponding pin (10 I think) between ECUís. I then tested the other two not knowing which they ran. First time up no connection via my OBD-II reader. I then swapped the two wires and BAM, worked like a champ!

Good luck..
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Old 04-16-2005, 08:50 PM   #5
agterlik
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thanks
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Old 06-12-2019, 02:19 PM   #6
Rs2.5wrx03
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Anyone have any information as to where I can find the correct pin out for the obd2 port I have a 2005 2.5rs with an 03 wrx ej20 swap that was done by someone else but can't use the obd2
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