420A Idle Surging

[Skyline-Tweak]

420A. So after I pulled the engine and transmission, put it all back together and started to have idling issues. No code at first. So I started the car and pulled the IAC Motor plug. Ran the same. Then plugged it back in and it threw a code. P0505. Took the IAC Motor out. Tested it. It's good. Harness is shot. Tested with test light. Nothing frayed or melted. Anyone have a 95 420A ECU pin out to test for shorts? If no shorts come up any ideas on what it could be? Need the car for work tomorrow. Thank you in advance.

 

[Skyline-Tweak]

Okay, so I continued to mess with the IAC. I reinstalled the IAC since the motor tested fine. Manual said 38-52 Ohms. It's at 51. Tested the connector and it wasnt getting power through any of the 4 prongs. Tried to follow some wires and got lost. Looked for a pinout and can't find one. I was planning on testing it through the wires to the closest point to the ecu to see if there's a short. Now I'm wondering, if I follow the wires and if there's no power running out of the computer, then what do I do? I was told unplugging a computer from its harness resets the computer. Would that be bad?