To start I am a pretty seasons mechanic when it come to Honda, but this one is kicking my ass. The Car is a 1998 Honda CRV EX AWD, I have had a check engine light with the cel code P1508 (IAC Valve Circuit Failure). I started with the basics and replaced the valve with a used one. I cleaned all ports in the throttle body, and manifold that lead to the IACV. That did not fix the problem, so I bit the bullet and replaced it with a new one. This did not solve the problem either. I replaced the IAT sensor after reading a couple threads that stated that sensor relates the that CEL code. This did not fix the problem either. With the new valve installed I turned the car on, and disconnected the harness going to the valve. The Idle did not change at all which leads me to believe that there may be a wiring issue. I can't seem to find a proper pinout, and wiring diagram for the 98 CRV AWD model (obd2-B?). Any help would be appreciated, this has been driving me nuts for a couple months now. The car runs great, and has no idle issues warm or cold. Thanks in advance for any info. EDIT:the engine is a JDM B20, and the only mod is the crank angle sensor bypass. I don't think this should effect the IACV, but may be relevant.