I have a 2003 Dodge 4.7. Got a code p0509 today. IAC valve. Cleared the code, unhooked the IAC and restarted the engine. Came back with both P0508 and P0509. Have been looking around trying to do more tests. Big problem. All Ive found have been for an IAC with a 4 wire . Mine only has 2. The gray/red and yellow and black. Both have good connectivity from PCM to IAC. Ground test gave me 5 ohms on and red. 10 to 15 ohms on the yellow and black. I found a brown and white wire on the PCM. One of the two other wires that everyone refers to. Was going to check PCM by clipping the wires to check for short. But no violet and black wire to be found. Guessing short to ground on the yellow and black wire. But not sure. Any suggestions on what to try next? Or if its the PCM