is connected to the runner control on the side of the manifold. The monitor
is connected to the actuator behind it.
With KOEO, use a multimeter to check the voltage on the following pins:
- Swirl Control solenoid
pin 1 (LB/OG wire). Should match battery voltage (12-ish V).
- Swirl Control monitor
pin 3 (BN/WH wire). Should be just over 5V.
These are the reference voltages from the PCM. If they aren't corrrect, you have an electrical short somewhere. Replacing either component will get you nowhere. If they are fine, then check Swirl Control monitor
pin 2 (GY/RD wire) for ground against pin 3.
If all of that checks out, poke a paperclip through the back of Swirl Control monitor
pin 1 (WH wire). Make sure you have continuity between the actual pin and paperclip so you can measure it while it's plugged in. When you do, plug it back in and start the engine. The voltage should be very very low. Expect a number around .125V. Now, reach under the throttle body splash shield and open the throttle plate. Get the engine up to around 3,000 RPM and look at the voltage. It should be VREF from pin 3, a.k.a. 5V.
If either of those didn't check out, try disconnecting the plug while measuring the voltage. If it changes drastically, the actuator is likely the problem. That part can either be purchased from a Ford dealer (part number 1L5Z-9L492-AC), or with a new intake manifold. Most available manifolds will specify if they include it or not.