So, my S4 TII swap has been complete for some time now. Like everyone else with the Power FC, I've removed the AFM. Only one problem... I am forced to jumper the AFM's ground (E1 terminal) and fuel pump switch (Fc terminal) on the circuit opening relay to keep the car running. (Fuel pump runs with key to "ON".)

Has anyone else had this problem? If so, what did you do to fix it??

 

I think that I actually found my answer.

Since I have the Banzai adapter:

Connect the 3' unterminated wire on the adapter marked COR to the BROWN wire on the orange connector (X-16 in the FSM Pic # 5) located behind the passenger-side kick panel.
Ensure that you connect the COR wire to the dash harness side not to the engine harness side. This is necessary to trigger the circuit opening relay.

How I missed this before?... I obviously didn't read the installation directions thoroughly.

 

Yeah, that's the trick.

Here's the deal. On the s5, the ECU controlled the fuel pump. The s5 had a different style AFM. On the s4, the AFM was part of the fuel pump control system and the ECU didn't do anything. This was common on the Bosch and Denso fuel injection systems that were comparable to what Mazda used in the s4 cars.

When you install a PFC into a series 4, you are using the fuel pump control from the Power FC and tapping it into the wire that normally carried the signal from the AFM.

 

I'm really glad I found all of the answers I needed. The search function DOES work... But sometimes you have to look in the "wrong places".

It was a pain to have the circuit opening relay jumpered to a switch in order to run my car.

 

No reaon for a search function if you just read our installation instructions in order. Step #7, there is a reason the wire is tagged "COR" = circuit opening relay.

http://www.banzai-racing.com/S4_PFC_install.htm