I'm currently experiencing some issue with my secondary inj, I believe the culprit is the Injectors driver.
After a little research, seem like there are not a lot of detail/info on Power FC driver identification on which driver is which, and location.

I came across another post mention that - Location A - NEC UPA1556AH is responsible for the injectors driver.
By any chance does anyone else know what are these other driver for?






A) NEC UPA1556AH - INJECTORS DRIVER
B) NEC UPA14748H
C) NEC UPA1500BH
D) NEC UPA14748H
E) NEC UPA14748H
F) NEC UPA14748H
G) NEC UPA14748H
H) 3F46 HC240
I) 0338H 74HC4094A
J) 0338H 74HC4094A
K) 3L36 HC165
L) 3H46 HC00
M) SIMTEK STK12C68-S451 0341 AF2761C
N) 0342H 74HC126A
O) 0330H 74HC573A
P) NEC JAPAN 78F4046GC D339EY002

 

Probably some of the other outputs the ECU has - fuel pump, ISC, etc.

Michael Gagne in Canada can test and repair PFC's for a fair price and fast turnaround. He's on the FB RX-7 group all the time, he also does cluster repairs. He actually built a setup that can fully test the PFC.

Dale

 

I did look at his setup, his price isn't bad actually. But the concern is shipping to Canada atm.

 

As I mentioned in your previous thread, youre in Arlington which means youre within driving distance of Rotary Performance who can fix Apexi Power FC drivers that way you dont have to ship it to Canada.

 

To find where those driver chips connect, just use a multimeter and check which drivers connect to solenoid pins on the ECU header. They are probably controlling turbo control solenoids, idle solenoid, emissions solenoids, etc. The FD has something like a dozen solenoid outputs, they are all called out in the factory service manual and in the wiring diagram.