RB25 ecu codes 51 & 21, different?

RBRAY

NKOTB
Exactly what the title says. I swaped out my "running" rb20 for a rb25, Everything seems to be working fine except that I have no spark. I'm getting a code 21 off of the ecu. All the code list I can find have both code 21 and 51 as "Ignition system." Is there anyway to narrow it down farther than that?

---------- Post added at 07:19 PM ---------- Previous post was at 07:15 PM ----------

Never mind, 51 is "Injector circut " Still... any advice as to where to start looking?

---------- Post added at 07:20 PM ---------- Previous post was at 07:19 PM ----------

Never mind, 51 is "Injector circut " Still... any advice as to where to start looking?
 
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