My 1991 900S N/A abrutly stopped running last week on the road and will not start. Engine turns over, initial spark at plugs when starter first engaged-then no spark. Pulled error code 12231 (No Ign signal) & 12254 (no RPM Signal). I used Bentley and Townsend checks to narrow down the problem. All fuses, grounds, knock sensor, amp, crank sensor are good, Fuel pump works when jumped but does not run when starter engaged. Ignition relay checks good. Checking across Fuel relay socket terminals #86 & 85 while cranking produces no voltage, 12V normal. Bentley says LH ignition signal missing. Checking across LH terminals 1 & 17 while cranking produces a high voltage 22(VAC), 6.5 is normal. Any ideas where to proceed from here?