Hi, with bypass ignition, the ignition module controls spark during cranking, not the pcm. The two wires I suggested you check are fuse protected, battery voltage, use a testlite.
Above a certain rpm, the computer takes over the spark timing. Above a certain rpm, the computer sends 5 volt signal on the bypass circuit, tan wire with black tracer. That signal tells the ignition module to use the signal on the white wire for spark timing.
Sunday, December 20th, 2009 AT 9:35 AM