94 Lexus ES300 will crank but not start, what could be causing this issue?

Backprobe and check for good battery voltage to the igniter on the Black/Orange wire with the key on. Backprobe and check the ground for the igniter on the White/Black wire - look for 0.05 volts or less. Backprobe and scope the Ignition Trigger (IGT) wires at the igniter and look for 0-5 volt squarewaves while cranking. Backprobe and scope the IGF wire (White/Red wire) at the igniter and look for a 0-5 volt pattern while cranking. If there is no 0-5 volt squarewave signal on the IGT wires at the igniter, scope the Red wire at the Crankshaft Position (CKP) sensor and look for a good AC sine wave signal while cranking possible causes Crankshaft Position (CKP) Sensor or Igniter