IS THERE ANY WAY TO TELL IF THE "IGT" AND "IGF CIRCUITS ARE GOOD DURING CRANKING USING COMMON SHOP INSTRUMENTS RE: TEST LAMPS, NOID LIGHTS, DUTY CYCLE, LOGIC PROBE, ETC. THE LAB SCOPE IS THE TESTER OF CHOICE TO VIEW THIS SQUARE WAVE SIGNAL,BUT MOST SHOPS STILL... Login to read more.