I have a no start situation. I only have 3volts at the PCM and starting circuit why?

Hello, I do not agree about 13 volts -- your battery will typically provide between 12.4 - 12.7 volts when fully charged, and that's what your vehicle needs. Amperage should be much higher in cranking power. If you are saying you have 3 volts, I would question the voltage drop - is the engine's battery fully charged and able to sustain a load? Are battery cables clean and secure, as well as terminals clean and secure? If you have 12 volts at the battery and 3 volts at the PCM then obviously something is happening between the two points. If you need guidance, work with a shop near you. This should boil down too basic electrical testing, as evidenced by "jumping the relay" being successful in itself. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.