If the ECM has no power: 👉 Nothing works No fuel ❌ No spark ❌ No communication ❌ 👉 Before blaming the ECM, always check: 👉 Power supply 🧠 How ECM Gets Power The ECM needs: ⚡ 1. Battery Power (Constant) 🔑 2. Ignition Power (Switched) 🔌 3. Ground Connection 👉 All three must be … Continue reading How to Check ECM Power Supply (Complete Diagnostic Guide)