😰 ¿Por qué mi Chevrolet Prisma no enciende? | Relé main sin activar y códigos P0686 P0689 P1682

In this case, a Chevrolet Prisma arrived that wouldn't start. The engine cranked, but it wouldn't fire. A scan tool revealed codes P0686, P0689, and P1682, related to the ECU power supply and the main relay circuit. The curious thing is that the ECU was responding to the scanner, but the system wasn't activating correctly. During this diagnostic, we checked the power supply, main relay, power lines, and wiring until we found a hidden fault that could easily be mistaken for a damaged ECU. This is an ideal case to understand why a Chevrolet Prisma's engine can crank but it won't start, even when there appears to be communication with the scanner. Hashtags: #ChevroletPrisma #WontStart #AutomotiveDiagnostics