Mercedes Benz Vito W638 Wiring Diagram 🆕 Verified Source

– The diagram shows this relay is triggered by the ECU only when the engine is cranking. If you have no fuel pressure, the diagram helps you bridge pins 30 and 87 on the relay socket to test the fuel pump directly.

Let’s look at real-world scenarios where the wiring diagram saves the day. Mercedes Benz Vito W638 Wiring Diagram