How to Solve the Sudden Failure to Start a Mercedes-Benz C180?

[DeNolan]

Check whether the live wire entering the ignition switch has electricity. If yes, the part before the ignition switch is normal; if no, there is a fault before the ignition switch. Check whether the wire connections are loose, fallen off, corroded, or have poor contact. Fault inspection: Insert the key and turn it to the ignition position without moving it. Check whether the live wire of the starter motor solenoid has electricity. If no, the ignition switch is faulty; if yes, continue to check whether the solenoid is faulty—inspect whether the solenoid coil is open, whether the wires and connections are loose, corroded, or have poor contact, etc. Inspection steps: At the moment of powering on, check whether the dashboard, indicator lights, especially the test switch on the machine, have any response. If not, inspect the switch, battery, wiring harness, etc. If yes, proceed to the next inspection. When attempting to start, check whether the starter makes a clicking sound. If yes, inspect the starter and power supply; if no, check the wiring harness, fuse, key switch, etc. If the starter rotates normally, inspect the fuel system, high-voltage circuit, fuse, spark plugs, timing components (including the distributor, etc.), or even whether the engine requires an overhaul.