Possible electrical problems that lead to the machine not starting:
Battery
* Discharged or defective
* Poor connection at terminals
*Corrosion on terminals
Starter
*Faulty solenoid or starter motor
* Poor connection or damaged wiring
* Worn brushes or solenoid relay
Ignition switch
*Faulty switch or wiring
* Stuck key or damaged cylinder mechanism
Spark plugs
*Dirty or defective
* Poor wiring connection
Fuel pump
* Faulty pump
* Poor connection or damaged wiring
Crankshaft position sensor
* Faulty sensor
* Poor connection or damaged wiring
Engine control module (ECU)
* Faulty ECU
* Poor connection or damaged wiring
How to fix the problem:
1. Check the battery: Measure the voltage using a multimeter or voltmeter. Connections must be clean and secure.
2. Inspect the starter: Check for sparking at the starter terminals when turning the ignition key. If there is no sparking, the starter is faulty.
3. Check the ignition switch: Try turning the key in the lock several times and listen for clicks. If there is no click, the lock is faulty.
4. Check the spark plugs: Remove the spark plugs and inspect them for carbon deposits or damage.
5. Check the fuel pump: Turn the ignition switch on and listen for a whirring sound from the fuel pump. If there is no buzzing sound, the pump is faulty.
6. Check the crankshaft position sensor: Check the condition of the sensor and its connections. A faulty sensor may prevent the engine from starting.
7. Check the ECU: A faulty ECU can cause a variety of problems, including the engine not starting. It is necessary to carry out diagnostics using a fault code scanner.
If you cannot fix the problem yourself, contact a qualified mechanic for help.