When trying to start the engine, the crankshaft does not rotate
1. Engine starting is blocked by the anti-theft system (immobilizer). The ignition key code is not recognized, the immobilizer indicator lamp on the instrument panel is flashing (see "Instrument panel"). The engine cannot be started if an unregistered ignition key is used, and in a vehicle with an "electronic key" it is impossible to turn on the ignition. If the "native" car key is used, foreign objects that may interfere with reading the code should be removed from the ignition key and ignition switch (a bunch of other keys, a keychain, etc.). If after this the engine start remains blocked, you should contact a specialized service station. There may be a radiation source near the vehicle that is preventing the ignition key from being recognized. In this case, if the car is towed out of the radiation zone, the engine can be started.
2. The terminals on the battery terminals are not tightened sufficiently or are oxidized. Check the condition of the terminals, clean them if necessary and tighten the fastening nuts (see "Battery").
3. The battery is discharged or faulty. Check the battery condition, charge it, replace the faulty one. After connecting the terminals, cover them and the battery terminals with a special compound or any plastic lubricant (see "Battery").
4. The starter electrical circuit is faulty. Check the power supply circuit, the condition of the electrical connections (see "Starter"), Replace damaged wires, clean oxidized tips and terminals, treat with a cleaning and protection agent for electrical contacts. Tighten the threaded connections in accordance with the specified tightening torque.
5. The starter solenoid relay is faulty. Replace the faulty relay or starter assembly (see "Starter").
6. Starter is faulty. Repair it or replace it (see "Starter").
7. The ignition switch (lock) is faulty. Replace the faulty part.
The crankshaft rotates but the engine does not start (the engine starts but stops immediately)
1. Engine starting is blocked by the immobilizer. Disable the car's security system. If after this the engine start remains blocked, you should contact a specialized service station.
2. There is no fuel in the tank (check the fuel level sensor readings, replace it if faulty).
3. The crankshaft does not rotate fast enough to start the engine due to a low battery charge or oxidized terminals on its terminals. Check the condition of the terminals, clean them if necessary and tighten the fastening nuts. Check the battery condition, charge it, replace the faulty one (see "Battery"). After connecting the terminals, cover them and the battery terminals with a special compound or any plastic grease.
4. Malfunction of fuel supply system components. Inspect the fuel supply system for leaks, check the pressure in the fuel supply system, check the malfunction of the fuel injectors and fuel module (see "Power supply system - technical condition check"). Replace faulty parts.
5. Leaky connections of the intake manifold. Replace the seals in the intake manifold connectors.
6. The engine management system is faulty. Perform diagnostics of the engine management system (see "Checking the technical condition of the engine management system"). Replace faulty elements.
7. The ignition coil or its electrical circuit is faulty. Check the power supply circuit and the condition of the electrical connectors. Treat oxidized terminals with a cleaning and protection agent for electrical contacts. Perform diagnostics of the engine management system (see "Checking the technical condition of the engine management system"). Replace the faulty part.
8. The crankshaft position sensor is faulty (see "Crankshaft Position Sensor - Replacement").
9. Low compression in engine cylinders. Checked the technical condition of the engine (see "Engine - technical condition check"). Repair the engine by replacing worn and faulty parts.