Sign | Probable Cause | Remedy |
| The engine does not start | The engine cranks slow starter | Repair the engine starter or recharge the battery so that the starter turns the engine crankshaft with a frequency of at least 150 min -1 |
| There is no voltage in the glow plug power line | If the warning light does not show voltage when turning the key in the ignition switch to ?�ON?�, check the condition of the wiring and relays |
| Defective glow plug | Check and, if necessary, replace the spark plug |
| The air in the fuel system | Bleed the fuel system |
| The fuel pump supplies fuel not | If not supplied the fuel during engine start to loosen fuel supply tube to the nozzle, check the timing belt and the supply of fuel from the fuel filter |
| Fuel tubes are connected properly | Connect the fuel pipes |
| Incorrectly adjusted fuel injection timing | Adjust the fuel injection timing |
| Faulty Injector | Check and, if necessary, replace the nozzle |
| Defective mechanical part of the engine | Check the compression ratio and, if necessary, repair the engine |
| Faulty fuel pump | Try to start the engine with the new fuel pump and, if necessary, replace the pump. Check and, if necessary, adjust the speed of the crankshaft of the engine idling |
| Engine speed at idle irregular, rough or unstable | Leaking fuel hose from the fuel filter to the fuel pump | Securely fasten the hose |
| The air in the fuel system | Bleed the fuel system |
| Insufficient supply of fuel due to the contamination of the fuel filter or the fuel return pipe, leakage from the fuel supply tube to the nozzle, tube bend tubes or clamping connections | Inspect and, if necessary, replace pipes and hoses and replace the fuel filter |
| Faulty Injector | Check and, if necessary, replace the nozzle |
| Incorrectly adjusted fuel injection timing | Adjust the fuel injection timing |
| Defective mechanical part of the engine | Check the compression ratio and, if necessary, repair the engine |
| Faulty fuel pump | Try to start the engine with the new fuel pump and, if necessary, replace the pump. Check and, if necessary, adjust the speed of the crankshaft of the engine idling |
| Motor overload when driving in high gear | Observe the correct speed |
| Smoky exhaust (black, blue or white) | The engine is not warmed up to normal operating temperature | Check and, if necessary, replace the thermostat cooling system |
| Inadequate maximum speed of the engine crankshaft | Check and, if necessary, replace the fuel pump |
| Faulty spray nozzles | Check and, if necessary, repair or replace the fuel injectors |
| Incorrectly adjusted fuel injection timing | Adjust the fuel injection timing |
| Limited capacity of the exhaust system | Check the exhaust system in the absence of dents |
| Defective mechanical part of the engine | Check the compression ratio and, if necessary, repair the engine |
| Faulty fuel pump | Try to start the engine with the new fuel pump and, if necessary, replace the pump. Check and, if necessary, adjust the speed of the crankshaft of the engine idling |
| Reduced engine power, poor acceleration of the vehicle (speedometer in good condition, the clutch does not slip) | Inadequate maximum speed of the engine crankshaft | Check and, if necessary, replace the fuel pump |
| Dirty air filter | Clean or replace the air filter |
| Insufficient supply of fuel due to the contamination of the fuel filter or the fuel return pipe, leakage from the fuel supply tube to the nozzle, tube bend tubes or clamping connections | Inspect and, if necessary, replace pipes and hoses and replace the fuel filter |
| The air in the fuel system | Bleed the fuel system |
| Faulty spray nozzles | Check and, if necessary, repair or replace the fuel injectors |
| Incorrectly adjusted fuel injection timing | Adjust the fuel injection timing |
| Defective mechanical part of the engine | Check the compression ratio and, if necessary, repair the engine |
| Faulty fuel pump | Try to start the engine with the new fuel pump and, if necessary, replace the pump. Check and, if necessary, adjust the speed of the crankshaft of the engine idling |
| Increased fuel consumption | Dirty air filter | Clean or replace the air filter |
| Fuel leaks | Check and, if necessary, replace or tighten the connections of fuel tubes |
| Limited capacity of the fuel return pipe | Check the fuel return pipe on the absence of dents and pinched. Replace damaged tube. If the tube is clogged, blow it with compressed air and then remove the air from the fuel system |
| Faulty spray nozzles | Check and, if necessary, repair or replace the fuel injectors |
| Defective mechanical part of the engine | Check the compression ratio and, if necessary, repair the engine |
| Faulty fuel pump | Try to start the engine with the new fuel pump and, if necessary, replace the pump. Check and, if necessary, adjust the speed of the crankshaft of the engine idling |
| The engine does not stop | Not operate off switch | Repair or replace the starter switch |
| Damage to the electrical circuit between the starter switch and fuel solenoid | Replace the wiring |
