Also, before determining the fault, ensure that fuel is available in the fuel tank in sufficient quantity, the engine has no mechanical defects, the battery is charged and the starter turns the engine crankshaft with sufficient speed, the ignition system is working, the fuel system is tight and there are no pollution, ventilation hose crankcase clean and earthing of the power unit is securely connected.
Please check for faults recorded in the memory of the engine management system.
When working on the fuel system, remove the pre-pressure in the fuel system.
CAUSE | SOLUTION |
The engine does not start |
| When the ignition is not working electric fuel pump | Check the electrical circuit supplying voltage to the fuel pump and the electrical connectors are securely connected. |
| Faulty fuse | Check the integrity and, if necessary, replace the fuel pump fuse or motor control. |
| Faulty fuel pump relay | Check the operation and, if necessary, replace the fuel pump relay. |
| No voltage is applied to the fuel injector | Check the electric power supply circuit of the fuel injector.
|
Difficult cold start and engine running erratically |
| Defective temperature sensor | Check and, if necessary, replace the coolant temperature sensor and the temperature of the air entering the engine.
|
The engine works with faults |
| Unreliable contact in electrical connectors supply circuit of the fuel pump | Check the condition, clean and retighten contacts electrical connectors in the power supply circuit of the fuel pump.
Check and, if necessary, clean the contacts of the fuse and the fuel pump relay.
Check the performance of the fuel pump. |
| Pollution of the fuel filter | Replace the fuel filter |
| Faulty fuel pump | Check the fuel pump. |
| Defective fuel injector | Check and, if necessary, replace the fuel injector. |
Unstable work of the engine transient conditions
|
| System is leaking air into the engine | Check and, if necessary, tighten the connection of the air supply to the engine. |
| Faulty coolant temperature sensor or air entering the engine | Check and, if necessary, replace the sensor tempera ture of coolant and the temperature of the air entering the engine. |
| Leakproof fuel system | Visually inspect the fuel system for leaks. Check the connections of the fuel system. |
The complicated start of the hot engine |
| Increased pressure in the fuel system | Check the pressure in the fuel system and, if necessary, replace the fuel pressure regulator. |
| Clogged or deformed fuel return line between the fuel pressure regulator and fuel tank | Clean or replace the pipeline. |
The acceleration of the engine is delayed |
Leaky fuel injectors
| Check and, if necessary, replace the fuel injector. |
