1. Check up reliability of all connections with weight. Check system wiring and connectors. Loose electrical connections and poor ground contact can be the cause of many faults that are seen as serious failures.
2. Check the state of charge of the battery. The normal operation of sensors and actuators for fuel dosage depends on the supply voltage.
3. Check the condition of the air filter.
4. If a blown fuse is found, replace it and check the operation of the related circuit. If the fuse blows again, look for a wire shorted to ground in the wiring.
5. Check the tightness of the air duct.
6. Remove the air duct from the damper body and check for tar deposits and carbon deposits.
7. With the engine running, apply a stethoscope (or screwdriver) to each of the injectors and listen for characteristic clicks indicating the normal operation of the injectors.
8. If necessary, you can use the indicator light.
9. Check the resistance of each injector.
10. The rest of the checks should be performed at a car service.