The injection is controlled by a microprocessor (the engine control unit)
The electronic engine control unit regulates the amount of fuel supplied and controls the ignition system. Electronic engine control systems have their own advantages, which are as follows.
- A) accurate dosing of the amount of fuel in each engine operating mode, which ensures lower gasoline consumption while maintaining good dynamic performance:
- b) reduction in the amount of harmful exhaust gases as a result of precise dosing of fuel and purification of exhaust gases using a catalyst controlled by an oxygen sensor-lambda probe:
- V) self-diagnosis of the control unit, which allows you to quickly find the fault. The petrol injection system is equipped «memory», which creates a log of errors during the operation of the car. If defects occur in the ignition or injection system during operation, they are recorded in the created log. In the event of malfunctions in the injection system or the engine, a printout of the fault log can be obtained in a specialized workshop for a fee in order to independently eliminate this or that defect, if necessary.
The electronic engine control unit is a small, fast-running computer. It determines the optimum ignition timing, fuel injection timing and injected fuel volume. In this case, the unit is coordinated with units of other vehicle systems, for example, with an automatic transmission control unit.
All parts of the ignition and fuel injection systems are designed for a long service life and practically do not require repair. As part of maintenance, only the removable air filter element and spark plugs need to be changed. The main adjustment and repair work should be entrusted to specialized workshops with the necessary instruments and devices.
To avoid personal injury or damage to the fuel injection system or fuel system, the following safety precautions are recommended:
- Do not touch or remove high voltage wires while the engine is running.
- Connect and disconnect wires of systems of injection and ignition only at the switched off ignition. The same applies to the instrument leads used to make measurements on these systems.
- Persons with a pacemaker must not be allowed to work on the electronic ignition system.
- Do not inject fuel when checking compression.