The fuel injection system, in combination with a catalytic converter in the exhaust system, reduces the toxicity of exhaust gases while improving the vehicle's driving characteristics.
This chapter provides only a brief description of the general principles of the design, operation and diagnostics of fuel injection systems, the procedure for removing and installing components, and also provides features for repairing the engine itself. The device, repair and diagnostics of the system using special devices and diagnostic cards are described in detail in a separate "Repair Manual for Central Fuel Injection System".
Attention! Before removing any components of the injection control system, disconnect the wire from the terminal (-) battery.
Attention! Do not start the engine if the cable lugs on the battery are loose.
Attention! Never disconnect the battery from the vehicle's electrical system while the engine is running.
Attention! When charging the battery, disconnect it from the on-board network, the car.
Attention! Do not expose the electronic control unit (ECU) temperature above 65°C in working condition and above 80°C in non-working condition (e.g. in a drying chamber). It is necessary to remove the computer from the car if this temperature is exceeded.
Attention! Do not disconnect or connect the wiring harness connectors to the ECU while the ignition is on.
Attention! Before performing arc welding on a vehicle, disconnect the wires from the battery and the wire connectors from the ECU.
Attention! Make all voltage measurements with a digital voltmeter with an internal resistance of at least 10 MΩ.
Attention! The electronic components used in the injection system are designed for very low voltage and can therefore be easily damaged by electrostatic discharge. To prevent damage to the ECU by electrostatic discharge:
- do not touch the computer plugs or electronic components on its boards with your hands;
- when working with the PROM of the control unit, do not touch the pins of the microcircuit.