1. Before removing any components of the injection control system, disconnect the wire from the terminal «-» battery.
Warning! Disconnect the battery only when the ignition is off.
2. Before disconnecting the components and assemblies of the fuel injection system, it is necessary to reduce the pressure in the system (see «Reducing the pressure in the power system»),
3. Do not start the engine if the wire ends on the battery are loose.
4. Never disconnect the battery from the car's on-board network when the engine is running.
5. When charging the battery, disconnect it from the car's on-board network.
6. Avoid heating the electronic control box (ECU) 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.
7. Do not disconnect or connect wire harness connectors to the ECU while the ignition is on.
8. Before arc welding on a car, disconnect the wires from the battery and the wire connectors from the computer.
9. Perform all voltage measurements with a digital voltmeter with an internal resistance of at least 10 MΩ.
10. The electronic components used in the injection system are designed for very low voltage, so they can be easily damaged by electrostatic discharge, in order to prevent damage to the computer by electrostatic discharge:
- do not touch the computer plugs or electronic components on its boards with your hands;
- when working with programmable read-only memory (PROM) control unit, do not touch the microcircuit pins.
The vast majority of fuel injection system malfunctions are caused by the failure of the following sensors:
- crankshaft position sensor (synchronization) - complete failure of the injection system, the engine does not start;
- mass air flow sensor - an increase in fuel consumption, a significant deterioration in dynamics, problems with starting the engine;
- throttle position sensor idle;
- coolant temperature sensor - difficulties with starting an engine that has not warmed up to operating temperature: you have to warm up the engine, maintaining the speed with the accelerator pedal; when overheating, power is significantly reduced, detonation appears;
- knock sensor - the engine is very sensitive to the quality of gasoline, an increased tendency to knock;
- speed sensor - the impossibility of self-learning of the system to adjust to the driving style of a particular driver. Possible deterioration of the dynamic qualities of the car in modes using maximum power (intense acceleration).