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Fault injection system
On cars used fuel injection system. Distributed injection called because the fuel is injected into each cylinder a separate nozzle. Fuel injection system reduces exhaust emissions while improving ride quality and fuel economy of the vehicle. When working with the injection system is required to follow these rules. 1. Before removing any components fuel injection systems, disconnect a wire from the plug ?�-?� the storage battery. |
A WARNING Disconnect the battery only when the ignition is switched off. |
2. Do not start the engine if the tips of the wires on the battery poorly tightened. |
3. Never disconnect the battery from the electrical system of the car with the engine running. |
4. When charging the battery disconnect it from the vehicle electrical system. |
5. Do not expose the electronic control unit (ECU) above 65 ?� C in the operating state above 80 ?� C in a non-operating (e.g., in an oven after painting). It is necessary to remove the ECU from the vehicle, if the temperature is exceeded. |
6. Do not disconnect from the computer and do not connect it to the harness connectors with the ignition. |
7. Before performing arc welding on the vehicle, disconnect the wires from the battery terminals and cables from the computer. |
8. All measurement of voltage perform a digital voltmeter, the internal resistance of which not less than 10 megohms. |
9. The electronic components used in the injection system, designed for very low power, so they can easily damage the electrostatic discharge. to prevent damage to the computer from electrostatic discharge: |
- Do not touch plugs or electronic components of the computer on its board; - When working with programmable read-only memory (PROM) of the control unit Do not touch the terminals of the chip. 10. When working in rainy weather does not allow water to electronic fuel injection system components. |
11. Check the injection carried out in the following order: |
- Check the connection with "weight" of the engine and the battery; - Check the pressure regulator, fuel filter and fuel pump; - Check fuses and relays injection system; - Check the contact pads with wires injection system. 12. Check the sensors of the injection. |
The vast majority of the fuel injection system fault is caused by its failure following sensors: - CKP sensor - a complete failure of the injection, the engine does not start; - The camshaft position sensor - intermittent operation of the engine; - The gauge of absolute pressure (vacuum) in the intake manifold - an increase in fuel consumption, a significant worsening of the dynamics, problems with starting the engine;
NOTE Intake air temperature sensor is built into the gauge of absolute pressure in the intake manifold, its failure results in increased fuel consumption and emissions. |
- Throttle position sensor - loss of power, jumps and dips during acceleration, unstable work idling; - The coolant temperature sensor (installed on the thermostat) - difficult to start in cold weather: it is necessary to warm up the engine while maintaining the momentum of the accelerator pedal; overheating is considerably reduced power, there is a detonation; - Concentration of oxygen sensors (lambda probe) - increase in fuel consumption, reduced engine power, unstable idling may damage the catalytic converter; - Speed sensor (mounted on the gearbox) - possibly worsening the dynamic qualities of the car and increase fuel consumption.
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