The electronic control unit receives information from various sensors that monitor such engine operating parameters as the volume and temperature of the intake air, coolant temperature, engine speed, engine acceleration or braking mode, oxygen concentration in exhaust gases, etc. The signals are used by the electronic control unit to correctly determine the duration of fuel injection. Based on the data received from the sensors, the control unit determines the optimal duration of fuel injection.
In the event of a sensor failure, redundant circuitry is activated to mimic the failed sensor and maintain the vehicle's drivability until the problem is corrected. Repair and adjustment of the injection system is carried out in a car service.
Observe the following safety rules:
- always deactivate the airbag before disconnecting any connectors (see subsection 11.23), disconnect the battery from the ground;
- when installing the battery, observe the polarity of the cables;
- do not subject the parts of the electronic fuel injection system and the emission control system to strong impacts during removal or installation;
- be careful when troubleshooting (even a short-term short circuit of the connector pins can lead to incorrect test results or to the failure of one of the many circuits);
- it is forbidden to repair the processor unit on your own, or open the cover of the unit case;
- do not allow water to enter the system sensors when inspecting them during rainy weather;
- when washing the engine compartment, avoid getting water on the sensors and connectors of the injection system.