1.1. Location of elements of engine control and exhaust gas toxicity control systems 1. Manifold absolute pressure sensor (MAP); 2. Control unit (PCM); 3. Throttle block; 4. Camshaft position sensor (construction and installation work); 5. Emission control system data plate (VECI); 6. Electrovalve of the camshaft phase adjustment device - replacement; 7. Supply air temperature sensor
Through the use of an electronic engine control system, the content of unburned residues of the air-fuel mixture and fuel vapors in the exhaust is reduced. This design improves engine performance parameters and increases fuel efficiency. The control system includes the following elements and subsystems:
- Electronic engine management system
- Crankcase ventilation system
- Exhaust gas recirculation system
- Evaporative emission system
- Additional air injection system
- Catalytic converter
All of the listed subsystems, one way or another, relate to the overall system for reducing exhaust toxicity.
The subsections of this chapter include general information as well as descriptions of inspection and testing procedures that are within the competence of the automotive mechanic. Descriptions of procedures for replacing elements of all of the above subsystems are also provided.
Before making an assumption about the failure of elements of the emission control system, it is necessary to exclude malfunction of elements of the ignition and fuel injection systems. Carrying out diagnostics of most engine systems and toxicity control requires the use of specialized devices and equipment. Performing such procedures requires the mechanic to have the necessary experience. If the complexity of diagnostic and maintenance procedures is beyond the capabilities of the car enthusiast, contact a service and repair station of the appropriate level of qualification.
It should be noted that most problems in the exhaust gas control system occur due to damaged or loose connections of vacuum hoses or electrical connectors, so the test should begin with a thorough inspection of the hoses and wiring.
Although the engine management and emission control systems on newer vehicle models are extremely complex, most inspections and maintenance can be performed independently using common tools and tools, as well as relatively inexpensive measuring instruments.
Note: Before operating any emission control system components, verify the warranty period by obtaining reliable information from a source directly related to the manufacturer. After the warranty period has expired, in order to save money, you can independently perform the diagnostic and replacement procedures described in this chapter.
Strictly follow the safety requirements given in this chapter. It should be noted that there may be a discrepancy between the arrangement of elements in the illustrations and on a specific car, which is explained by the constant modifications carried out by the manufacturer during the production of this model.
Emission control system information plate (VECI) located in the engine compartment (see illustration). On the vehicle used to create this manual, this label was located on the back of the hood. Sometimes it is located on the top jumper of the radiator. The plate contains parameters for adjustment, as well as a diagram of the location of vacuum hoses and other elements. Before servicing the engine management system or emission control system, ensure that the decal is present. If there is a difference between the information on the label and this manual, the information on the VECI label must take precedence.
1.6. Emission control system information plate (VECI), located in the engine compartment, contains information about the elements of the system, the route of vacuum hoses, etc.