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general information
Arrangement of components of engine management systems / emission control in the engine compartment models 1993 and 1994 Vol.
 | 1 - sensor switch PAS
2 - Coolant temperature Engine
3 - PCV valve
4 - valve actuator power
5 - The MAF sensor | 6 - IAC valve
7 - The EGR valve
8 - Knock Sensor (under the exhaust manifold)
9 - TPS
10 - Camshaft position sensor (in the ignition distributor) |
Arrangement of components of engine management systems / emission control in the engine compartment model from 1995 MY.
 | 1 - sensor switch PAS
2 - The valve PCV
3 - control electromagnets
turns of fast idling and IAC valve
4 - PS
5 - The MAF sensor
6 - Intake air temperature | 7 - EGR control solenoid valves and EVAP
8 - Coolant Temperature Sensor Engine
9 - The location of the MAP sensor
10 - Knock Sensor (under the intake manifold)
11 - Camshaft position sensor (in the ignition distributor) |
In order to reduce the emission into the atmosphere of toxic components that fall into the exhaust gases of the engine as a result of evaporation and incomplete combustion of fuels as well as to maintain the efficiency of return of the engine and reduction of fuel consumption, viewed in the Guide automobiles equipped with a number of special systems that can be to unite under the name of engine management systems and reduce emissions.
Among the systems related to the engine management and control of the toxicity of the exhaust gases must include the following:
a) Electronic engine management;
b) System of catching of fuel evaporations (EVAP);
c) The system controlled crankcase ventilation (PCV);
d) Exhaust gas recirculation (EGR);
e) Catalytic converter.
Functioning of all listed systems, anyhow, directly or indirectly, related to the control of emissions reduction. The following section provides general description of the principles of operation of each of the systems and procedures set out diagnostic checks and regenerative repair (if it is possible) the individual components, the implementation of which lies within qualification of the average mechanic-fan.
Before coming to a conclusion about refusal any of systems of decrease in toxicity, carefully check the serviceability of functioning of power systems and ignition (see chap. The power supply system and release and an engine Electric equipment). Diagnosis of some of the nodes of systems of decrease in toxicity requires a special and difficult to use, equipment and certain qualification of the executor, but because it is reasonable to entrust the execution of professional engineers specialized workshop.
The foregoing does not mean that maintenance and repair of components of systems of decrease in toxicity in practice are represented difficult to achieve. Do not forget that one of the most common causes of failures is elementary infringement of quality of vacuum and electrical connections, but because, first of all, always check the condition of the choke and electrical connectors. Car owner can independently and fairly easy to make a number of checks, as well as perform at home a lot of procedures of routine maintenance of the majority of components of systems, taking advantage of the usual set of adjusting and metalwork tool.
 | Do not forget about additional federal guarantee obligations, which fall under the components of systems of decrease in toxicity and management of engine work. Before proceeding with any procedures on repair of units and parts of these systems, check on the conditions of compliance with these obligations in the executive branch of the company Nissan. |
Try to observe all specified in the following sections precautions when performing maintenance of electronic components systems under consideration. It should be noted that the illustrations may not necessarily correspond exactly to the actual placement of components on the vehicle. Such discrepancies are connected with continuously occurring process modifications within the standard design of each model.
In the engine compartment of a vehicle mounted information label of systems of decrease in toxicity of the fulfilled gases (VECI). The label contains the necessary information for setting up and testing systems controlled by taking into account all produced on the specific vehicle modifications, as well as laying the scheme of vacuum hoses with identification of various components. Before proceeding to the maintenance of systems of decrease in toxicity and management of engine work, carefully read these VECI.
| Driving laying hoses can be shown in a separate nameplate. |
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