Nissan Maxima QX

since 1993 release

Repair and operation of the car

General information

The scheme of an arrangement of components of control systems of engine/decrease in toxicity of the fulfilled gases in a motive compartment of models 1993 and 1994 of of the issue.


1 — the PAS Sensor switch 2 — the Sensor of temperature of cooling liquid of the engine 3 — the PCV Valve 4 — the Actuation mechanism of the valve of power 5 — the MAF Sensor	6 — the IAC Valve 7 — the EGR Valve 8 — the detonation Sensor (under a final collector) 9 — TPS 10 — the Sensor of position of the camshaft (in the ignition distributor)

The scheme of an arrangement of components of control systems of engine/decrease in toxicity of the fulfilled gases in a motive compartment of models since 1995 of the issue.


1 — the PAS Sensor switch 2 — лапан PCV 3 — Electromagnets of management turns of bystry idling and IAC valve 4 — PS 5 — the MAF Sensor 6 — the Sensor of temperature of the soaked-up air	7 — Electromagnetic valves of management of EGR and EVAP 8 — the Sensor of temperature of cooling liquid of the engine 9 — Location of the MAR sensor 10 — the detonation Sensor (under the inlet pipeline) 11 — the Sensor of position of the camshaft (in the ignition distributor)

For the purpose of decrease in level of issue in the atmosphere of the toxic components getting into composition of the fulfilled engine gases as a result of evaporation and incompleteness of combustion of fuel and also for maintenance of efficiency of return of the engine and decrease in fuel consumption, the cars considered in the present manual are equipped a number of special systems which could be united under the general name of control systems of the engine and decrease in toxicity of the fulfilled gases.

It is necessary to carry the following to number of the systems concerning management of operation of the engine and control of toxicity of the fulfilled gases:

a) System of electronic control by the engine;
b) System of catching of fuel evaporations (EVAP);
c) System of the operated ventilation of a case (PCV);
d) System of recirculation of the fulfilled gases (EGR);
e) Catalytic converter.

Functioning of all listed systems, anyway, directly or indirectly, is connected with management of decrease in toxicity of the fulfilled gases. In the Sections given below the general descriptions of the principles of functioning of each of systems are given, and also procedures of diagnostic checks and recovery repair (if that is obviously possible) separate components which performance lies within qualification of the average amateur mechanic are stated.

Before coming to conclusion about refusal of toxicity, any of systems of decrease, attentively check serviceability of functioning of power supply systems and ignition (see Chapters of the Power supply system and release and engine Electric equipment). Diagnostics of some of knots of systems of decrease in toxicity demands use special, difficult in application, the equipment and a certain qualification of the performer, and therefore, its performance will be reasonable to charge to professional mechanics of specialized car repair shop.

Told above does not mean that service and repair of components of systems of decrease in toxicity in practice are represented exigeant. Do not forget that one of the most common causes of refusals is elementary violation of quality of vacuum or electric connections, and therefore, first of all it is always necessary to check a condition of nipple and electric sockets. The owner of the car can independently and it is rather easy to make a number of checks, and also, to perform a set of procedures of routine maintenance of the majority of components of systems in house conditions, using at the same time a usual set of the adjusting and metalwork tool.

Do not forget about additional federal guarantee certificates under which components of systems of decrease in toxicity and management of operation of the engine get. Before starting implementation of any procedures on repair of knots and details of these systems, consult about conditions of observance of these obligations in representative office of the Nissan company.

Try to observe everything the measures of precautions stipulated in the following Sections when performing service of electronic components of the considered systems. It is necessary to notice that illustrative material can not always correspond in accuracy to real placement of components on the car. Such discrepancies are connected with continuously happening process of modification within a standard design of each model.

Information label of systems of decrease in toxicity of the fulfilled gases (VECI) is fixed in a motive compartment of the car. On a label necessary information on settings and checks of under control systems taking into account all modifications made on the concrete car, and also the scheme of laying of vacuum hoses with identification of various components contains. Before starting service of systems of decrease in toxicity and management of operation of the engine, attentively study data of VECI.

The scheme of laying of hoses can be provided on separate Schild.