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Nissan Maxima QXsince 1993 of releaseRepair and car operation |
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Nissan Maxima QX + Nissan Maxima brand Cars + Maintenance instruction + Settings and routine maintenance + Engine + Systems of cooling, heating + Power supply system and release + engine Electric equipment - Control systems of the engine General information System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions Removal and RSM installation Check of serviceability of a condition, replacement and adjustment of the sensor of provision of a butterfly valve (TPS) Check of a condition and replacement of the sensor of measurement of weight of an air stream (MAF) Check of a condition and replacement of the sensor of absolute pressure in the pipeline (MAR) Check of a condition and replacement of the sensor of temperature of soaked-up air (IAT) Check of a condition and replacement of the sensor of temperature of cooling liquid of the engine (eats) Check of a condition and replacement of the sensor of provision of a cranked shaft (SKR) Check of a condition and replacement of the sensor of provision of a camshaft (SMR) Check of a condition and replacement of the sensor switch of pressure in system of hydrostrengthening of a wheel (PSP) Check of a condition and replacement of the oxygen sensor (l-probe) Check of a condition and replacement of the sensor of a detonation Check of a condition and replacement of the sensor of temperature of fuel of speed of movement of the car (VSS) Check of a condition and replacement of the sensor of speed of movement of the car (VSS) Check of a condition and replacement of components of system of stabilization of turns of idling Control system of functioning of the capacity valve System of operated ventilation of a case (PCV) System of a retsirkulyatsiya of the fulfilled gases (EGR) - the general information, check of a condition and replacement of components System of catching of fuel evaporations (EVAP) - the general information, check of a condition and replacement of components The catalytic converter - the general information, check of a condition and replacement + Transmission + Coupling and power shafts + Brake system + Suspension bracket and steering + Body + Onboard electric equipment |
Check of a condition and replacement of the oxygen sensor (l-probe) General informationLocated in a final path of the engine the l-probe traces the content of oxygen in a stream of the fulfilled gases. At contact of molecules О2 to a sensitive element of a probe the sensor develops a peak signal in a range from 0.1 to 0.9 In, depending on concentration of oxygen. And, to value 0.1 In there corresponds high contents О2 (the grown poor mix), and to value 0.9 In - low (the enriched mix). The Verkhnepotochny oxygen sensor gives out on RSM supplies the module of management with information on residual contents О2 in system of production of the fulfilled gases. RSM continuously supervises a signal arriving from the oxygen sensor, in case of need giving out commands for correction of structure of an air and fuel mix at the expense of change of duration of opening of injectors of injection. The optimum ratio of components of the gas mixture, guaranteeing the minimum fuel consumption at the most effective functioning of the catalytic converter, makes 14.7 parts of air on 1 part of fuel, - its module of management and tries to support constantly, being guided by information arriving from a l-probe. The Nizhnepotochny l-probe does not influence process of configuration by the module of management of an air and fuel mix. On a design and a functioning principle the sensor is identical to the verkhnepotochny. By comparison of level of the content of oxygen on sites of a final path is higher and below the RSM catalytic converter defines efficiency of functioning of the last. Remark: On models 1993 and 1994 of вып. one oxygen sensor (verkhnepotochny) is used only. On models since 1995 вып. two verkhnepotochny l-probes (on one on each of ranks of cylinders) and one nizhnepotochny are provided. It should be noted that the oxygen sensor is capable to develop alarm tension only being heated-up to normal working temperature (318°С). While the sensor is in a cold condition, RSM works in a mode of the OPENED CONTOUR, exercising administration of configuration of an air and fuel mix on the basis of the base parameters put in it. Serviceability of functioning of the oxygen sensor depends on performance of set of some certain conditions: a) Electric parameters: Stability of a peak signal of a low voltage developed by the sensor in big degree depends on quality of contact connections of a chain of a l-probe which should be checked first of all in case of problems; b) Supply of external air: The design of a l-probe provides free circulation of external air in the sensor. At probe installation always check passableness of air channels; c) Working temperature: RSM starts to react to information arriving from a l-probe only after the sensor will be heated-up to normal working temperature (near 320°С). It is necessary not to lose sight of this fact at check of serviceability of functioning of a probe; d) Quality of fuel: Serviceable functioning of a l-probe becomes possible only under condition of application for filling of the car of UNLEADED fuel! In addition to the conditions listed in the previous paragraph at service of a l-probe it is necessary to observe some special precautionary measures: a) The oxygen sensor is equipped with the equipped contact tip tightly built-in in it an electroconducting piece, performance of which attempts of a detachment can lead to an irreversible exit of a probe out of operation; b) Try not to allow hits in a jalousie of the sensor or its electric socket of dirt and greasing; c) Do not use for cleaning of the oxygen sensor any solvents; d) Address with a l-probe extremely carefully, do not drop it and try not to shake; e) The silicone protective cover should put on on the sensor strictly definitely not to be melted and not to break serviceability of functioning of a probe. In case of violation of serviceability of functioning of a l-probe or its chain of RSM passes to a mode of the opened contour, ignoring information arriving from sensors and supporting structure of an air and fuel mix at some set level providing sufficient efficiency of return of the engine. CHECK
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