Nissan Maxima QX

since 1993 of release

Repair and car operation

System of catching of fuel evaporations (EVAP) - the general information, check of a condition and replacement of components

General information

The EVAP system accumulates accumulating in a power supply system during car parking fuel evaporations and provides a conclusion them to the inlet highway for burning in the course of normal functioning of the engine. The structure of any EVAP system surely includes the special adsorber filled with absorbent carbon which, actually, and collects in itself fuel evaporations. The adsorber is connected by tubes to a fuel tank, besides, the design of system provides giving possibility in a depression adsorber from inlet port of the engine and the inlet pipeline

When the engine is muffled, accumulating in a fuel tank, the case of a throttle and the inlet pipeline fuel evaporations on connecting tubes are deduced in a coal adsorber where are stored till engine start. At engine start the adsorber is blown and the evaporations which have accumulated in it are taken away to the inlet highway, from where arrive in combustion chambers.

On models 1993 and 1994 of вып., and also on models of 1995 вып, federal legislations getting under action, the vacuum valve switch of management by a purge it is established from above on an adsorber. On the Californian models of 1995 вып. and all models since 1996 вып. the electronic valve of management by the adsorber purge, working at the command of RSM is used. The structure of an electronic control system includes also locking valve, allowing to stop an adsorber purge on single turns and during braking by the engine.

CHECK

PERFORMANCE ORDER

1. Faulty functioning of the valve of an uparvleniye by a purge, and also mechanical damage of a coal adsorber or connecting lines conducts to violation of stability of turns of idling, spontaneous остановам the engine and to decrease in efficiency of its return.
2. At the increased fuel consumption, and also at emergence of a distinct smell of the gasoline getting into salon of the car, it is necessary to check a condition of fuel lines first of all. Make sure of lack of signs of mechanical damage of an adsorber.
3. Check a condition of the hoses brought to an adsorber. Execute necessary replacements.
4. The burst adsorber replace (see below).
5. Make sure of lack of traces of leaks under a coal adsorber. In case of need replace the failed assembly. track correctness of connection and laying of hoses.

Replacement of a coal adsorber

All models 1993 and 1994 of вып. and federal models of 1995 вып.

PERFORMANCE ORDER

1. Carefully mark and disconnect all vacuum hoses brought to an adsorber.

2. Turn out fixing bolts and remove an adsorber from a basic arm.

3. Installation is made upside-down.

Californian models of 1995 вып. and all models since 1996 вып.

PERFORMANCE ORDER

On these models the coal adsorber of EVAP is located in the left part of the car, behind a fuel tank.

1. To Poddomkratta the car also establish it on props.
2. Carefully mark and disconnect from an adsorber all vacuum lines.
3. Turn out fixing bolts and remove an adsorber.
4. Installation is made upside-down.