Jeep Grand Cherokee

1993-1999 of release

Repair and car operation



Jeep Grandee Cheroki
+ Jeep Grand Cherokee brand Cars
+ Settings and routine maintenance
+ Ryadny six-cylinder engine
+ V8 Engine
+ Procedures of the general and major maintenance of the engine
+ Systems of cooling, heating and air conditioning
+ the Power supply system and production of the fulfilled gases
+ System of electric equipment of the engine
- Systems of decrease in toxicity of the fulfilled gases and engine management
   General information
   System of multiitem injection of fuel (MPFI) and information sensors - the description
   Removal and installation of the electronic module of management (RSM)
   Description of a principle of action of system of self-diagnostics and procedure of reading of codes of malfunctions
   Information sensors
   System of operated ventilation of a case (PCV)
   System of a retsirkulyatsiya of the fulfilled gases (EGR)
   Catching system паров fuels (EVAP)
   Catalytic converter
+ Manual box of gear shifting
+ Automatic transmission
+ Transfer case
+ Coupling and transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ System of onboard electric equipment
+ Governing bodies and operation receptions



System of operated ventilation of a case (PCV)

Models with engines in volume of 4.0 l are equipped with system of continuous (uncontrollable) ventilation of a case (CCV). This system functions in the same way as well as usual operated (PCV), however the management valve is not switched on in its structure. Instead the formed vacuum tube is connected to depression of the inlet pipeline on a cover of a head of cylinders in turned to salon of the car of the party of the engine.

In a tube the calibrated jet of the fixed size is built in. The jet serves for definition of amount of karterny gases removed from the engine. The hose of supply of fresh air from an air purifier is connected to a forward part of a head of cylinders on a cover of a head of cylinders. At operation of the engine air is forced in the engine where mixes up with karterny evaporations. At the expense of depression of the inlet pipeline the mix of air and karterny evaporations is pumped over through the calibrated jet and deduced in the pipeline, from where gets to combustion chambers where it is destroyed.

The system of operated ventilation of a case (PCV) allows to reduce issue in the atmosphere of hydrocarbonic connections at the expense of destruction of karterny evaporations. It is made by implementation of circulation of fresh air from an air purifier through an engine case where it (air) mixes up with karterny gases and via the valve of management (PCV) is deduced in the inlet pipeline.

PCV system of engines of 4.0 l

1 — the Coal adsorber
2 — the Air purifier
3 — the Vacuum union
4 — the Regulator of pressure of fuel
5 — fuel Injectors
6 — the Calibrated jet
7 — the MAR Sensor
8 — the Fuel highway
9 — the Inlet pipeline
10 — TPS
11 — pipeline Unions
12 — the Motor of system of stabilization of turns of idling (the valve of additional air) (IAC)
13 — the Hose of giving of clean air
14 — Assembly of a vacuum tube
15 — the air temperature Sensor

PCV system of the engine of 5.2 l.

PCV valve of engines of 5.2 l.

The main components of PCV system are the valve of management (PCV valve), the filter of karterny gases and the vacuum hoses serving for connection of these components with the engine.

For maintenance of quality of turns of idling the PCV valve locks a conclusion of gases from a case at deep depression in the pipeline. At emergence of violations in engine functioning (for example emergence of problems with piston rings) a design of system allows to carry out the conclusion of karterny gases on a ventilating tube in an air purifier, from where a mix gets to chambers of combustion and is destroyed in the course of normal operation of the engine.

The description of procedures of check and replacement of the PCV valve is provided in Head of Control and routine maintenance.