Jeep Grand Cherokee

1993-1999 of release

Repair and operation of the car



Jeep Grand Cherokee
+ Cars of the Jeep Grand Cherokee brand
+ Settings and routine maintenance
+ Line six-cylinder engine
+ V8 engine
+ Procedures of the general and capital repairs of the engine
+ Cooling systems, heating and air conditioning
+ A 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 multiposition injection of fuel (MPFI) and information sensors - the description
   Removal and installation of the electronic module of management (RSM)
   Description of the principle of action of system of self-diagnostics and procedure of reading of codes of malfunctions
   Information sensors
   System of the operated ventilation of a case (PCV)
   System of recirculation of the fulfilled gases (EGR)
   System of catching of vapors of fuel (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 methods of operation



General information

In order to avoid pollution of the atmosphere products of incomplete combustion and evaporations, and also for the purpose of maintenance at the high level of overall performance of the engine and reduction of fuel consumption modern cars are equipped with systems of decrease in toxicity of the fulfilled gases. The following belongs to their number:

  • System of the operated ventilation of a case (PCV)
  • System of catching of vapors of fuel (EVAP)
  • System of recirculation of the fulfilled gases (EGR)
  • Oxygen sensor (O2)
  • Catalytic converter (TWC)
  • The electronic module of management (RSM) with information sensors

Sections of this Chapter included the general descriptions of a design and the principle of action of the listed systems, and also the procedures of check of their state and functioning lying within qualification of the average amateur mechanic.

Before coming to conclusion about failure of the system of decrease in toxicity of the fulfilled gases carefully check serviceability of power supply systems and ignition. Diagnostics of some of devices of systems of decrease in toxicity demands use of the special equipment and tools, and also experience of carrying out such works. If during performing procedures of service there are difficulties or there is a need of use of the special equipment, address for consultation in dealer office. Weakening of fastening or break of an electrical wiring and hoses therefore these checks have to be made first of all (see illustrations below) appears the most common cause of refusals of systems of decrease in toxicity.

However, told above does not mean at all that repair and service of components of systems of decrease in toxicity represent extremely difficult task. You can by own forces, with use of usual set of the metalwork and adjusting tool to execute many of checks and procedures of routine maintenance of components of system in house conditions.

As guarantee certificates of firm manufacturer extend to primary service of systems of decrease in toxicity of the fulfilled gases, consult about their conditions with the representative of dealer office on car sale.

The scheme of connection of vacuum components of system of decrease in toxicity of the fulfilled gases of models with engines of 4.0 l of 1993 and 1994 of the issue.

The scheme of connection of vacuum components of system of decrease in toxicity of the fulfilled gases of models with engines of 5.2 l of 1993 and 1994 of the issue.

The scheme of connection of vacuum components of system of decrease in toxicity of the fulfilled gases of models with engines of 4.0 l of 1995 of the issue (not the Californian models)

The scheme of connection of vacuum components of system of decrease in toxicity of the fulfilled gases of models with engines of 4.0 l of 1995 of the issue (the Californian models)

The scheme of connection of vacuum components of system of decrease in toxicity of the fulfilled gases of models with engines of 5.2 l of 1995 of the issue.

Special attention should be paid to observance of special precautionary measures. It is necessary to notice that illustrations to many systems can differ from the state of affairs which is really taking place on your car a little. Such divergences within one model are explained by constantly brought manufacturers of cars of modification.

Information label of systems of decrease in toxicity of the fulfilled gases (VECI) is located in a motive compartment of the car. On a label specification data and information on settings contain. At performing procedures of service of system in case of discrepancies preference always should be given to data of a label of VECI.

The label of VECI is fixed on a support of a radiator and contains information on adjustment of turns of idling, an ignition advancing corner, an arrangement of knots of systems of decrease in toxicity, laying of vacuum lines, etc.

Near VECI label on all models it is fixed Schild with the scheme of connection of vacuum components of system.