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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 a retsirkulyatsiya of the fulfilled gases (EGR)

In case of damage or a detachment of an electromagnet of management loss of an electric signal and the EGR valve occurs the EGR valve is stopped in open situation during the whole time of warming up and engine functioning. Symptoms of such situation are decrease in overall performance of the engine, violation of stability of turns of idling and emergence of the problems connected with operation of the car.

General description

EGR systems it is applied only on engines in volume of 5.2 l. A task it is decrease in issue in the atmosphere of oxides of nitrogen (NOH) at the expense of return of a part of the fulfilled gases via the EGR valve and the inlet pipeline in combustion chambers.

EGR valves and the electronic EGR (EET) transmitter on engines of 5.2 l.

The system of a retsirkulyatsiya of the fulfilled gases consists of the EGR valve, the antipressure transmitter with the electromagnetic valve of management of EGR (EET), the electronic module of management (RSM) and various sensors. RSM is programmed on optimum size of opening of the EGR valve under any service conditions of the engine. The sensor of extent of opening of the EGR valve defines height of lifting of the EGR valve and sends the corresponding signals on RSM. RSM compares received information to data on optimum opening of the valve which are defined on the basis of the analysis of the signals received from other sensors. If between these sizes there is a divergence, RSM gives command for operation of the electromagnetic valve of management for the purpose of reduction of depth of the depression enclosed to the EGR valve.

Check

 PERFORMANCE ORDER

  1. Start the engine and warm up it to normal working temperature.
  2. Check all hoses and EGR system tubes on existence of signs of leaks, cracks, perekruchivaniye and traces of aging of a material. Before passing to check of the EGR valve it is necessary to be convinced of sufficiency of a condition of hoses unequivocally.
  3. Check correctness of laying of vacuum hoses of EGR system (The section the General information). In case of need bring adjustments.
  4. Disconnect a vacuum hose from the EGR valve and instead of it connect the manual vacuum pump.
  1. Create depression directly on the EGR valve and make sure that the diaphragm of the valve moves up-down freely, without zakusyvaniye signs - when applying depression the engine should глохнуть.
  1. Start the engine and create on the valve depression by depth of 127 mm of mercury. Idling turns thus should fall considerably, up to an engine stop that speaks about serviceability of functioning of EGR system.
  2. If changes in frequency of rotation of the engine it is not observed, it can be a sign of failure of the EGR valve, violation of passableness of a tube of EGR or channels in the inlet pipeline or a final collector (the last can be caused by accumulation of coal deposits).
  3. Create depression on the EGR valve and observe a course of its rod. If the valve opens and closed normally, and the engine not глохнет, check channels.
  4. Connect the vacuum gage to the vacuum line of the electronic EGR (EET) transmitter, start the engine and make sure that on the EET valve depression of demanded depth is created.
  1. Measure depth of depression on the EET valve at the working engine.
  1. Also make sure available on EET of tension of the battery at the included ignition (a key in the situation ON, the engine is not started).
  1. At the included ignition (and not started engine) on the EET valve tension of the battery should take place.
    Whether
  1. lift the receiver EGR and check there are no violations of passableness of ports in the pipeline or a collector, whether tubes are deformed and whether take a place any other malfunctions. In case of need replace EGR tube.

If the EGR valve is strongly hammered by coal deposits, do not try to scratch out them - replace the valve.


  1. Lift the receiver EGR and check it on violation of passableness and existence of damages.

Replacement of components

EGR valve

 PERFORMANCE ORDER

  1. Disunite the electric socket of the electromagnetic valve of management of EGR (EET).
  2. Give two fixing nuts and remove the EGR valve. The valve acts in film the uniform block with EET.
  1. Give two bolts (arrow) in the EGR valve basis.
  1. Smooth out interfaced surfaces of the EGR valve and a nozzle.
  2. Establish the EGR valve, having replaced its laying. Strongly tighten fixture.
  3. Connect the electric socket.

Electromagnet of management of EET

 PERFORMANCE ORDER

  1. Disunite the EET electric socket.
  2. Disconnect the vacuum hoses connecting EET to the EGR valve.
  3. Take EET from an impellent compartment.
  4. Installation make upside-down.