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



Information sensors

Oxygen sensor

General description

Access to the oxygen sensor on engines of 5.2 l is very complicated. Space between the electric socket of the sensor and a final collector too for a prosovyvaniye of hands in it. Thus diagnostic check is possible only in the conditions of a workshop of dealer office or by means of the scanner.

The oxygen sensor is located in a final collector and serves for definition of the content of oxygen in the fulfilled gases. Oxygen containing in fulfilled gases influences a sensitive element of the sensor, forcing the last to develop the tension which level varies from 0,1 In (the high content of oxygen, a poor mix) to 0.9 In (the low content of the oxygen, a rich mix). RSM continuously analyzes a target signal of the sensor, determining by it the content of air in gas mixture and correcting quality of a mix by impulse management in width (duration of time) inclusions of injectors of fuel. The most optimum from the point of view of minimization of the content in the fulfilled gases of toxic components is the mix, consisting their 14.7 parts of air on 1 part of fuel. At such structure of a mix ideal conditions for effective operation of the catalytic converter are created. RSM and the oxygen sensor aspire to support constantly such share ratio of a mix (14.7 to 1).

The oxygen sensor starts to develop tension only on reaching the normal working temperature (about 320 ° C). At the initial stage (before sensor warming up) after start of the RSM engine works in a mode of the opened contour.

If after an engine warming up to normal working temperature or work it within not less than two minutes the oxygen sensor starts to develop a steady signal amplitude below 0.45 In at frequency of rotation of the engine of 1500 rpm or above, the RSM Module fixes a code 51 or 52. In case of identification of any problems in a RSM oxygen sensor contour also will establish a code 21.

At emergence of any failures of the O2 sensor or its contour of RSM automatically passes to a mode of an open contour that means podderzhivany supply of fuel in the programmed quantity without adjustment according to sensor signals.

Functioning of the oxygen sensor directly depends on four factors:

  • The electric - the Low voltage developed by the sensor, depends on purity and quality of the electric contacts which condition should be checked first of all at emergence of suspicions on refusal of functioning of the sensor.
  • Supply of external air - the Design of the sensor provides air circulation in it. Each time at removal of the sensor and its replacement before installation it is necessary to make sure of passableness of air channels.
  • Adequacy of temperature of functioning - RSM will not react to sensor signals until the temperature of the last on will reach working value about 320 ° Page. This factor surely should be taken into consideration at an assessment of efficiency of functioning of the sensor.
  • Unleaded fuel - This condition is extremely important from the point of view of serviceability of functioning of the sensor. Fill the car with only unleaded fuel.

In addition to need of performance listed above conditions at work with the sensor it is necessary to observe special precautionary measures.

  • The oxygen sensor is equipped with sockets constantly connected to it (electric and such as «a piggy tail») which should not be disconnected from it. Damage or removal of any of them is fraught with adverse effects on sensor functioning.
  • It is necessary not to allow hits in the electric socket on the site of the valve of greasing equipped with a jalousie and other pollution.
  • Do not apply to cleaning of the oxygen sensor some any solvents.
  • Address with the sensor carefully - do not strike and do not stir up it.
  • The silicon protective cover should be established correctly in order to avoid an oplavleniye and for the purpose of ensuring normal functioning of the sensor.

Check

 PERFORMANCE ORDER

  1. Find the electric socket of the oxygen sensor and insert into an opening of a black-orange wire (a wire of alarm tension) the long probe.
  1. Insert into the electric socket of the oxygen sensor the long probe and test a black-orange wire of the socket for existence of tension of a target signal. Increase engine turns, achieving increase of level of tension.
  1. Connect positive щуп the voltmeter to the probe, negative щуп earth.

Additional information on coloring of wires of the oxygen sensor can be gathered from electric circuits at the end of Head System of onboard electric equipment.

  1. Watch instrument readings (adjusted on a millivoltny scale) in the course of an engine warming up (from a cold condition).
  2. At first (at the cold engine) the oxygen sensor will develop a stable signal level near (0.1 - 0.2) In (a mode of the opened contour). About two minutes later the engine will reach normal working temperature and the voltmeter indication (a sensor signal) should start to fluctuate in limits (0.1 - 0.9) In (a mode of the closed contour). If the sensor does not enter into a mode of the closed contour, or on it leaves too long time, replace it.
  3. Also check functioning of a heater of the oxygen sensor. Disunite the electric socket of the sensor and connect between its two white wires an ohmmeter. Resistance about 5-7 Ohm should be registered.
  1. Measure resistance of the built-in heater of the oxygen sensor, having connected an ohmmeter between two white wires (the bottom plugs of the socket). It should make about 5-7 Ohm.
  1. Check food giving to a heater. Measure for this purpose tension between orange-black (+) and black-blue (-) wires of the electric socket of the oxygen sensor. At the included ignition (a key in the situation ON, the engine is not started) it should equal to tension of the battery. If a food is absent, check a contour between the main relay, RSM and the sensor.

It is important to remember that the supply voltage moves only within two seconds as the system uses the relay for a tension deviation (the relay of the conditioner of air).

  1. If the oxygen sensor does not pass any of the listed checks, replace it.

Replacement

As the oxygen sensor is established in a final collector or a reception pipe of system of production of the fulfilled gases, which when cooling are compressed, turn out it at the cold engine it can to appear very difficult. In order to avoid risk of damage of the sensor at removal (if only are not going to replace it in any case) previously start the engine for few minutes. Be careful - do not burn in the course of procedure performance about the warmed-up surfaces of components of system of production of the fulfilled gases.


 PERFORMANCE ORDER

  1. Disconnect a negative wire from the battery.
  2. To Poddomkratta the car also establish it on props.
  3. Carefully disunite the electric socket of the sensor.
  4. Accurately turn out the sensor from a final collector.
  5. For simplification of the subsequent removal of the sensor before installation grease its carving part with anti-taking hermetic. The carving of the new sensor is usually already greased with such hermetic, however in case of installation to the place of the old sensor it is necessary to cover it anew.
  6. Establish the sensor and strongly tighten it.
  7. Connect the electric socket (or a type wire «a piggy tail») to the main plait of wires of the engine.
  8. Lower the car on the earth and make its trial runs and check of record of codes of diagnostics of malfunctions.

The sensor of absolute pressure in the pipeline (MAR)

General description

The MAR sensor traces changes of pressure in the inlet pipeline, resulting changes of loads of the engine and speeds of movement of the car and will transform removed information to target tension. RSM uses the signals received from the MAR sensor for management of supply of fuel and correction of a corner of an advancing of ignition. RSM receives information in the form of peak (on tension) a signal which level can change in limits from 1.0 to 1.5 In at the closed butterfly valve (deep depression) and from 4.0 to 4.5 In at opened (weak depression). The MAR sensor is located in the box-shaped casing fixed on a partition of an impellent compartment.

Failure of the MAR sensor leads to record in memory of the module of management of a code of malfunction 13 or 14.

Check

 PERFORMANCE ORDER

  1. ON engines of 4.0 l check the vacuum hose going from the case of a throttle to the MAR sensor on existence of cracks and signs of aging of a material. In case of need make replacement. The vacuum hose of the MAR sensor is connected to the inlet pipeline. The MAR sensor on engines in volume of 5.2 l receives pipeline air from the union in a casing of the case of a throttle is connected to pipeline air via the union on the throttle case).
  2. Make sure of reliability of fastening of the electric socket of the sensor. Also check socket plugs on existence of traces of corrosion and reliability of fastening of wires to them. Examine conducting. In case of need make necessary repair.
  3. Disunite the electric socket of the MAR sensor, turn the ignition key in the situation ON (the engine do not start) and check tension on a basic wire (between violet-white (+) and weight). It should equal about 5 Century.
  1. By means of the voltmeter check basic tension on a violet-white wire (+) - it should equal about 5 Century.
  1. Connect the socket to the sensor and measure tension on an alarm wire (red-white) at the included ignition (a key in the situation ON, the engine is not started). It should lie in limits between 4.0 and 5.0 V.Eto stock-taking of the signal transferred by the sensor to RSM.
  1. Without depression (the engine is switched off) check tension on a red-white wire of the MAR sensor. It should equal approximately (4.0 - 5.0) Century.
  1. On models of 5.2 l start the engine and, having left it working at single turns, test a red-white alarm wire of the sensor positive shchupy the voltmeter. Tension should fall approximately to value in (1.5 - 2.5) In in process of razryazheniye deepening. If instrument readings do not correspond to this value, replace the MAR sensor.

On engines of 4.0 l for depression creation on the MAR sensor use the manual vacuum pump.


  1. Then start the engine and, having left it working at single turns, measure tension of the MAR sensor - it should lie within 1.5 - 2.5 In (with increase in depth of depression tension should fall).

Replacement

 PERFORMANCE ORDER

  1. On engines of 4.0 l disunite the electric socket and disconnect from the sensor a vacuum hose.
  2. Give fixing bolts and remove the MAR sensor from the throttle case (engines of 5.2 l) or a partition of an impellent compartment (4.0 l).
  1. Give bolts (shooters) of fastening of the MAR sensor to the throttle case (the engine of 5.2 l).
  1. Installation make upside-down.

Sensor of provision of a cranked shaft

General description

On cars of these models the sensor of provision of a cranked shaft serves for definition of distribution of injection of fuel in cylinders and its ignition in combustion chambers. This work is carried out also by RSM. The sensor represents the device working at effect of the Hall, established on a dome of transmission and carrying-out calculation рисок on a flywheel (RKPP) or a flexible disk (AT). If RSM ceases to receive information from the sensor of provision of a cranked shaft, the engine will stop to function.

Components of the sensor of provision of a cranked shaft - the engine of 4.0 l.

Components of the sensor of provision of a cranked shaft - the engine of 5.2 l.

Check

 PERFORMANCE ORDER

  1. Connect an ohmmeter between plugs B and C of the electric socket of the sensor of provision of a cranked shaft. Infinite resistance should be fixed.
  1. Connected between plugs B and C of the socket of the sensor of provision of a cranked shaft the ohmmeter should show infinity.
  1. If the ohmmeter shows low resistance, replace the sensor.

Replacement

Ryadny six-cylinder engine

 PERFORMANCE ORDER

  1. Disunite the electric socket of a plait of wires of the sensor of provision of a cranked shaft.
  2. On models of 1994 вып., equipped AT the sensor is fixed by means of the unique bolt And the boltovy opening of the sensor has a cut. If you plan to use further the old sensor, mark the exact provision of a bolt in relation to the sensor for a guarantee of installation them at assembly absolutely similarly. For Installation of the new sensor on demanded depth use a remote washer (enclosed in a set to the new sensor). If the gap between the sensor and a flywheel is incorrectly exposed, at start of the engine there will be a sensor damage. On all models use for sensor fastening only bolts enclosed to them as they are processed so that to provide a demanded gap between the sensor and a flywheel.
  3. Give a fixing bolt (ы) and remove the sensor.
  4. Installation make upside-down. Fixture tighten with demanded effort.

V8 engines

 PERFORMANCE ORDER

  1. Remove wires from spark plugs of the right number of cylinders. Before removal take care of accurate marking of each wire. Disconnect wires from a fixing hairpin in a back part of a cover of a head of cylinders and put them aside.
  2. Remove the thermofilter of the right final collector (Head the V8) Engine.
  3. Remove the valve and EGR tube (see an illustration). For ensuring access to a tube nut in case of need remove the block of the sensor of pressure of oil.
  4. Disunite the electric socket of a plait of wires of the sensor of provision of a cranked shaft, give fixing bolts and remove the sensor.
  5. Installation make upside-down. Fixture tighten with demanded effort.

Sensor of temperature of a cooler (CTS)

General description

The sensor of temperature of a cooler represents a termistor (the resistor which resistance changes depending on temperature). Change of resistance of the sensor by direct image influences level of tension of its target signal. With REDUCTION of temperature of the sensor its resistance INCREASES, and on the contrary. Refusal in a contour of CTS leads to record in memory of the module of a code of malfunction 22. In case of highlighting of such code during diagnostics of malfunctions of system in most cases the correct decision is replacement of the sensor or electroconducting of its contour.

Check

 PERFORMANCE ORDER

  1. For check of the sensor make measurement of its resistance at first in a cold condition (at temperature 10-27 ° About resistance of the sensor should make 17.900 - 10.800 Ohm). Then start the engine and warm up it to normal working temperature. Resistance of CTS should fall (at temperature 83-94 ° With = 1.170-820 Ohm).

Measurement of resistance of CTS on model of 4.0 l.

  1. Access to CTS on engines of 5.2 l is extremely complicated. For check of resistance of the sensor at first remove the generator, then the compressor of the conditioner of air.
  1. Check basic tension at the included ignition (without starting the engine). It should make about 5.0 Century.
  1. By means of the voltmeter check basic tension of CTS. It should make about 5.0 Century.

Replacement

Before starting performance проц2едуры wait complete cooling of the engine.


 PERFORMANCE ORDER

  1. Before installation of the new sensor wrap up its carving part a teflon sealing tape (or a tape FUM) which is urged to prevent development of corrosion and leaks on a sensor carving further.
  2. For removal of the sensor press a lock uvula and disunite the electric socket, then carefully unscrew the sensor. In order to avoid appreciable losses of a cooler as soon as possible screw the new sensor.

Address with CTS with care. Damage of the sensor is capable to affect functioning of all system of injection of fuel.


Location of CTS on engines of 4.0 l.


  1. On models of 5.2 l at first, for ensuring access to CTS, remove the generator and the compressor of central air of air.
  1. Installation make upside-down.

Sensor of provision of a butterfly valve (TPS)

General description

The sensor of provision of a butterfly valve (TPS) is located at an end face of an axis of a butterfly valve on the throttle case. By tracking of a target signal of the RSM sensor determines supply of fuel by a corner of provision of a zaslonka (copes the driver). The exit of TPS is out of operation fraught with violation of stability of injection of fuel by injectors and idling turns as RSM will believe that the zaslonka moves.

Check

 PERFORMANCE ORDER

  1. Find TPS on the throttle case.
  2. By means of the voltmeter check basic tension from RSM. Connect positive щуп the fan to violet white wire, and negative - to black dark blue. Instrument readings should equal about 5.0 Century.
  1. Measure basic tension between violet-black (basic) and black-dark blue (weight) TPS wires. It should equal about 5.0 Century.
  1. Further connect the electric socket to the sensor and measure its alarm tension. At completely closed butterfly valve connect the voltmeter between an orange-dark blue wire of the sensor and weight. Watching instrument readings, slowly open a zaslonka. At completely closed zaslonka tension of the sensor should make about 0.5 V.Na full gas tension should increase to value about 4.5 - 5.0 Century. In case of obtaining the wrong indications replace the sensor.
  1. Measure alarm tension of TPS between orange-dark blue (alarm) and black-dark blue (weight) sensor wires. At first measure tension at completely closed butterfly valve - it should equal about 5.0 Century.

  1. Then manually open a zaslonka against the stop and consider the voltmeter indication - now it should make about 3.5 - 5.0 Century.
  1. Emergence of any sort of problems in a contour of TPS leads to record in memory of the module of management of a code of malfunction 24. Immediately after input of a RSM code starts to use an artificial signal of provision of a butterfly valve that allows to restore partly operational parameters of the engine, again having increased overall performance of the last.

Replacement

 PERFORMANCE ORDER

  1. Disconnect a negative wire from the battery.
  2. Give on TPS bolts with heads of the TORX type and remove the sensor from the throttle case.
  1. Give bolts with heads of the TORX type (arrow) of fastening of TPS.
  1. At installation of the sensor track correctness of combination of directing uvulas of a nest on TPS with a zaslonka axis in the throttle case.
  1. Before the TPS installation take care of the correct combination of directing uvulas in it with an end face of an axis of a zaslonka in the throttle case (the engine of 4.0 l is shown).
TPS installation details on engines of 5.2 l.
  1. Installation make upside-down.

Air temperature sensor

General information

The sensor of air temperature is located in the inlet pipeline. Sometimes this sensor call also «the sensor of change of air temperature» or «the sensor of air temperature of the pipeline (IAT)». The sensor functions as the device with negative temperature factor (NTC) that means that at REDUCTION of temperature of the sensor its resistance INCREASES, and on the contrary. More often in case of problems in this contour their elimination needs repair or sensor replacement.

Check

 PERFORMANCE ORDER

  1. For sensor check at first measure its resistance in a cold condition (at temperature 10-27 ° About resistance of the sensor should make 17.900 - 10.800 Ohm). Then start the engine and warm up it to normal working temperature. Resistance of CTS should fall (at temperature 83-94 ° With = 1.170-820 Ohm). At the switched-off ignition (a key in the situation OFF) disunite the electric socket of the sensor of air temperature which is located on the inlet pipeline. Then by means of an ohmmeter measure resistance between two plugs of the sensor.

Check of resistance of the sensor of air temperature on the engine of 4.0 l.

Check of resistance of the sensor of air temperature on the engine of 5.2 l.
  1. Having included ignitions (but without starting the engine) measure basic tension of the sensor - it should make about 5.0 Century.

Check of basic tension of the sensor of air temperature on the engine of 5.2 l.

  1. If results of check appear negative, replace the sensor.
  2. If check did not reveal malfunctions of the sensor, and the problem on the former takes place, drive away the car in dealer office or a car-care center workshop for carrying out problem diagnostics of RSM.

Replacement

 PERFORMANCE ORDER

  1. Disunite the electric socket of the sensor of air temperature.
  2. Give fixing screws and remove the sensor from the inlet pipeline.
  3. Installation make upside-down.

Sensor of speed of the car (VSS)

General description

VSS is located or on a transfer case, or on transmission, depending on model of the car and its equipment. It represents the sensor with a rotating constant magnet which starts to develop pulse tension at excess of speed of movement of the car of value in 5 km/h (3 miles/hours). Impulses are broadcast to RSM and used for management of functioning of other systems (a food and gear shifting).

Check

 PERFORMANCE ORDER

  1. For check of VSS disunite the electric socket of a plait of wires in the neighbourhood with the sensor. By means of the voltmeter measure basic tension of the sensor - it should equal about 5.0 In (or a little more). If tension is absent, drive away the car in a workshop of dealer office for diagnostics of malfunctions of RSM.
  1. Connect positive щуп the voltmeter to basic (white-black) to a sensor wire, negative щуп - to a wire of grounding (black-blue).

Replacement

 PERFORMANCE ORDER

  1. For replacement of VSS disunite its electric socket.
  2. Give a fixing bolt and remove the sensor from transmission.

Otdavaniye of a bolt of fastening of VSS.

  1. Installation make upside-down.

Electromagnet of management of blocking

General description

The electromagnet of management of blocking represents the actuation mechanism operated by the processor which is applying to turning on of the mechanism of blocking of the converter of rotation on equipped AT cars. In more detail about check and replacement procedures see in Head Automatic transmission.

Sensor of provision of a camshaft

The description of procedures of check and sensor replacement see in Head System of electric equipment of the engine.

Sensor switch of permission of start

The description of procedures of check and sensor switch replacement see in Head the Manual box of gear shifting.