Jeep Grand Cherokee

1993-1999 of release

Repair and car operation



Jeep Grand Cherokee
+ Cars of mark Jeep Grand Cherokee
+ Options and routine maintenance
+ Рядный the six-cylinder engine
+ Engine V8
+ Procedure of the general and engine major repairs
+ Systems of cooling, heating and air conditioning
+ The power supply system and release of the fulfilled gases
+ System of an electric equipment of the engine
- Systems of decrease in toxicity of the fulfilled gases and engine management
   The general information
   System of multiitem injection of fuel (MPFI) and information gauges - the description
   Removal and installation of the electronic module of management (РСМ)
   The description of a principle of action of system of self-diagnostics and procedure of reading of codes of malfunctions
   Information gauges
   System of operated ventilation картера (PCV)
   System recycling the fulfilled gases (EGR)
   System of catching of steams of fuel (EVAP)
   The Katalitichesky converter
+ Manual box of a gear change
+ Automatic transmission
+ Distributing box
+ Coupling and трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ System of an onboard electric equipment
+ Controls and operation receptions

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Information gauges

The oxygen gauge

The general description

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

The oxygen gauge is located in a final collector and serves for definition of the maintenance of oxygen in the fulfilled gases. Oxygen containing in fulfilled gases influences a sensitive element of the gauge, forcing last to develop the pressure which level varies from 0,1 In (the high maintenance of oxygen, a poor mix) to 0.9 In (the low maintenance of the oxygen, a rich mix). РСМ continuously analyzes a target signal of the gauge, defining on it air maintenance in a gas mixture and correcting quality of a mix by impulse management in width (duration of time) inclusions of injectors of fuel. The optimal from the point of view of maintenance minimisation in the fulfilled gases of toxic components is the mix, 14.7 parts of air consisting them on 1 part of fuel. At such structure of a mix perfect conditions for effective work каталитического the converter are created. РСМ and the oxygen gauge aspire to support constantly such share parity of a mix (14.7 to 1).

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

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

At occurrence of any refusals of gauge O2 or its contour РСМ automatically passes in a mode of an open contour that means поддерживание fuel givings in the programmed quantity without updating according to gauge signals.

Functioning of the oxygen gauge directly depends on four factors:

  • Electric - the Low voltage developed by the gauge, depends on cleanliness and quality of the electric contacts which condition should be checked first of all at occurrence of suspicions on refusal of functioning of the gauge.
  • Givings of external air - the gauge Design provides air circulation in it. Each time at removal of the gauge and its replacement before installation it is necessary to make sure of passableness of air channels.
  • Adequacy of temperature of functioning - РСМ will not react to gauge signals until the temperature of the last on will reach working value nearby 320 ° With. The given factor necessarily should be taken into consideration at an estimation of efficiency of functioning of the gauge.
  • Neetilirovannoe fuel - the Given condition is extremely important from the point of view of serviceability of functioning of the gauge. Fill the car only неэтилированным with fuel.

In addition to necessity of performance listed above conditions at work with the gauge it is necessary to observe special safety measures.

  • The oxygen gauge is equipped by sockets constantly connected to it (electric and type «a piggy tail») which should not be disconnected from it. Damage or removal of any of them is fraught with adverse influences on gauge functioning.
  • It is necessary not to suppose hit in an electric socket on the site of the valve of greasing equipped with jalousie and other pollution.
  • Do not apply to cleaning of the oxygen gauge some any solvents.
  • Address with the gauge cautiously - do not strike and do not stir up it.
  • The silicon protective cover should be established in the correct image in avoidance оплавления and for the purpose of maintenance of normal functioning of the gauge.

Check

 PERFORMANCE ORDER

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

The additional information on colouring of wires of the oxygen gauge can be gathered from electric schemes in the end of the Head System of an onboard electric equipment.

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

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

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

Replacement

As the oxygen gauge is established in a final collector or a reception pipe of system of release of the fulfilled gases which at cooling are compressed, turn out it at the cold engine it can to appear rather difficult. In order to avoid risk of damage of the gauge at removal (if only be not going to replace it in any case) preliminary start the engine on pair minutes. Be careful - do not burn in the course of procedure performance about разогретые surfaces of components of system of release of the fulfilled gases.


 PERFORMANCE ORDER

  1. Disconnect a negative wire from the battery.
  2. Поддомкратьте the car also establish it on props.
  3. Cautiously disunite an electric socket of the gauge.
  4. Accurately turn out the gauge from a final collector.
  5. For simplification of the subsequent removal of the gauge before installation grease its carving part with antitaking hermetic. The carving of the new gauge is usually already greased by such hermetic, however in case of installation to the place of the old gauge it is necessary to cover it anew.
  6. Establish the gauge and strongly tighten it.
  7. Connect an 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 gauge of absolute pressure in the pipeline (МАР)

The general description

Gauge MAR traces changes of pressure in the inlet pipeline, resulting changes of loadings on the engine and speeds of movement of the car and will transform the removed information to target stress. РСМ uses the signals received from gauge MAR for management by giving of fuel and updating of a corner of an advancing of ignition. РСМ receives the information in the form of peak (on pressure) a signal which level can vary in limits from 1.0 to 1.5 In at closed throttle заслонке (deep depression) and from 4.0 to 4.5 In at opened (weak depression). Gauge MAR is located in the box-shaped casing fixed on a partition of an impellent compartment.

Gauge MAR refusal 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 up the vacuum hose going from the case of a throttle to gauge MAR on presence of cracks and signs of ageing of a material. In case of need make replacement. The vacuum hose of gauge MAR is connected to the inlet pipeline. Gauge MAR on engines in volume of 5.2 l receives air of the pipeline from the union in a casing of the case of a throttle is connected to pipeline air through the union on the throttle case).
  2. Make sure of reliability of fastening of an electric socket of the gauge. Also check up socket plugs on presence of traces of corrosion and reliability of fastening to them of wires. Examine conducting. In case of need make necessary repair.
  3. Disunite an electric socket of gauge MAR, turn the ignition key in position ON (the engine do not start) and check up pressure on a basic wire (between violet-white (+) and weight). It should equal approximately 5 Century
  1. By means of the voltmeter check up basic pressure on a violet-white wire (+) - it should equal approximately 5 Century
  1. Connect a socket to the gauge and measure pressure on an alarm wire (red-white) at the included ignition (a key in position 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 gauge on РСМ.
  1. Without depression (the engine is switched off) check up pressure on a red-white wire of gauge MAR. It should equal approximately (4.0 - 5.0) Century
  1. On l models 5.2 start the engine and, having left its working on single turns, test a red-white alarm wire of the gauge positive probeом the voltmeter. Pressure should fall approximately to value in (1.5 - 2.5) In in process of deepening разряжения. If instrument readings do not correspond to this value, replace gauge MAR.

On engines of 4.0 l for depression creation on gauge MAR take advantage of the manual vacuum pump.


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

Replacement

 PERFORMANCE ORDER

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

The gauge of position of a cranked shaft

The general description

On cars of the given models the gauge of position of a cranked shaft serves for definition of distribution of injection of fuel in cylinders and its ignition in combustion chambers. The given work also carries out РСМ. The gauge represents the device working on effect of the Hall, established on a dome of transmission and carrying out calculation рисок on a flywheel (РКПП) or a flexible disk (АТ). If РСМ will cease to receive the information from the gauge of position of a cranked shaft, the engine will stop to function.

Components of the gauge of position of a cranked shaft - the engine of 4.0 l.

Components of the gauge of position of a cranked shaft - the engine of 5.2 l.

Check

 PERFORMANCE ORDER

  1. Connect an ohmmeter between plugs In and From an electric socket of the gauge of position of a cranked shaft. Infinite resistance should be fixed.
  1. Connected between plugs In and From a socket of the gauge of position of a cranked shaft the ohmmeter should show infinity.
  1. If the ohmmeter shows low resistance, replace the gauge.

Replacement

Рядный the six-cylinder engine

 PERFORMANCE ORDER

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

Engines V8

 PERFORMANCE ORDER

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

The gauge of temperature of a cooler (CTS)

The general description

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

Check

 PERFORMANCE ORDER

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

Measurement of resistance CTS on l model 4.0.

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

Replacement

Before starting performance проц2едуры wait full cooling of the engine.


 PERFORMANCE ORDER

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

Address with CTS with care. Gauge damage is capable to affect functioning of all system of injection of fuel.


Site CTS on engines of 4.0 l.


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

The gauge of position throttle заслонки (TPS)

The general description

The gauge of position throttle заслонки (TPS) is located at an end face of an axis throttle заслонки on the throttle case. By tracing of a target signal of gauge RSM defines fuel giving on a position corner заслонки (copes the driver). Exit TPS is out of operation fraught with infringement of stability of injection of fuel by injectors and idling turns as РСМ will believe that заслонка moves.

Check

 PERFORMANCE ORDER

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

  1. Then manually open заслонку against the stop and consider the voltmeter indication - now it should make nearby 3.5 - 5.0 Century
  1. Occurrence of any sort of problems in contour TPS leads to record in memory of the module of management of a code of malfunction 24. Immediately after input of code РСМ starts to use an artificial signal of position throttle заслонки that allows to restore partly operational parametres of the engine, again having raised an overall performance of the last.

Replacement

 PERFORMANCE ORDER

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

The gauge of temperature of air

The general information

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

Check

 PERFORMANCE ORDER

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

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

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

Check of basic pressure of the gauge of temperature of air on the engine of 5.2 l.

  1. If results of check appear negative, replace the gauge.
  2. If check has not revealed malfunctions of the gauge, and the problem on the former takes place, drive away the car in dealer branch or a workshop of car-care centre for carrying out of problem diagnostics РСМ.

Replacement

 PERFORMANCE ORDER

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

The gauge of speed of the car (VSS)

The general description

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

Check

 PERFORMANCE ORDER

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

Replacement

 PERFORMANCE ORDER

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

Отдавание a bolt of fastening VSS.

  1. Installation make upside-down.

Electromagnet of management of blocking

The general description

The electromagnet of management of blocking represents the actuation mechanism operated the processor applied to inclusion of the mechanism of blocking of the converter of rotation on equipped АТ cars. More in detail about check and replacement procedures Automatic transmission see in the Head.

The gauge of position of a camshaft

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

The gauge-switch of the permission of start

The description of procedures of check and gauge-switch replacement see in the Head the Manual box of a gear change.