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


The description of a principle of action of system of self-diagnostics and procedure of reading of codes of malfunctions

Before starting a conclusion of codes of malfunctions carefully check up a condition of all electric sockets and hoses. Make sure of reliability of fastening of sockets, absence of traces of corrosion and pollution; hoses also should be in a satisfactory condition (without cracks and cuts) and to be reliably fixed on the unions.

On models to which the given Management is devoted, control CHECK ENGINE (Check up the engine) or MIL (Indication of refusals) is located on an instrument guard and at engine start flashes for three seconds as check of serviceability of a lamp. In case of occurrence of problems in system MPFI the lamp lights up and remains included.

Access to the information stored in memory РСМ on the fixed refusals of system is possible with the help or the ignition key, or the special input reader of diagnostic codes DRB II. The given device is connected to the socket of diagnostics located in an impellent compartment. Thus codes and parametres of malfunctions are displayed the input reader display. However scanner DRB II is expensive enough device and the majority of mechanics-fans prefer to using to them an alternative method. A negative side of a method of reading of codes of malfunctions by means of the ignition key is absence of possibility выcandlesивания the full list of codes. The majority of problems dare usually or diagnosed easily enough and if to receive the certain information it is not possible, it is necessary to address for the help in a workshop of dealer branch or car-care centre at which order there is necessary more difficult equipment.


    For выcandlesивания codes of malfunctions by means of the ignition key first of all cock a lay brake and translate transmission in position Р. Lift frequency of rotation of the engine to 2500 rpm, then slowly dump turns to the single. For short time include (then switch off) air central air. Then, having squeezed out a foot brake, consistently spend the selector lever through all positions (Reverse, Drive, Low, etc.), having finished again on position Р (Park - the Parking). It will allow the module processor to fix codes of all refusals connected with gauges, reacting to changes in functioning of transmission, the engine (its turns) and air conditioner. For выcandlesивания codes of malfunctions lamp CHECK ENGINE or MIL, consistently turn the ignition key in positions ON, OFF, ON, OFF and again - ON (the engine is muffled). After that the lamp will start to highlight the codes fixed in memory РСМ. At first the lamp will highlight the first figure of a two-place code, then, after a pause - the second. For example: the code 23 (a contour of the gauge of temperature of air) will look as follows: two flashes, a pause, three flashes. For input of a code of malfunction in memory of the block of management of the engine certain conditions should be satisfied. It can be a preset value of turns of the engine, its temperatures or pressure (entrance) signal coming on the controller. There is a probability that at interrogation any of contours of system the code taking in it a refusal place will not be entered into memory. Such can result from absence of one of criteria of a code of the given malfunction (default of one of conditions). For example: for adequate interrogation (about revealing of malfunctions) a contour of gauge MAR the engine should function with frequency of rotation in limits (750 - 2000) rpm. If frequency of the engine exceeds 2400 rpm, the target signal of gauge MAR will appear is short-circuited on weight that will not allow to enter a refusal code into memory of the controller. Can take place and absolutely opposite situation: in memory it will appear the code of malfunction of absolutely other component of system is brought. For example: problems with pressure of fuel cannot be registered the processor directly, however, they lead to repauperization or reenrichment of an air-fuel mix that forces self-diagnostics system to bring in memory of the module a refusal code in a contour of the oxygen gauge. It is necessary to remember constantly mutual crossing of spheres of action of various gauges and contours, and also about influence against each other results of functioning of power supply systems and the control of toxicity of the fulfilled gases.

Brought more low to attention of readers the table represents the list of codes of possible malfunctions and refusals of functioning of system which can be highlighted during carrying out of its diagnostics. Besides, in the table are listed possible each of prospective refusals. If after the entering of all corrections made on the basis of results of given diagnostics a situation does not settle into shape, it is necessary to address for consultation in a workshop of dealer branch or car-care centre.

Codes of diagnostics of malfunctions

Not all from the resulted codes can take place on all models.

Code 11 At engine rotation the basic signal from the distributor does not arrive. Check up a contour between the distributor and РСМ.
Code 12 Problem with battery contacts. Direct giving of a food from the battery on the controller was absent during not less than 50 inclusions of ignition.
Code 13 ** Specifies in problems with pneumatic (vacuum) system of gauge MAR.
Code 14 ** Pressure of gauge MAR is not enough or too highly.
Code 15 ** Problems with signals VSS. Gauge signals are not defined at car movement.
Code 16 Loss of a food from the battery.
Code 17 The engine too long remains cold. The gauge of temperature of a cooler fixes temperature below the normal worker during engine functioning (check up the thermostat)
Code 21 ** Problems in a gauge contour About 2. There are no fluctuations of pressure of the gauge on the processor.
Code 22 ** It is not enough or too highly pressure of the gauge of a cooler. Check up the gauge.
Code 23 ** Speaks about too low (below admissible value) or too high (above admissible) level of an entrance signal of the gauge of temperature of air.
Code 24 ** It is not enough or too highly pressure TPS. Check up the gauge.
Code 25 ** Motor IAC contour. Short circuit in one or more contours of the motor Takes place.
Code 27 One of contours of management of injectors does not react properly to management signals. Check up contours.
Code 31 ** Problem in a contour an electromagnet of a purge of a coal adsorber.
Code 32 ** Breakage or short circuit in a contour of electromagnet EGR is fixed is possible during diagnostics the disbalance of structure of an air-fuel mix has not been revealed.
Code 33 Relay contour муфты couplings of the conditioner of air. Breakage or short circuit in a relay contour is defined.
Code 34 Breakage or short circuit in contours of electromagnets of the vacuum control of turns or ventilation is defined.
Code 37 Contour of an electromagnet of coupling of the converter of rotation. Breakage or short circuit in a contour of an electromagnet of disconnection of a part of a throttle of the converter of rotation (only АТ) takes place.
Code 41 ** Problems in charge system. Arise when pressure of the battery from relay ASD falls below 11.75 Century
Code 42 Breakage or short circuit of a contour of management of relay ASD is revealed.
Code 44 Wrong pressure of the gauge of temperature of the battery. Problems with a contour of pressure of temperature of the battery in РСМ.
Code 45 Electromagnet of transfer into raising transfer. Problems in an electromagnet contour are revealed.
Code 46 ** Pressure of system of a charge is too high. The processor informs on inadequate adjustment of pressure of the battery.
Code 47 ** Pressure of system of a charge is not enough. During engine functioning measured entrance pressure of the battery below set зарядного pressure and during active check of a target signal of the generator has not been revealed appreciable changes of pressure.
Code 51* The target signal of the gauge About 2 testifies to repauperization of a gas mixture during engine functioning.
Code 52 ** The target signal of the gauge About 2 testifies to reenrichment of a gas mixture during engine functioning.
Code 53 Internal malfunction of module RSM.
Code 54 There is no signal of the gauge of position of a camshaft from the distributor. Problems with a contour of synchronisation of the distributor.
Code 55 End of process of reading of codes of malfunction by control lamp CHECK ENGINE. A code of end of a mode of diagnostics.
Code 62 Unsuccessful attempt to correct the indication of run EMR in memory of a monitor.
Code 63 Monitor refusal. Record negation in memory. Check up РСМ.

** the Given codes are highlighted by lamp CHECK ENGINE on an instrument guard at work of the engine in the course of record of a code of malfunction.