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

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 a condition of all electric sockets and hoses. Make sure of reliability of fastening of sockets, lack 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 this Management is devoted, control CHECK ENGINE (Check the engine) or MIL (Indication of refusals) is located on an instrument guard and at start of the engine flashes for three seconds as check of serviceability of a lamp. In case of problems in MPFI system the lamp lights up and remains included.

Access to RSM which was stored in memory of information on the fixed refusals of system is possible with the help or the ignition key, or the special input reader of the diagnostic DRB II codes. This device is connected to the socket of diagnostics located in an impellent compartment. Thus codes and parameters of malfunctions are displayed the input reader display. However the DRB II scanner is quite expensive device and the majority of amateur mechanics 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 lack of possibility of highlighting of the complete list of codes. The majority of problems decide usually or diagnosed rather easily and if to receive certain information it is not possible, it is necessary to address for the help in a workshop of dealer office or car-care center at the disposal of which there is a necessary more difficult equipment.


  1. For highlighting of codes of malfunctions by means of the ignition key first of all cock the parking brake and transfer transmission to the situation "R". 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 carry out the selector lever through all provisions (Reverse, Drive, Low, etc.), having finished again on the situation "R" (Park - the Parking). It will allow the processor of the module to fix codes of all refusals connected with sensors, reacting to changes in functioning of transmission, the engine (its turns) and the air conditioner.
  2. For highlighting of codes of malfunctions CHECK ENGINE or MIL lamp, consistently turn the ignition key in the provisions ON, OFF, ON, OFF and again - ON (the engine is muffled). After that the lamp will start to highlight RSM fixed in memory codes. 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 sensor of air temperature) will look as follows: two flashes, pause, three flashes.
  3. For input of a code of malfunction in memory of the control unit of the engine should be satisfied certain conditions. It can be a preset value of turns of the engine, its temperatures or tension (entrance) signal coming to the controler. There is a probability that at poll any of system contours the code taking in it a place of refusal will not be entered into memory. Such can result from lack of one of criteria of a code of this malfunction (default of one of conditions). For example: for adequate poll (about detection of malfunctions) a MAR sensor contour the engine should function with frequency of rotation within (750-2000) rpm. If frequency of the engine exceeds 2400 rpm, the target signal of the MAR sensor will appear is short-circuited on weight that will not allow to enter a refusal code into memory of the controler. Can take place and absolutely opposite situation: in memory it will appear the malfunction code absolutely other component of system is brought. For example: problems with pressure of fuel cannot be registered by the processor directly, however, they lead to repauperization or reenrichment of an air and fuel mix that forces system of self-diagnostics to bring in memory of the module a refusal code in a contour of the oxygen sensor. It is necessary to remember constantly mutual crossing of spheres of operation of various sensors and contours, and also about influence at each other results of functioning of power supply systems and control of toxicity of the fulfilled gases.

Offered below 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 its diagnostics. Besides, in the table are listed possible each of prospective refusals. If after the introduction of all corrections made on the basis of results of this diagnostics a situation does not settle into shape, it is necessary to address for consultation in a workshop of dealer office or car-care center.

Codes of diagnostics of malfunctions

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

Code 11 At rotation of the engine the basic signal from the distributor does not arrive. Check a contour between the distributor and RSM.
Code 12 Problem with battery contacts. Direct giving of a food from the battery on the controler was absent during not less than 50 inclusions of ignition.
Code 13 ** Points to problems with pneumatic (vacuum) system of the MAR sensor.
Code 14 ** Tension of the MAR sensor is not enough or too highly.
Code 15 ** Problems with VSS signals. Signals of the sensor are not defined at car movement.
Code 16 Food loss from the battery.
Code 17 The engine too long remains cold. The sensor of temperature of a cooler fixes temperature below the normal worker during engine functioning (check the thermostat)
Code 21 ** Problems in a sensor O 2 contour. There are no fluctuations of tension of the sensor on the processor.
Code 22 ** It is not enough or too highly tension of the sensor of a cooler. Check the sensor.
Code 23 ** Speaks about too low (below admissible value) or too high (above admissible) level of an entrance signal of the sensor of air temperature.
Code 24 ** It is not enough or too highly tension of TPS. Check the sensor.
Code 25 ** IAC motor 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 contours.
Code 31 ** Problem in a contour an electromagnet of a purge of a coal adsorber.
Code 32 ** Break or short circuit in a contour of an electromagnet of EGR is fixed it is possible during diagnostics the imbalance of structure of an air and fuel mix was not revealed.
Code 33 Contour of the relay of the coupling of coupling of the conditioner of air. Break or short circuit in a relay contour is defined.
Code 34 Break or short circuit in contours of electromagnets of vacuum control of turns or ventilation is defined.
Code 37 Contour of an electromagnet of coupling of the converter of rotation. Break or short circuit in a contour of an electromagnet of disconnection of a part of a throttle of the converter of rotation (only AT) takes place.
Code 41 ** Problems in charge system. Arise when tension of the battery from the ASD relay falls below 11.75 Century.
Code 42 Break or short circuit of a contour of management of the ASD relay is revealed.
Code 44 Wrong tension of the sensor of temperature of the battery. Problems with a contour of tension of temperature of the battery in RSM.
Code 45 Electromagnet of transfer to raising transfer. Problems in an electromagnet contour are revealed.
Code 46 ** Tension of system of a charge is too high. The processor informs on inadequate adjustment of tension of the battery.
Code 47 ** Tension of system of a charge is not enough. During engine functioning measured entrance tension of the battery is lower than the set charge voltage and during active check of a target signal of the generator was not revealed appreciable changes of tension.
Code 51* The target signal of the sensor O 2 testifies to repauperization of gas mixture during engine functioning.
Code 52 ** The target signal of the sensor O 2 testifies to reenrichment of gas mixture during engine functioning.
Code 53 Internal malfunction of the RSM module.
Code 54 There is no signal of the sensor of provision of a camshaft from the distributor. Problems with a contour of synchronization of the distributor.
Code 55 Completion of process of reading of codes of malfunction by a control lamp of CHECK ENGINE. Code of end of a mode of diagnostics.
Code 62 Unsuccessful attempt to correct the indication of run of EMR in memory of a monitor.
Code 63 Monitor refusal. Record denial in memory. Check RSM.

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