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
   The general information
   Procedure of dump of pressure of fuel
   Check of pressure of fuel and functioning of the fuel pump
   Removal and installation of a fuel tank
   Cleaning and repair of a fuel tank - the general information
   Repair and replacement of fuel lines
   Removal and installation of the fuel pump
   Check of serviceability and replacement of the block of the gauge of level of fuel
   Removal and installation of assemblage of an air cleaner
   Replacement of a cable of gas
   System of injection of fuel - the general information
   Check of serviceability of system of injection of fuel
   Serviceability check, removal and installation of the case of a throttle
   Check of serviceability and replacement of a regulator of pressure of fuel
   Serviceability check, removal and installation of injectors of fuel
   Check of functioning and replacement of components of system of stabilisation of turns of idling (IAC)
   Service of system of release of the fulfilled gases - the general information
+ System of an electric equipment of the engine
+ Systems of decrease in toxicity of the fulfilled gases and engine management
+ 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


Check of functioning and replacement of components of system of stabilisation of turns of idling (IAC)

Management of idling turns is made by means of the valve of additional air (IAC). The valve provides change of volume of air submitted to the inlet pipeline around. Valve work the module of management РСМ taking into account changes of current operating conditions of the engine (inclusion-deenergizing of the conditioner of air and system of hydrostrengthening of a wheel, temperature of the engine and other conditions) operates.


Firm Chrysler recommends to use the special diagnostic device included consistently between motor IAC and an electric socket of a plait of wires for system check. There are some ways of check of functioning of system IAC forces of the mechanic-fan, however they are rather limited and yield certain result only in case of revealing of stable refusals.


    Disunite an electric socket of valve IAC and attentively listen to changes of turns of idling of the engine. Again connect a socket, include the conditioner of air and again listen to changes of turns. At the cold engine motor IAC to change idling turns, forcing them to fluctuate in process of engine warming up, the same concerns also a case of inclusion of the conditioner of air. In the absence of obvious signs of functioning of motor IAC continue check. By means of the voltmeter check up pressure on motor IAC - measure pressure on a feeding half of socket of the motor. At the working engine pressure should be present. At change of turns of the engine from top to down (or on the contrary) pressure should fluctuate between values in 2.0 and 6.0 V.Rezultaty of the given check is difficult enough to interpret in view of their dependence on changes of operating conditions of the engine.
    Measure pressure on a brown-white wire (plug) and a yellow-red wire socket (plug) at the included ignition (a key in position ON, the engine does not work) (the engine in volume 5.2 is shown).
    If pressure is absent, make diagnostics of malfunctions of electric contour IAC in a workshop of dealer branch or a car repair shop. If the processor provides pressure giving on motor IAC, make sure that the motor not заедает or has not failed. Remove the motor and, having left its connected, turn the ignition key in position ON (without starting the engine). If плунжер it is involved, start the engine and make sure in выдвигании плунжера for the purpose of indemnification of increase of turns of idling. It is required to stop up a niche in the throttle case under motor IAC installation.

If the pin is put forward, the engine should be disconnected before it leaves more than on 6,3 mm. Not performance of the given requirement is fraught with failure of motor IAC and necessity of its replacement. In a kind of last remark it will be reasonable to take advantage at performance of the given check by the help of the assistant into which problem will enter поворачивание at the command of the ignition key.

    Take regulator IAC from the throttle case, without disuniting its electric socket. Make sure that плунжер moves at first at ignition inclusion (a key in position ON), and then at engine start.



    Disunite an electric socket of valve IAC. Give fixing screws and remove valve IAC from the inlet pipeline.
    Give screws of fastening of valve IAC (the engine in volume 5.2).
    Screws of fastening of valve IAC (the engine in volume 4.0).
    Installation make upside-down. Do not forget to replace a sealing ring.