Jeep Grand Cherokee

1993-1999 of release

Repair and operation of the car



Jeep Grand Cherokee
+ Cars of the Jeep Grand Cherokee brand
+ Settings and routine maintenance
+ Line six-cylinder engine
+ V8 engine
+ Procedures of the general and capital repairs of the engine
+ Cooling systems, heating and air conditioning
- Power supply system and production of the fulfilled gases
   General information
   Procedure of dumping of pressure of fuel
   Check of pressure of fuel and functioning of the fuel pump
   Removal and installation of the fuel tank
   Cleaning and repair of the 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 fuel level sensor
   Removal and installation of assembly of the 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 the regulator of pressure of fuel
   Serviceability check, removal and installation of injectors of fuel
   Check of functioning and replacement of components of system of stabilization of turns of idling (IAC)
   Service of system of production of the fulfilled gases - the general information
+ System of electric equipment of the engine
+ Systems of decrease in toxicity of the fulfilled gases and engine management
+ 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 methods of operation



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

Management of turns of idling is made by means of the valve of additional air (IAC). The valve provides change of volume of the air given to the inlet pipeline around. Operation of the valve the module of management of RSM taking into account changes of the current operating conditions of the engine (turning on switching off of the conditioner of air and system of hydrostrengthening of a wheel, temperature of the engine and other conditions) operates.

Check

Chrysler recommends to use the special diagnostic unit which is switched on consistently between the IAC motor and the electric socket of a plait of wires for check of system. There are several ways of check of functioning of the IAC system by the amateur mechanic's forces, however they are very limited and yield a certain result only in case of identification of stable refusals.

 PERFORMANCE ORDER

  1. Disunite the electric socket of the IAC valve and attentively listen to changes of turns of idling of the engine. Again connect the socket, turn on the conditioner of air and again listen to changes of turns. At the cold engine the IAC motor to change idling turns, forcing them to fluctuate in process of warming up of the engine, the same concerns also a case of turning on of the conditioner of air. In the absence of obvious signs of functioning of the IAC motor continue check.
  2. By means of the voltmeter check tension on the IAC motor - measure tension on the feeding half of the socket of the motor. Tension has to be present at the working engine. At change of turns of the engine from top to down (or on the contrary) tension has to fluctuate between values in 2.0 and 6.0 Century. Results of this check it is rather difficult to interpret in view of dependence them from changes of operating conditions of the engine.
  1. Measure tension on a brown-white wire (plug B) and a yellow-red wire (plug A) of the socket at the included ignition (a key in position of ON, the engine does not work) (the 5.2 l engine is shown).
  1. If tension is absent, make diagnostics of malfunctions of an electric contour of IAC in a workshop of dealer office or car repair shop.
  2. If the processor provides giving of tension on the IAC motor, make sure that the motor does not jam or did not fail. Remove the motor and, having left it connected, turn the ignition key in position of ON (without starting the engine). If the plunger is involved, start the engine and make sure of a plunger vydviganiye for the purpose of compensation of increase in turns of idling. It will be required to stop up a niche in the throttle case under installation of the IAC motor.

If the pin moves forward, the engine has to be switched-off before it comes more than to 6,3 mm. Not implementation of this requirement is fraught with failure of the IAC motor and need of its replacement. In a type of the last remark it will be reasonable to use when performing by the help of the assistant given checks which problem will include turning at the command of the ignition key.


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

Replacement

 PERFORMANCE ORDER

  1. Disunite the electric socket of the IAC valve.
  2. Give fixing screws and remove the IAC valve from the inlet pipeline.
  1. Give screws of fastening of the IAC valve (the 5.2 l engine).
  1. Screws of fastening of the IAC valve (4.0 l engine).
  1. You make installation upside-down. Do not forget to replace a sealing ring.