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 serviceability of system of injection of fuel

The description of the underwritten procedure is made on the basis of the assumption that pressure of fuel is adequate (see the Section Check of Pressure of Fuel and Functioning of the Fuel Pump).


  1. Check quality and reliability of fastening of contacts of wires of grounding on the inlet pipeline. Check also contacts of all system of an electrical wiring concerning work. Weakening of fastening of plugs and violation of quality of grounding can lead to more serious refusals.
  2. Make sure that the battery is completely charged as functioning of the control unit and the sensors defining amount of the given fuel considerably depends on accuracy of giving of food on them.
  3. Check a condition of an element of the air filter - the filter hammered with dirt significantly reduces efficiency of functioning and profitability of the engine (The head Nastroyki and routine maintenance).
  4. If during check the burned-down safety lock is found, replace it and check whether it fails at once again. If yes, - try to reveal short circuit on weight in a plait of wires of the fuel pump.
  5. Check a sleeve of the air inlet going to the inlet pipeline for leaks. Leaks such lead to excessive impoverishment of mix. Also check a condition of all vacuum hoses of the inlet pipeline and their nipple connections.
  6. Disconnect an air inlet sleeve from the case of a throttle and check it for existence of signs of pollution, accumulation of soot and other deposits. In case of need clean a sleeve by means of a toothbrush and a cleaner for carburetors.
  7. At the working engine serially press a stethoscope to each of injectors and listen to the clicks published by it indicating serviceability of its functioning. Instead of a stethoscope it is possible to press a sting of the screw-driver to an injector and to listen to clicks via its handle. Frequency made by an injector click depends on engine turns.
  8. Disunite electric sockets of injectors and measure resistance of each of them. Compare results to data of Specifications.
  1. Measure resistance of each of injectors - it has to equal about 12 Century.
  1. Connect a control lamp of check of injectors to the socket of each of injectors serially. Turn the engine. The lamp has to flash evenly on each of sockets. It is check of supply voltage of injectors.
  1. Connect a control lamp of check of injectors to the electric socket of each of them and make sure that it blinks at an engine provorachivaniye.
  1. Further checks of system are given in the following Sections of the Head.