Toyota Land Cruiser 100/Amazon, Lexus LX 470

since 1997 release

Repair and operation of the car

Toyota Land Cruiser, Amazon, Lexus LX470
+ Identification numbers of the car
+ Governing bodies and methods of safe operation of the car
+ Settings and routine maintenance of the car
+ Engine
+ Cooling systems of the engine, heating of salon and air conditioning
+ A power supply system and production of the fulfilled gases
+ Engine electric equipment
- Control systems of the engine and decrease in toxicity of the fulfilled gases
   System of onboard diagnostics (OBD) - the principle of functioning and codes of malfunctions
   Application of an oscillograph for observation of working signals of a control system
   Check of a state and replacement of ESM
   Information sensors - the general information and check of serviceability of functioning
   Replacement of information sensors
   System of catching of fuel evaporations (EVAP) - the general information, check of a state and replacement of components
   System of the operated ventilation of a case (PCV)
   The catalytic converter - the general information, check of a state and replacement
+ Gear shifting box
+ Transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


System of the operated ventilation of a case (PCV)

General information

The scheme of the movement of a stream of crankcase gases in the engines equipped with the PCV system of a typical design

The PCV system (address an illustration above) serves for decrease in issue in the atmosphere of hydrocarbonic connections at the expense of a conclusion from the engine of crankcase gases. The purge of the block is carried out by a pro-race of the fresh air arriving from the air cleaner through a case in which it mixes up with the collected evaporations and the gases which broke from combustion chambers and is removed via the PCV valve in the inlet pipeline.

The PCV valve, air inlet and set of the vacuum hoses connecting the listed devices to the engine are among the main components of system.

For the purpose of maintenance of stability of turns of idling the PCV valve blocks a purge stream at deep depression in the inlet pipeline. In case of violation of serviceability of functioning of the engine (as, for example, at wear of piston rings) the system makes withdrawal of excess of crankcase gases through a ventilating tube back in the air cleaner and their reburning in combustion chambers.

Intake of crankcase gases in the engine is carried out via cases of a throttle which begins to become covered by tarry deposits, in particular around an arrangement of a butterfly valve over time. In view of told, it is necessary to make cleaning of the case of a throttle from time to time.



1. For check of serviceability of functioning of the PCV valve it should be released from the rubber landing plug and to shake. The serviceable valve when stirring has to publish the noise proceeding from a locking needle, – in case of need make replacement of valvate assembly.
2. Start the engine on single turns and press a finger to an opening in the valve, – in assembly depression has to take place. If depression is not felt, at first check passability of a vacuum hose, then (if a hose as it should be) replace the valve.



1. Having pulled vertically up, take the valve from the rubber landing plug. Estimate a plug condition, in case of need make replacement.
2. If the valve is hammered with tarry deposits, also the probability of violation of passability of a connecting hose is not excluded, – remove a hose and wash out it solvent.
3. Having washed out a hose, check it for existence of signs of aging of material and mechanical damages. Track reliability of fixing of a hose on reception unions.
4. In case of need make replacement of the PCV valve.