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
+ 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
+ Gear shifting box
+ Transmission line
- Brake system
System of anti-blocking of brakes (ABS) - the general information and codes of malfunctions
Replacement of brake shoes
Removal and installation of supports of disk brake mechanisms
Check of a state, removal and installation of a brake disk
Removal and installation of the main brake cylinder (MBC)
Check of a state and replacement of brake lines and hoses
Sensitive to loading / перепускной valve (LSP & BP)
Adjustment of the parking brake
Replacement of cables of the drive of the parking brake
Check of serviceability of functioning / tightness, removal and installation of the amplifier of brakes
Pumping of the brake system
Adjustment of a pedal of a foot brake
Check of serviceability of functioning and replacement of the sensor switch of stoplights
Sensors and activator of the ABS system
+ Suspension bracket and steering
+ Onboard electric equipment
System of anti-blocking of brakes (ABS) – the general information and codes of malfunctions
Typical scheme of an arrangement of the ABS components
Sharp squeezing of a pedal of a foot brake on the car equipped with the brake system of usual type leads to blocking of wheels. At the same time coupling of a protector with a paving is broken, and the car can start to skid, losing controllability. The system of anti-blocking of brakes (ABS) (address an illustration above) prevents premature blocking of wheels, continuously operating the speed of their rotation during braking due to modulations of pressure of hydraulic liquid in each of brake mechanisms.
Electronic control unit (ECU) of ABS
ECU of the ABS system is fixed under a forward overlay of a threshold of the right door.
ECU traces the speed of rotation of each of car wheels, being guided by the arriving signals from wheel sensors. When at emergency braking any of wheels it begins to be blocked prematurely, ECU issues the command for activation of the hydraulic modulator of the electromagnetic valve placed inside which, working, opens the respective site of a brake contour, releasing from it a part of working liquid in the tank and, respectively, reducing working pressure. As soon as speeds of rotation of wheels are equalized, the valve is closed again and pressure continues to rise. The cycle lasts fractions of a second on each of wheels and repeats until braking is not complete. The design of system allows to correct pressure in hydraulic contours of each of four wheels. Actually the scheme of functioning of ABS is much more difficult, than it can seem therefore authors of the present manual do not recommend to owners of cars to make attempts of independent performance of repair of system. In case of malfunctions it will be most reasonable to address specialists of car service.
The modulator is installed in a motive compartment and equipped with the electromagnetic valve of adjustment of hydraulic pressure working at the command of ECU in contours of the brake system.
Each of wheels is equipped with the individual RPM meter. The sensor consists of a rotor (a ring with the teeth which are evenly located on its perimeter) and a sensitive element in the form of the podmagnichenny coil. The sensitive element of the sensor fixes the moments of passing of rotor teeths by it and will transform the obtained information to electric signals, control of ABS which are continuously transferred on the module. By results of processing of the arriving signals of ECU obtains information on the relative speed of rotation of each of wheels. While all four wheels rotate with an identical frequency, ABS stays in a passive state. As soon as any of wheels begins to be blocked, the control unit fixes change of the entering signal and develops the command for operation of the modulator which is instantly dumping pressure of hydraulic liquid in the brake mechanism of the corresponding wheel.
Sensor switch of stoplights
Determines the moment when the driver squeezes out a pedal of a foot brake by the signals arriving from the sensor switch of stoplights of ECU, at once activating ABS.
Diagnostics and recovery repair
If the control lamp of ABS which is built in in the car dashboard lights up and continues to burn during the movement, first of all make sure that the parking brake is completely released, and the brake system functions regularly. If all normal, therefore, there was ABS refusal. At the same time in memory of ECU the malfunction code has to be brought. At diagnostics and reading of codes of malfunctions the warning bulb on the dashboard will blink. In the presence of several codes, their indication will be begun with smaller number on increasing, regardless of time of their receipt. At the movement of the car codes of malfunction are not displayed. Perform visual inspection:
Recovery repair of ABS goes beyond qualification of the average amateur mechanic.
Reading and deleting of codes of malfunctions