Toyota PAB4-Toyota RAV4
1. Operation of the car
2. Maintenance
3. Engines
4. Cooling systems and conditioning
5. Fuel system and system of production of the fulfilled gases
6. System of ignition
7. The control system and decrease in toxicity of the fulfilled gases
8. Coupling
9. Transmission
10. Driveshaft and shaft of the drive of driving wheels
11. Brake system
   General information
   Specifications
   Anti-blocking system of brakes (ABS)
      Elements of anti-blocking system of brakes
      Removal and installation of elements of anti-blocking system of brakes
   Replacement of front brake shoes
   Replacement of a support of a forward brake
   Check and replacement of brake disks
   Replacement of back brake shoes
   Replacement of the working brake cylinder
   Replacement of the main brake cylinder
   Replacement of sealing rings of a tank of the brake system
   Replacement of brake tubes and hoses
   Pumping of the hydraulic drive of brakes
   Check and replacement of the vacuum amplifier of brakes
   Adjustment of the parking brake
   Replacement of cables of the parking brake
   Adjustment of provision of a pedal of a brake
   Check and replacement of the switch of a stoplight
12. Suspension bracket
13. Steering and running gear
14. Body
15. Electric equipment
Schemes of electric equipment


Toyota RAV4>> Brake system>> Anti-blocking system of brakes (ABS)>> Elements of anti-blocking system of brakes
Modulator
Consists of the electric pump and four electromagnetic valves. The electric pump creates pressure and fills tanks in the modulator. The pump and tanks are placed in the modulator block. Electromagnetic valves modulate pressure in wheel brake cylinders during the work of ABS.
Rotation frequency sensors
Are located about each wheel. They develop impulses when about them there pass teeths of rotors, and transfer them to the electronic control ABS device on the basis of what the frequency of rotation of wheels is calculated.

Fig. 11.3. Forward sensor of frequency of rotation: 1 – rotor of the sensor of frequency of rotation of a forward wheel; 2 – plug; 3 – sensor of frequency of rotation of a forward wheel


Forward sensors of frequency of rotation are installed on rotary fists in close proximity to a rotor which is an integral part of the external CV JOINT of a shaft of the drive of a wheel (fig. 11.3) .

Fig. 11.4. The back sensor of frequency of rotation on all models till 2001 and on all-wheel drive models since 2001: 1 – sensor of frequency of rotation of a back wheel; 2 – rotor of the sensor of frequency of rotation of a back wheel


Fig. 11.5. The back sensor of frequency of rotation on models with one leading bridge of release since 2001: 1 – electric socket; 2 – sensor of frequency of rotation of a back wheel; 3 – nave; 4 – brake drum


On all models till 2001 and on all-wheel drive models since 2001 back sensors of frequency of rotation fasten bolts to levers of a back suspension bracket (fig. 11.4) . On models with one leading bridge since 2001 to the central part of a back nave (fig. 11.5) .
Delay sensor
Was established on all-wheel drive models till 2001 and all models since 2001. The sensor is installed under the central console and transmits signals of negative accelerations to the electronic control ABS device.

On models till 2001 it is located under the dashboard from the forward passenger, and on models since 2001 it is combined with the modulator block. The EBU function — to accept and process information obtained from sensors of frequency of rotation of wheels and to operate pressure in the pipeline so that to exclude blocking of wheels. The electronic control unit performs also diagnostic function, fire of a control lamp warning the driver about failure detection in electric chains or the ABS elements. The code of malfunction is brought in memory of EBU and can be read without use of special devices.
Before a call of codes of malfunctions execute several simple checks:
– check the level of brake fluid in a compensation tank;
– check reliability connection of all electric ABS sockets;
– check integrity of safety locks.
The electronic control unit stores a malfunction code until his memory is cleared, or malfunction will not be eliminated.
The control lamp of ABS has to light up after inclusion of ignition and go out at once after launch of the engine. If the lamp continues to burn, the system of self-diagnostics registered malfunction in electric chains or elements of anti-blocking system.

Fig. 11.6. An arrangement of a crossing point (1) in the diagnostic socket on models till 2001


Fig. 11.7. An arrangement of contacts of Tc and E1 of the diagnostic socket on models till 2001


Fig. 11.8. An arrangement of the diagnostic socket and contacts of E1 and CG on models since 2001


It is possible to read diagnostic codes of malfunction as follows. Turn the ignition key in position of OFF (ignition is switched off). On models till 2001 remove a crossing point 1 (fig. 11.6) , then an additional wire connect contacts of Tc and E1 of the diagnostic socket located about a compensation tank of the amplifier of steering (fig. 11.7) . On models since 2001 connect contacts of E1 and CG of the diagnostic socket located on the left side under the dashboard (fig. 11.8) . Include ignition, without starting the engine, and determine a malfunction code by the number of flashes of a control lamp of ABS.
Number of a diagnostic code is determined by the number of flashes of a control lamp of ABS. With malfunction of flash of a control lamp of ABS occur in two series, the interval between which makes 1,5 pages. For example, a code 34 (malfunction in a chain of the sensor of frequency of rotation of a back left wheel): the lamp flashes 3 times, a pause 1,5 with, then the lamp flashes 4 more times. If in memory several codes of malfunctions are brought, then before indication of each subsequent code the pause makes 2,5 pages. In the absence of malfunctions the control lamp flashes each 0,5 pages.
Diagnostic codes, the reasons and methods of elimination of malfunctions are given in tab. 11.3 .
After reading of codes and elimination of malfunctions clear memory of EBU. On models till 2001 separate contacts of E1 and Tc of the diagnostic socket, and on models since 2001 separate contacts of E1 and CG. Include ignition, without starting the engine, and clear memory of EBU, having pressed a pedal of a brake of 8 or more times during 3 pages. On models till 2001 establish into place a crossing point 1 (fig. 11.6) . Close a cover of the diagnostic socket.
Check of electric food and connection with "weight"

Fig. 11.9. Electric sockets (And yes In) the dual relay


You make all checks of electric food and connection with "weight" with use of a tester, connecting it to contacts of previously disconnected electric socket of the dual relay (fig. 11.9) .
Tests of check of electric food and connection with "weight" are provided in tab. 11.4 .
Check of sensors of frequency of rotation of wheels
You make check of sensors of frequency of rotation of wheels at the electric sockets disconnected from the control unit. The procedure for test is given in tab. 11.5.