10.3. ABS system
The system of an automatic unblocking of brakes (ABS system), is intended for increase in stability of the car in the conditions of sharp braking or at the movement in bad road conditions. It is provided that pressure in a contour of brakes is regulated depending on the speed of rotation of wheels registered by sensors.
Arrangement of units of anti-blocking system of brakes (ABS system)
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1. Aktyuator
2, 10. Forward sensors of speed 3. Diagnostic socket (DLC1) 4. Control unit 5. Control lamp of serviceability of ABS system |
6, 11. Rotors of sensors of speed 7. Back sensors of speed 8. Diagnostic socket (DLC1) 9. Braking signal switch 12. ABS system electric motor relay 13. Traction relay of the solenoidal valve |
System ABS-units
AKTYUATOR
The main cylinder, the electrohydraulic pump and 4 solenoidal valves are a part of an aktyuator.
Prevention
The electric pump is intended for pumping of liquid in aktyuator receivers through which liquid under pressure moves in a contour of brakes.
Solenoidal valves operate pressure in a contour of brakes at operation of the ABS system, the block of valves contains 4 valves, it is the share of a wheel on 1 valve.
SENSORS OF SPEED OF ROTATION OF WHEELS
Sensors of rotor type, are mounted on each of wheels. Signals from sensors arrive on the control unit.
Forward sensors are mounted on a rotary fist, near gear rings of rotors. Rotors are structurally combined with forward external CV JOINTS of half shafts.
Back sensors are mounted on arms of a back axis, rotors are structurally combined with a back nave.
ABS SYSTEM CONTROL UNIT
The control unit of the Nippondenso system is mounted under a forward partition of a body, the control unit of the Bosch system is mounted in an aktyuator. On the block signals from the switch of a signal of braking and sensors of speed of each wheel arrive. These signals are basic data for adjustment of pressure in a hydraulic actuator of this wheel. The control unit also possesses function of self-diagnostics and storing of refusals.
At system failure the control lamp on the dashboard lights up, and in memory the code of refusal which can be considered and defined the nature of malfunction or faulty knot is brought.
Diagnostic codes
The code of malfunction is stored in memory before deleting of contents of cells of memory, or before malfunction elimination.
At inclusion of ignition the control lamp of the ABS system lights up, and after launch of the engine dies away. If the lamp continues to burn, then in the ABS system malfunction is registered.
For access to codes of refusals transfer the ignition key to position of OFF (the engine does not work). In the Nippondenso system get a crossing point (you watch the photo) conclusions of the diagnostic socket. On systems of both types you peremknit conclusions of E1 and the CU of the socket, transfer the ignition key to position of ON (the engine is not started) and consider codes.
Crossing point of the diagnostic socket of the Nippondenso ABS system
| 1. Crossing point |
Peremykayemy conclusions on two types of the used diagnostic sockets
Figures of a two-digit code are determined by number of the blinkings of a control lamp divided by a pause in 1,5 sec. (for example a code 34 – 3 flashes, a pause 1,5 sec. and 4 flashes).
The following code (with one more malfunction) appears in 2,5 sec. after the first. If the system is serviceable, then the lamp blinks with the period of 0,5 pages.
Determine the nature of refusal by the enclosed table.
After reading erase codes for what you peremknit conclusions of E1 and the CU of the socket, transfer the ignition key to position of ON (the engine is not started) and press a pedal not less than 8 times during 5 sec. Remove a crossing point and put into place a socket cover. Hand over the car in car service.
Table of codes of failures of the system of ABS
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CODE
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NATURE OF MALFUNCTION
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THE TAKEN ACTIONS
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11
| Break in a solenoid relay chain | To check the relay of the solenoidal valve and conducting of a chain of the relay |
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12
| Short circuit of a chain of the relay of the solenoidal valve | The same |
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13
| Break in a pump electric motor relay relay chain | To check the relay of the pump and conducting of a chain of the relay |
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14
| Short circuit of a chain of the relay of the electric motor of the pump | The same |
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21
| The chain of the solenoid of the right forward wheel is faulty | To check the solenoid of an aktyuator and a chain |
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22
| The chain of the solenoid of the left forward wheel is faulty | The same |
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23
| The chain of the solenoid of the right back wheel is faulty | The same |
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24
| The chain of the solenoid of the left back wheel is faulty | The same |
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25
| Break or short circuit in SMC1 chain | To check an aktyuator of system and a chain |
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26
| Break or short circuit in SMC2 chain | To check an aktyuator of system and a chain |
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27
| Break or short circuit in SRC1 chain | To check an aktyuator of system and a chain |
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28
| Break or short circuit in SRC2 chain | To check an aktyuator of system and a chain |
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31
| The sensor of speed of the right forward wheel is faulty | To check speed sensors, conducting and the socket of the sensor |
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31
| The signal from the sensor of speed of the right forward wheel does not arrive | To check the speed sensor, conducting and the socket of the sensor |
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32
| The signal from the sensor of speed of the left forward wheel does not arrive | The same |
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33
| The signal from the sensor of speed of the right back wheel does not arrive | The same |
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34
| The signal from the sensor of speed of the left back wheel does not arrive | The same |
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35
| Break in a chain of the sensor of speed of the right forward wheel | The same |
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36
| Break in a chain of the sensor of speed of the left forward wheel | The same |
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37
| The number of teeth of a rotor of the sensor of speed does not correspond to normal | To check serviceability of a rotor of the sensor (existence of all teeth) |
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38
| Break in a chain of the sensor of speed of the right back wheel or in the sensor. | To check the speed sensor, conducting and the socket of the sensor |
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39
| Break in a chain of the sensor of speed of the left back wheel or in the sensor | To check the speed sensor, conducting and the socket of the sensor |
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41
| Too low voltage on the battery | Check system of a charge: the generator (see subsection 3.4.10), the battery (see subsection 3.4.9), tension regulator (see subsection 3.4.11). |
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43
| Failure of the system of management of an unblocking of brakes | Check all wires and sockets of ABS system |
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44
| Break or short circuit in a NE signal chain | Check all wires and sockets from the ABS system control unit |
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49
| Break in a chain of the switch of a signal of braking or in the switch | Check the switch and a chain of the switch |
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51
| The aktyuator electric motor is blocked | Check existence of short circuit in a chain of the electric motor and relay, check the battery |
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53
| Refusal of a PCM chain | Check all wires and sockets from the ABS system control unit |
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58
| Break in a chain of the switch of a signal of braking or in the switch | Check the switch and a chain of the switch |
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61
| Failure of the system of engine management | Check codes of failures of the system of engine management (see subsection 7.2.) |
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62
| Failure of the control unit | Repair or replacement of the control unit is required |
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The lamp burns continuously
| Failure of the control unit | Repair or replacement of the control unit is required |