The 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 at work АBS.
Gauges of frequency of rotation
Are located about each wheel. They develop impulses when about them take place teeths of rotors, and transfer to their electronic control device ABS on the basis of what frequency of rotation of wheels is calculated.
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Fig. 11.3. The forward gauge of frequency of rotation: 1 – a rotor of the gauge of frequency of rotation of a forward wheel; 2 – the plug; 3 – the gauge of frequency of rotation of a forward wheel
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Forward gauges of frequency of rotation are established on rotary fists in immediate proximity from a rotor which is an integral part of an external SHRUS of a shaft of a drive of a wheel (
fig. 11.3).
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Fig. 11.4. The back gauge of frequency of rotation on all models till 2001 and on all-wheel drive models since 2001: 1 – the gauge of frequency of rotation of a back wheel; 2 – a rotor of the gauge of frequency of rotation of a back wheel
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Fig. 11.5. The back gauge of frequency of rotation on models with one leading bridge of release since 2001: 1 – an electric socket; 2 – the gauge of frequency of rotation of a back wheel; 3 – a nave; 4 – a brake drum
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On all models till 2001 and on all-wheel drive models since 2001 back gauges 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).
The delay gauge
It was established on all-wheel drive models till 2001 and all models since 2001. The gauge is established under the central console and transmits signals about negative accelerations to electronic control device ABS.
On models till 2001 it is located under the panel of devices from outside the forward passenger, and on models since 2001 it is united with the modulator block. Function ECU — to accept and process the information received from gauges of frequency of rotation of wheels, and to operate pressure in the pipeline so that to exclude blocking of wheels. The electronic block of management carries out also diagnostic function, fire of a control lamp warning the driver about failure detection in electric chains or elements АBS. The malfunction code is brought in memory ECU and can be read without use of special devices.
Before a call of codes of malfunctions execute some simple checks:
– Check up level of a brake liquid in a compensatory tank;
– Check up reliability connection of all electric sockets АBS;
– Check up integrity of safety locks.
The electronic block of management stores a malfunction code while its memory will not be cleared, or malfunction will not be eliminated.
Control lamp АBS should light up after inclusion of ignition and go out at once after engine start-up. If the lamp continues to burn, the self-diagnostics system has registered malfunction in electric chains or elements of antiblocking system.
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Fig. 11.6. An arrangement of a crosspiece (1) in a diagnostic socket on models till 2001
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Fig. 11.7. An arrangement of contacts Tc and E1 a diagnostic socket on models till 2001
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Fig. 11.8. An arrangement of a diagnostic socket and contacts E1 and CG on models since 2001
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To read diagnostic codes of malfunction it is possible as follows. Turn the ignition key in position OFF (ignition is switched off). On models till 2001 remove a crosspiece 1 (
fig. 11.6), then an additional wire connect contacts Tc and E1 the diagnostic socket located about a compensatory tank of the amplifier of a steering (
fig. 11.7). On models since 2001 connect contacts E1 and CG the diagnostic socket located on the left side under the panel of devices (
fig. 11.8). Include ignition, without getting the engine, and by quantity of flashes of control lamp АBS define a malfunction code.
Number of a diagnostic code is defined by quantity of flashes of control lamp АBS. In the presence of malfunction of flash of control lamp АBS occur in two series the interval between which makes 1,5 with. For example, a code 34 (malfunction in a chain of the gauge 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 some codes of malfunctions before indication of each subsequent code the pause makes 2,5 with are brought. In the absence of malfunctions the control lamp flashes everyone 0,5 with.
Diagnostic codes, the reasons and methods of elimination of malfunctions are resulted in
tab. 11.3.
After perusal of codes and elimination of malfunctions clear memory
ECU. On models till 2001 separate contacts E1 and Tc a diagnostic socket, and on models since 2001 separate contacts E1 and CG. Include ignition, without getting the engine, and clear memory
ECU, having pressed a pedal of a brake of 8 or more times during 3 with. On models till 2001 establish into place a crosspiece 1 (
fig. 11.6). Close a cover of a diagnostic socket.
Check of an electric food and connection with "weight"
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Fig. 11.9. Electric sockets (And and) the dual relay
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All checks of an electric food and connection with "weight" make with tester use, connecting it to contacts of preliminary disconnected electric socket of the dual relay (
fig. 11.9).
Tests of check of an electric food and connection with "weight" are resulted in
tab. 11.4.
Check of gauges of frequency of rotation of wheels
Check of gauges of frequency of rotation of wheels make at disconnected from the block of management electric sockets. The procedure for test is resulted in
tab. 11.5.