Subaru Forester
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
+ The engine
+ Systems of cooling, heating
+ The power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Gear change box
+ Coupling, трансмиссионная a line
- Brake system
Specifications
System of antiblocking of brakes (ABS) - the general information and diagnostic checks
Removal and installation of basic components ABS
Check and adjustment of height of position and free wheeling of a pedal of a foot brake
Adjustment of a rod of pusher gtts / of the VACUUM amplifier of brakes
Check and adjustment of a drive of a lay brake
Check of serviceability of functioning of the vacuum amplifier of brakes
Replacement brake колодок disk brake mechanisms
Removal and installation of supports of disk brake mechanisms
Condition check, removal and installation of a brake disk
Replacement of boots and service of drum-type brake mechanisms of back wheels
Removal and installation of components of assemblage of a lay brake (model with disk brake mechanisms of back wheels)
Removal and installation of the main brake cylinder
Check of a condition and replacement of brake lines and hoses
Removal and installation of assemblage of the vacuum amplifier of brakes
Prorolling of brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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System of antiblocking of brakes (ABS) - the general information and diagnostic checks
The general information
The scheme of an arrangement of basic components ABS
On equipped with brake system of usual type vehicles, sharp squeezing of a pedal of a foot brake leads to blocking of wheels. Coupling of a protector with a road covering is thus broken, and the car can go юзом, losing controllability. The system of antiblocking of brakes (ABS) prevents premature blocking of wheels, continuously operating speed of their rotation during braking at the expense of modulations of pressure of a hydraulic liquid in each of brake mechanisms. Number of basic components ABS concern: four wheel gauges, four rotors of wheel gauges, assemblage the management block (ECU) with the hydraulic modulator, gauge "G" (the gauge of overloads), the gauge-switch of stoplights and control lamp ABS.
The block of management and the hydraulic modulator
Built in in assemblage of the hydraulic modulator the block of management ABS traces speed of rotation of each of car wheels, being guided by arriving signals from wheel gauges. When at emergency braking any of wheels it starts to be blocked prematurely, the management module gives out a command on activation of the electromagnetic valve placed in the hydraulic modulator which, working, opens a corresponding site of a brake contour, letting out from it a part of a hydraulic liquid in the tank and, accordingly, reducing working pressure. As soon as speeds of rotation of wheels are equalised, the valve is closed again also pressure continues to rise. The cycle lasts fractions of a second on each of wheels and repeats until braking will not be finished. The system design allows to correct pressure in hydraulic contours of each of four wheels. Actually the scheme of functioning ABS is much more difficult, than it can seem, therefore composers of the present Management do not recommend to owners of cars to make attempt of independent performance of repair of system. In case of occurrence of malfunctions it will be most reasonable to address to experts of car-care centre.
Wheel gauges and their rotors
Each of wheels is equipped by the individual gauge of turns. The gauge consists of a rotor (a ring with teeth in regular intervals located on its perimetre) and a sensitive element in a kind подмагниченной coils. The sensitive element of the gauge fixes the moments of passage by it teeths of a rotor and will transform the received information to the electric signals continuously transferred to the module of management ABS. By results of processing of arriving signals ECU receives the information on relative speed of rotation of each of wheels. While all four wheels rotate with identical frequency, ABS stays in a passive condition. As soon as any of wheels starts to be blocked, the management block fixes change of an entering signal and develops a command on operation of the modulator instantly dumping pressure of a hydraulic liquid in the brake mechanism of the corresponding wheel.
The gauge-switch of stoplights
On the signals arriving from the gauge-switch of stoplights, ECU defines the moment when the driver squeezes out a pedal of a foot brake, at once activating ABS.
Diagnostics and regenerative repair
The special control lamp located on an instrument guard of the car notifies on refusals ABS of the driver. As soon as ECU elicits the infringement fact in system, it makes its switching-off. The brake system continues to function thus in a usual mode. Diagnostics of condition ABS is made each time at start of the engine and accompanied by short-term operation of a control lamp. During short time after start the llama should be disconnected automatically.
If control lamp ABS lights up and continues to burn during movement, first of all make sure that the lay brake is completely released, and the brake system functions regularly. If all in norm. Hence, there was refusal ABS. First of all make following elementary checks:
- Check up a condition of brake supports and wheel cylinders;
- Check up a condition and reliability of fastening of contact sockets of electroconducting ECU and wheel gauges (the Onboard electric equipment see the Head).
- Check up corresponding safety locks (the Onboard electric equipment see the Head).
Control lamp ABS does not light up at ignition inclusion
The scheme of an arrangement of contact plugs in socket В100 (in socket F2 of the plug are located mirror)
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1. Try to include ignitions, without making engine start, - if other, a part combinations of devices work control lamps regularly, pass to a following stage of check, otherwise it is necessary to make the necessary regenerative device of an instrument guard.
2. Switch off ignition. Remove a combination of devices and check up a condition of control lamp ABS. In case of need replace a lamp and repeat check.
3. If the lamp is perfectly in order, disconnect contact socket В100 (dark blue colour) from socket F2 located at the left under the panel of devices. Include ignition and measure pressure between weight and the plug 8 sockets В100. If the result of measurement makes more than 3 In, check up an electroconducting condition between a socket and a combination of devices. Make necessary regenerative repair. If pressure on a socket makes less than 3 In, pass to a following stage of check.
4. Switch off ignition. Check up correctness of landing of control lamp ABS in a payment of a combination of devices. Establish into place a combination.
5. Include ignition and repeat pressure gauging. If the result of measurement makes 10 15 In, pass to the following тапу checks, otherwise check up an electroconducting condition between a socket and a combination of devices. Make necessary regenerative repair.
6. Make pressure check between the plug 8 sockets F2 and weight. If the result of measurement makes less than 3 In, pass to a following stage of check, otherwise check up an electroconducting condition between the management block (ECU) ABS and a combination of devices. Make necessary regenerative repair. |
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The scheme of an arrangement of contact plugs in a socket of the block of management (ECU) ABS
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1. Measure resistance between the plug 23 contact sockets of electroconducting ECU ABS and weight. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise check up serviceability of grounding ECU. Make necessary regenerative repair.
2. Measure resistance between weight and the plug 8 socket F2. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise check up a condition of a socket and a plait of its electroconducting. Make necessary regenerative repair, in case of need replace a socket.
3. Switch off ignition and check up serviceability of a condition of contact sockets on a combination of devices, - if signs of infringement of reliability of contacts are absent, replace assemblage ECU ABS with the hydraulic modulator. |
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Control lamp ABS is not disconnected after engine start
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At a detachment of electroconducting from the block of management ABS a part Pads the gauge-switch closes a contour between plugs 31 and 23 sockets, thus there should be an operation of control lamp ABS. |
The scheme of an arrangement of basic components ABS
Site of diagnostic socket DLC and the scheme of an arrangement of its contact plugs
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1. Make sure of completeness of landing and reliability of fixing of a contact socket of electroconducting ECU ABS on assemblage of the hydraulic modulator.
2. Measure resistance between weight and each of diagnostic plugs of socket DLC. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise check up a condition of a plait of electroconducting of socket DLC, make necessary regenerative repair.
3. Switch off ignition and connect the plug № 6 to a diagnostic conclusion.
4. Connect electroconducting to ECU ABS. Measure resistance between weight and the plug № 4 sockets of electroconducting of the block of management. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise check up an electroconducting condition between a diagnostic socket and ECU.
5. Start the engine on single turns and check up pressure between plug "In" on the back party of the generator (the food plug) and weight. If the result of measurement makes 10 15 In, pass to a following stage of check, otherwise replace/repair the generator and repeat check.
6. Switch off ignition. Check up a condition of polar plugs of the battery and reliability of fastening on them клеммных tips of wires. In case of need make necessary corrections.
7. Start the engine on single turns and measure pressure between weight and the plug № 1 contact socket ECU ABS. If the result of measurement makes 10 15 In, pass to a following stage of check, otherwise check up a condition of electroconducting of a chain of giving of a food. Make necessary regenerative repair.
8. Disunite socket В100/F2 in the left top corner of the panel of devices. Include ignition, - if control lamp ABS does not work, pass to a following stage of check, otherwise check up an electroconducting condition on a chain site between a control lamp and socket В100.
9. Switch off ignition and check up a condition of contact plugs of socket ECU ABS. If plugs are perfectly in order, pass to a following stage of check, otherwise replace the management block.
10. Measure resistance between plugs 21 and 23 contact sockets ECU ABS. If the result of measurement makes more than 1 МОм, pass to a following stage of check, otherwise replace assemblage ECU / the hydraulic modulator. |
| 11. Measure resistance between weight and the plug 8 sockets F2. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise make necessary regenerative repair of electroconducting. |
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12. Connect electroconducting to ECU ABS and measure resistance between weight and the plug 8 sockets F2. If the result of measurement makes more than 1 МОм, pass to a following stage of check, otherwise make necessary regenerative repair of electroconducting.
13. Check up a condition and reliability of fixing of a contact socket of electroconducting ECU ABS. In case of need make necessary corrections, or replace the management block / the hydraulic modulator. |
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It is not possible to make reading of codes of malfunctions
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1. Measure resistance between weight and diagnostic plugs of socket DLC. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise make necessary regenerative repair of electroconducting.
2. Switch off ignition. Connect a diagnostic conclusion to the plug № 6 sockets DLC. Disconnect electroconducting from the block of management ABS. Measure resistance between weight and the plug № 4 contact sockets ECU. If the result of measurement makes less than 5 Ohm, pass to a following stage of check, otherwise check up an electroconducting condition on a chain site between socket DLC and the management block. Make necessary regenerative repair.
3. Check up a condition and reliability of fixing of a contact socket of electroconducting ECU ABS. In case of need make necessary corrections, or replace the management block / the hydraulic modulator. |
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Preparation for testing ABS
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1. Make sure of completeness of gymnastics of the battery, check up level of a brake liquid, estimate degree of deterioration of protectors, check up correctness of a rating of tyres.
2. Make sure of absence of signs of leaks in a hydraulic contour of brake system.
3. Estimate degree of deterioration brake колодок and disks, - in case of need make replacement.
4. Make sure of absence of signs “прихватывания” brakes. |
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Check of serviceability of functioning of the hydraulic modulator
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Use for connection to supports of brake mechanisms only special manometres. In order to avoid pollution of a brake liquid do not connect the manometres earlier used for check of hydraulic path АТ! |
Card of diagnostics of serviceability of functioning of hydraulic modulator ABS
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| 1. Turn out gates of prorolling of supports of brake mechanisms of forward wheels. |
| 2. Connect to supports manometres and pump over hydraulic system. Connect diagnostic plugs to plugs №№ 3 and 6 sockets DLC. |
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3. Go into the car forward or back wheels on the stand of brake diagnostics and translate transmission in neutral position. Expose a high-speed mode of testing in 4 or hardly less than km/h. Include ignition, - control lamp ABS should light up approximately for 1.5 seconds, then go out.
4. Within 0.5 seconds after switching-off of a control lamp squeeze out a pedal of a foot brake, - the hydraulic modulator should start to function. Watch indications of the manometres connected to supports, - the modulator should make декомпрессию contours of brake mechanisms of the left and right forward wheels, fixing of pressure and, then, again its raising. Initial pressure should make 35 кГс/см2; depth деко | | |
