Subaru Forester
+ Subaru Forester cars
+ Maintenance instruction
+ Routine maintenance
+ Engine
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Gear shifting box
+ Coupling, transmission line
- Brake system
Specifications
System of anti-blocking of brakes (ABS) - the general information and diagnostic checks
Removal and installation of the main ABS components
Check and adjustment of height of situation and free wheeling of a pedal of a foot brake
Adjustment of a rod of a pusher of GTTs / vacuum amplifier of brakes
Check and adjustment of the drive of the parking brake
Check of serviceability of functioning of the vacuum amplifier of brakes
Replacement of brake shoes of disk brake mechanisms
Removal and installation of supports of disk brake mechanisms
Check of a state, removal and installation of a brake disk
Replacement of boots and service of drum brake mechanisms of back wheels
Removal and installation of components of assembly of the parking brake (model with disk brake mechanisms of back wheels)
Removal and installation of the main brake cylinder
Check of a state and replacement of brake lines and hoses
Removal and installation of assembly of the vacuum amplifier of brakes
Pumping of the brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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System of anti-blocking of brakes (ABS) - the general information and diagnostic checks
General information
Scheme of an arrangement of the main ABS components
On the vehicles equipped with the brake system of usual type, sharp squeezing of a pedal of a foot brake 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) 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. Are among the main ABS components: four wheel sensors, four rotors of wheel sensors, assembly the control unit (ECU) with the hydraulic modulator, the G sensor (the sensor of overloads), the sensor switch of stoplights and a control lamp of ABS.
Control unit and hydraulic modulator
The ABS control unit which is built in in assembly of the hydraulic modulator 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, the module of management 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 hydraulic 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.
Wheel sensors and their rotors
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
On the signals arriving from the sensor switch of stoplights, ECU defines the moment when the driver squeezes out a pedal of a foot brake, at once activating ABS.
Diagnostics and recovery repair
The special control lamp located on an instrument guard of the car notifies on refusals of ABS of the driver. As soon as ECU elicits the violation fact in system, it makes its shutdown. The brake system continues to function at the same time in the usual mode. Diagnostics of a condition of ABS is made every time at start of the engine and is followed by short-term operation of a control lamp. within a short period of time after start the lama has to be disconnected automatically.
If the control lamp of ABS 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 are normal. Therefore, there was ABS refusal. First of all make the following elementary checks: Check a condition of brake supports and wheel cylinders; Check a state and reliability of fastening of contact sockets of an electrical wiring of ECU and wheel sensors (see the Head Onboard electric equipment). Check the corresponding safety locks (see the Head Onboard electric equipment).
The control lamp of ABS does not light up at inclusion of ignition
The scheme of an arrangement of contact plugs in the B100 socket (in the F2 socket of the plug are located specularly)
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1. Try to include ignitions, without making start of the engine, - if the other, being a part of a combination of devices control lamps work regularly, pass to the following stage of check, otherwise it is necessary to make the necessary recovery device of an instrument guard.
2. Switch off ignition. Remove a combination of devices and check a condition of a control lamp of ABS. In case of need replace a lamp and repeat check.
3. If a lamp as it should be, disconnect the contact B100 socket (blue color) from the F2 socket located at the left under the dashboard. Include ignition and measure tension between the weight and the plug 8 of the B100 socket. If the result of measurement makes more than 3 V, check a condition of an electrical wiring between the socket and a combination of devices. Make necessary recovery repair. If tension on the socket makes less than 3 V, pass to the following stage of check.
4. Switch off ignition. Check correctness of landing of a control lamp of ABS in a payment of a combination of devices. Establish into place a combination.
5. Include ignition and repeat measurement of tension. If the result of measurement makes 10 ÷ 15 V, pass to the following tap of check, otherwise check a condition of an electrical wiring between the socket and a combination of devices. Make necessary recovery repair.
6. Make check of tension between the plug 8 of the F2 socket and weight. If the result of measurement makes less than 3 V, pass to the following stage of check, otherwise check a condition of an electrical wiring between the control unit (ECU) of ABS and a combination of devices. Make necessary recovery repair. |
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The scheme of an arrangement of contact plugs in the socket of the control unit (ECU) of ABS
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1. Measure resistance between the plug 23 of the contact socket of an electrical wiring of ECU ABS and weight. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise check serviceability of grounding of ECU. Make necessary recovery repair.
2. Measure resistance between the weight and the plug 8 the F2 socket. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise check a condition of the socket and a plait of its electrical wiring. Make necessary recovery repair, in case of need replace the socket.
3. Switch off ignition and check serviceability of a condition of contact sockets for combinations of devices, - if signs of violation of reliability of contacts are absent, replace assembly of ECU ABS with the hydraulic modulator. |
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The control lamp of ABS is not disconnected after start of the engine
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At an electrical wiring detachment from the ABS control unit the sensor switch which is a part of a block closes a contour between socket plugs 31 and 23, at the same time there has to be an operation of a control lamp of ABS. |
Scheme of an arrangement of the main ABS components
Location of the diagnostic DLC socket and scheme of an arrangement of its contact plugs
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1. Make sure of completeness of landing and reliability of fixing of the contact socket of an electrical wiring of ECU ABS on assembly of the hydraulic modulator.
2. Measure resistance between the weight and each of diagnostic plugs of the DLC socket. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise check a condition of a plait of an electrical wiring of the DLC socket, make necessary recovery repair.
3. Switch off ignition and connect the plug No. 6 to a diagnostic conclusion.
4. Connect an electrical wiring to ECU ABS. Measure resistance between the weight and the plug No. 4 of the socket of an electrical wiring of the control unit. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise check a condition of an electrical wiring between the diagnostic socket and ECU.
5. Start the engine on single turns and check tension between the plug "B" on the back party of the generator (the food plug) and weight. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise replace/repair the generator and repeat check.
6. Switch off ignition. Check a condition of polar plugs of the battery and reliability of fastening for them terminal tips of wires. In case of need make necessary corrections.
7. Start the engine on single turns and measure tension between the weight and the plug No. 1 of the contact ECU ABS socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring of a chain of giving of food. Make necessary recovery repair.
8. Disunite the B100/F2 socket in the left top corner of the dashboard. Include ignition, - if the control lamp of ABS does not work, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site of a chain between a control lamp and the B100 socket.
9. Switch off ignition and check a condition of contact plugs of the ECU ABS socket. If plugs as it should be, you pass to the following stage of check, otherwise replace the control unit.
10. Measure resistance between plugs 21 and 23 of the contact ECU ABS socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise replace assembly of ECU/hydraulic of the modulator. |
| 11. Measure resistance between the weight and the plug 8 of the F2 socket. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring. |
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12. Connect an electrical wiring to ECU ABS and measure resistance between the weight and the plug 8 of the F2 socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring.
13. Check a state and reliability of fixing of the contact socket of an electrical wiring of ECU ABS. In case of need make necessary corrections, or replace the block of management / 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 the weight and diagnostic plugs of the DLC socket. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring.
2. Switch off ignition. Connect a diagnostic conclusion to the DLC socket plug No. 6. Disconnect an electrical wiring from the ABS control unit. Measure resistance between the weight and the plug No. 4 of the contact ECU socket. If the result of measurement makes less than 5 Ohms, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site of a chain between the DLC socket and the control unit. Make necessary recovery repair.
3. Check a state and reliability of fixing of the contact socket of an electrical wiring of ECU ABS. In case of need make necessary corrections, or replace the block of management / the hydraulic modulator. |
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Preparation for ABS testing
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1. Make sure of completeness of battery charging, check the level of brake fluid, estimate degree of wear of protectors, check correctness of a rating of tires.
2. Make sure of lack of signs of leaks in a hydraulic contour of the brake system.
3. Estimate degree of wear of brake shoes and disks, - in case of need make replacement.
4. Make sure of lack of signs of "prikhvatyvaniye" of brakes. |
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Check of serviceability of functioning of the hydraulic modulator
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Use only special manometers for connection to supports of brake mechanisms. In order to avoid pollution of brake fluid do not connect the manometers which are earlier used for check of a hydraulic path of AT! |
Card of diagnostics of serviceability of functioning of the hydraulic ABS modulator
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| 1. Turn out gates of pumping of supports of brake mechanisms of forward wheels. |
| 2. Connect manometers to supports and pump over hydraulic system. Connect diagnostic plugs to plugs No. No. 3 and 6 of the DLC socket. |
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3. Go into the car forward or back wheels on the stand of brake diagnostics and transfer transmission to neutral situation. Expose the high-speed mode of testing in 4 or slightly less than a km/h. Include ignition, - the control lamp of ABS has to light up approximately for 1.5 seconds, then go out.
4. Within 0.5 seconds after shutdown of a control lamp squeeze out a pedal of a foot brake, - the hydraulic modulator has to begin to function. You monitor indications of the manometers connected to supports, - the modulator has to make a decompression of contours of brake mechanisms of the left and right forward wheels, fixing of pressure and, then, its raising again. Initial pressure has to make 35 kgfs/cm2; decompression depth: to 5 kgfs/cm2 (below); the restored pressure: not less than 35 kgfs/cm2.
5. Switch off ignition. Disconnect manometers and repeat check, for contours of mechanisms of back wheels of the car this time. |
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Reading of codes of malfunctions of system of self-diagnostics of ABS
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Previously check serviceability of a state and functioning of a control lamp of ABS (see above). |
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| 1. Find the diagnostic ABS socket. |
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| 2. Switch off ignition and connect one of diagnostic plugs to the plug No. 6 DLC. Include ignition and make reading highlighted by a control lamp of the ECU ABS codes of malfunctions brought in memory of the module of self-diagnostics and execute corresponding from the tests described below (see the table). The first always highlights a control code 11, it is given at the end of the procedure, is equal and as in case of absence in memory of any records. There is a possibility of storage in the buffer at the same time to three codes, and the first is highlighted brought by the last. See also card of tension of contact plugs of the ECU ABS socket. |
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List of codes of malfunctions of ABS
Address also Specifications of the Head of the Control system of the engine.
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code No. |
Cause of failure |
Number of a subject
to execution of the test (see below) |
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11
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Control code |
—
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21
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Break in a chain of the right forward wheel sensor |
1
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22
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Short circuit in a chain of the right forward wheel sensor |
2
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23
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Break in a chain of the left forward wheel sensor |
1
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24
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Short circuit in a chain of the left forward wheel sensor |
2
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25
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Break in a chain of the right back wheel sensor |
1
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26
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Short circuit in a chain of the right back wheel sensor |
2
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27
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Break in a chain of the left back wheel sensor |
1
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28
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Short circuit in a chain of the left back wheel sensor |
2
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29
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Violation of serviceability of delivery of a signal of the wheel sensor |
3
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31
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Failure of the inlet electromagnetic valve
right forward wheel |
4
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32
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Failure of the final electromagnetic valve
right forward wheel |
5
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33
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Failure of the inlet electromagnetic valve
left forward wheel |
4
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34
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Failure of the final electromagnetic valve
left forward wheel |
5
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45
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Failure of the inlet electromagnetic valve
right back wheel |
4
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36
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Failure of the final electromagnetic valve
right back wheel |
5
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37
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Failure of the inlet electromagnetic valve of the left back wheel |
4
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38
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Failure of the final electromagnetic valve of the left back wheel |
5
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41
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Violation of serviceability of functioning of ECU ABS |
6
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42
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Excessively low/high level of supply voltage |
7
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44
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Violation of serviceability of functioning of a control system of AT |
8
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51
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Violation of serviceability of functioning of the valvate relay |
9
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52
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Violation of serviceability of functioning
driving electric motor / its relay |
10
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54
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Violation of serviceability of functioning
sensor switch of stoplights |
11
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56
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Violation of serviceability of delivery of a signal of the G sensor |
12
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Card of tension of contact plugs of the ECU ABS socket
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plug No.
(+) — (–) |
Entrance/output signal |
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Result and conditions of measurement |
Wheel
sensors 2 |
Left forward wheel |
9 ÷ 10
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0.12 ÷ 1 B (20 Hz) |
| Right forward wheel |
11 ÷ 12
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| Left back wheel |
7 ÷ 8
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| Right back wheel |
14 ÷ 15
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| Supply voltage of the valvate relay 1 |
24 ÷ 23
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10 ÷ 15 V at the included ignition |
| Supply voltage of the relay of an electric motor 1 |
25 ÷ 23
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10 ÷ 15 V at the included ignition |
The sensor "G" (it is only full -
driving
models) 2 |
Giving of food |
30 ÷ 28
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4.75 ÷ 5.25 IN |
| Grounding |
28
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— |
| Output signal |
6 ÷ 28
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2.3 ÷ 0.2 In in horizontal position of the car |
| Sensor switch of stoplights 1 |
2 ÷ 23
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Less than 1.5 In at the switched-off stoplights;
10 ÷ 15 V at the included stoplights |
| Control lamp of ABS 2 |
21 ÷ 23
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Less than 1.5 In within 1.5 seconds after inclusion of ignition;
10 ÷ 15 V 1.5 seconds later after inclusion of ignition |
| ABS AT signal (only models with AT) 2 |
31 ÷ 23
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Less than 1.5 In in a passive condition of ABS;
More than 5.5 In at active ABS |
| Monitor of a signal of functioning of ABS 2 |
3 ÷ 23
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Less than 1.5 In in a passive condition of ABS;
More than 5.5 In at active ABS |
Choice
monitor 2 |
Data are accepted |
20 ÷ 23
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Less than 1.5 In in the absence of the obtained data |
| Data are sent |
5 ÷ 23
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4.75 ÷ 5.25 in the absence of the sent data |
Diagnostic
ABS 2 socket |
Plug No. 3 |
29 ÷ 23
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10 ÷ 15 V at the included ignition |
| Plug No. 6 |
4 ÷ 23
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10 ÷ 15 V at the included ignition |
| Giving of food 1 |
1 ÷ 23
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10 ÷ 15 V at the included ignition |
| Grounding |
23
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— |
| Grounding |
26
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— |
Cleaning of memory of the module of self-diagnostics of ECU ABS
Having finished reading, three times within 12 seconds disconnect/connect the diagnostic plug from the DLC socket plug 6. The successful completion of cleaning of memory has to be confirmed by highlighting of a control code 11.
Test No. 1: Break in chains of the wheel sensor, or excessively high level of entrance tension
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1. Switch off ignition. Disconnect an electrical wiring from the corresponding wheel sensor. Measure resistance between the corresponding plugs of the contact socket of the sensor. If the result of measurement does not exceed the limit of the range of 800 ÷ 1200 Ohms, pass to the following stage of check, otherwise replace the sensor.
2. Disconnect an electrical wiring from ECU ABS. Include ignition and measure tension between the weight and the plug No. 1 of the corresponding wheel sensor. If tension is absent, pass to the following stage of check, otherwise replace the sensor.
3. Switch off ignition and connect an electrical wiring to the sensor. Measure resistance between the corresponding ECU ABS plugs (see the table). Measure resistance between the corresponding plugs of the contact socket of the sensor. If the result of measurement does not exceed the limit of the range of 800 ÷ 1200 Ohms, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site between the control unit and the sensor. Make necessary recovery repair. |
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No. of the Diagnostic code (see the list of codes) |
No. No. of plugs of the contact ECU ABS socket |
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21
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11 i12
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23
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9 i10
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25
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13 i15
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27
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7 i8
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No. of the Diagnostic code (see the list of codes) |
No. No. of plugs of the contact ECU ABS socket |
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21
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11
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23
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9
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25
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13
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27
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7
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1. Measure tension between the weight and the corresponding plugs of the contact ECU ABS socket (see the table). If tension takes place, remove the cause of short circuit in a chain on the site between the sensor and ECU ABS. In the absence of tension include ignition and repeat check. If tension is still absent, pass to the following stage of check, otherwise check a condition of an electrical wiring between the sensor and ECU ABS, in case of need remove the cause of short circuit.
2. Check reliability of tightening of bolts of fastening of the sensor and its rotor (see Specifications). In case of need tighten fixture and you pass to the following stage of check.
3. Measure gap size between the sensor and a rotor on all perimeter of the last. At an insufficient gap (see Specifications) make its adjustment by means of special adaptation (26755AA000). If the gap is too big, remove remote laying and replace a rotor or the failed sensor. Having finished adjustment, you pass to the following stage of check.
4. Check wheel nave beating size. If the result of measurement makes less than 0.05 mm, pass to the following stage of check, otherwise replace a nave.
5. Switch off ignition and measure resistance between the weight and the plug No. 1 of the contact socket of the wheel sensor. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise replace the sensor.
6. Switch off ignition and connect an electrical wiring to the wheel sensor. Measure resistance between the weight and the corresponding plug of the contact ECU ABS socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, in opposite check a condition of an electrical wiring on the site of a chain between the sensor and ECU ABS. Make necessary recovery repair. If an electrical wiring as it should be, replace ECU.
7. Check reliability of fastening of contact ECU ABS sockets and the wheel sensor. Make necessary corrections. If contacts as it should be, you pass to the following stage of check.
8. Restore initial connection of all contact sockets. Also repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 2: Short circuit in a chain of the wheel sensor
Check of the wheel sensor on existence of short circuit by means of an oscillograph (in white color the probes connected to the mass of an oscillograph are shown)
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1. Check reliability of tightening of bolts of fastening of the sensor and its rotor (see Specifications). In case of need tighten fixture and you pass to the following stage of check.
2. Measure gap size between the sensor and a rotor on all perimeter of the last. At an insufficient gap (see Specifications) make its adjustment by means of special adaptation (26755AA000). If the gap is too big, remove remote laying and replace a rotor or the failed sensor. Having finished adjustment, you pass to the following stage of check.
3. In the absence of an opportunity to use an oscillograph you pass to check of a mechanical condition of a rotor and cleaning of components.
4. In the presence of an oscillograph the car also establish to a poddomkratta it on props, - wheels have to come off the earth completely. Switch off ignition and connect an oscillograph to the corresponding plugs of the B100 socket in the left top corner of the panel of the device, and also to the 12-contact F55 socket located under an instrument guard. |
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Implementation of this procedure can lead to record in memory of the module of self-diagnostics of an ECU ABS code of malfunction 29. |
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No. of the Diagnostic code (see the list of codes) |
No. No. of plugs of the contact ECU ABS socket |
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22
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A100: 5 and 14
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24
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A100: 7 and 16
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26
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F55: 6 and 7
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28
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F55: 1 and 2
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1. Include ignition and, rotating the corresponding wheel of the car, you monitor indications of an oscillograph. Amplitude of the displayed sinusoidal signal should not exceed the limit of the range of 0.12 ÷ 1.00 B, - if this condition is not satisfied, or the signal has irregular shape, pass to the following stage of check, otherwise pass to implementation of the procedure described in paragraph 4.
2. Attentively examine the wheel sensor and its rotor on existence of signs of damages and pollution. Wipe components, eliminate the malfunctions taking place.
3. Check wheel nave beating size. If the result of measurement makes less than 0.05 mm, pass to the following stage of check, otherwise replace a nave.
4. Switch off ignition. Disconnect an electrical wiring from the corresponding wheel sensor. Measure resistance between the corresponding plugs of the contact socket of the sensor. If the result of measurement does not exceed the limit of the range of 800 ÷ 1200 Ohms, pass to the following stage of check, otherwise replace the sensor.
5. Switch off ignition and measure resistance between the weight and the plug No. 1 of the contact socket of the wheel sensor. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise replace the sensor.
6. Switch off ignition and connect an electrical wiring to the wheel sensor. Measure resistance between the weight and the corresponding plug of the contact ECU ABS socket (see the table). If the result of measurement does not exceed the limit of the range of 800 ÷ 1200 Ohms, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site of a chain between the sensor and ECU ABS. |
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No. of the Diagnostic code (see the list of codes) |
No. No. of plugs of the contact ECU ABS socket |
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22
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9 and 10
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24
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9 and 10
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26
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13 and 15
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28
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7 and 8
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Measure resistance between the weight and the corresponding plugs of the contact ECU ABS socket (see the table). If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise check an electrical wiring between the sensor and ECU for existence of short circuit. Make necessary recovery repair.
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No. of the Diagnostic code (see the list of codes) |
No. No. of plugs of the contact ECU ABS socket |
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22
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11
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24
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9
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26
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13
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28
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7
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1. Measure resistance between the weight and the plug No. 23 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site of a chain between the sensor and I forge ABS.
2. Check reliability of fastening of contact ECU ABS sockets and the wheel sensor. Make necessary corrections. If contacts as it should be, you pass to the following stage of check.
3. Make sure that automobile phone / transmitter of remote control is installed rather far from a plait of an electrical wiring of the wheel sensor.
4. Restore initial connection of all contact sockets and measure resistance between the weight and the corresponding contacts of the screened socket (see the table). If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise replace a screened plait. |
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No. of the Diagnostic code (see the list of codes) |
No. No. of plugs of the contact ECU ABS socket |
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22
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A100: 15
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24
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A100: 6
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26
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F55: 8
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28
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F55: 3
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1. Restore initial connection of all contact sockets and repeat the procedure of reading of diagnostic codes.
2. If no changes (to the best) happened, replace ECU ABS.
3. At emergence of new codes pass to the corresponding test.
4. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 3: The problems connected with serviceability of delivery by the wheel sensor of information signal take place
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Towage and poddomkrachivaniye of the car, and also long keeping of a steering wheel turned out against the stop can lead to record in memory of the module of self-diagnostics of an ECU ABS code of malfunction 29. |
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1. Estimate a condition of protectors and pressure of a rating of tires. In case of need make the corresponding corrections / replacements.
2. Check reliability of tightening of bolts of fastening of the sensor and its rotor (see Specifications). In case of need tighten fixture and you pass to the following stage of check.
3. Measure gap size between the sensor and a rotor on all perimeter of the last. At an insufficient gap (see Specifications) make its adjustment by means of special adaptation (26755AA000). If the gap is too big, remove remote laying and replace a rotor or the failed sensor. Having finished adjustment, you pass to the following stage of check.
4. In the absence of an opportunity to use an oscillograph you pass to check of a mechanical condition of a rotor and cleaning of components. In the presence of an oscillograph the car also establish to a poddomkratta it on props, - wheels have to come off the earth completely. Switch off ignition and connect an oscillograph to the corresponding plugs of the B100 socket in the left top corner of the panel of the device, and also to the 12-contact F55 socket located under an instrument guard.
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Implementation of this procedure can lead to record in memory of the module of self-diagnostics of an ECU ABS code of malfunction 29. |
5. Include ignition and, rotating the corresponding wheel of the car, you monitor indications of an oscillograph. Amplitude of the displayed sinusoidal signal should not exceed the limit of the range of 0.12 ÷ 1.00 B, - if this condition is not satisfied, or the signal has irregular shape, pass to the following stage of check, otherwise pass to implementation of the procedure described above.
6. Attentively examine the wheel sensor and its rotor on existence of signs of damages and pollution. Wipe components, eliminate the malfunctions taking place.
7. Check wheel nave beating size. If the result of measurement makes less than 0.05 mm, pass to the following stage of check, otherwise replace a nave.
8. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 4: Violation of serviceability of functioning of the inlet electromagnetic valve
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1. Disconnect an electrical wiring from ECU ABS.
2. Start the engine on single turns and measure tension between the weight and the plug No. 1 of the contact socket of the control unit. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring between the battery, the switch of ignition and ECU ABS. Make necessary recovery repair.
3. Switch off ignition and measure resistance between the weight and the plug No. 23 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise remove a cause of infringement of quality of grounding of the control unit.
4. Check serviceability of a state and reliability of fixing of contact sockets of an electrical wiring on ECU ABS, the generator and the rechargeable battery. In case of need make the corresponding recovery repair. If violations of quality of contacts are absent, pass to the following stage of check.
5. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 5: Violation of serviceability of functioning of the final electromagnetic valve
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1. 1 Disconnect an electrical wiring from ECU ABS.
2. Start the engine on single turns and measure tension between the weight and the plug No. 1 of the contact socket of the control unit. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring between the battery, the switch of ignition and ECU ABS. Make necessary recovery repair.
3. Switch off ignition and measure resistance between the weight and the plug No. 23 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise remove a cause of infringement of quality of ECU.
4. Check serviceability of a state and reliability of fixing of contact sockets of an electrical wiring on ECU ABS, the generator and the rechargeable battery. In case of need make the corresponding recovery repair. If violations of quality of contacts are absent, pass to the following stage of check.
5. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 6: Violation of serviceability of functioning of the control unit (ECU) of ABS
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1. Switch off ignition. Disconnect an electrical wiring from the ABS control unit and measure resistance between the weight and the plug No. 23 of the contact socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise remove a cause of infringement of quality of grounding of ECU.
2. Check serviceability of a state and reliability of fixing of contact sockets of an electrical wiring on ECU ABS, the generator and the rechargeable battery. In case of need make the corresponding recovery repair. If violations of quality of contacts are absent, pass to the following stage of check.
3. Make sure that automobile phone / transmitter of remote control is installed on sufficient removal from plaits of an electrical wiring of ECU and wheel sensors.
4. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 7: A deviation from supply voltage level face value
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| 1. Start the engine and warm up it up to the normal working temperature. Check correctness of installation of turns of idling. Measure tension between the plug "B" on the back party of the generator and weight. If the result of measurement makes 10 ÷ 17 V, pass to the following stage of check, otherwise check a condition of system of a charge (see the Head Elektrooborudovaniye of the engine) make necessary corrections.
2. Switch off ignition and check a condition of polar plugs of the battery and reliability of fixing for them terminal tips of wires. In case of need smooth out contact surfaces of plugs/tips. If plugs as it should be, disconnect an electrical wiring from the control unit (ECU) of ABS, start the engine on single turns and measure tension between the weight and the plug No. 1 of the contact ECU socket. If the result of measurement makes 10 ÷ 17 V, pass to the following stage of check, otherwise check a condition of an electrical wiring between the switch of ignition and the contact socket of the ABS control unit. Make necessary recovery repair.
3. Switch off ignition and measure resistance between the weight and the plug No. 23 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise remove a cause of infringement of quality of ECU.
4. Check serviceability of a state and reliability of fixing of contact sockets of an electrical wiring on ECU ABS, the generator and the rechargeable battery. In case of need make the corresponding recovery repair. If violations of quality of contacts are absent, pass to the following stage of check.
5. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 8: Violation of serviceability of functioning of a control system of AT
The scheme of an arrangement of plugs in the 24-contact TCM socket
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1. Check marking of assembly of the hydraulic ABS modulator / ECU, - the code is applied on the surface of the block between unions of connection of hydraulic lines and for the models equipped with AT has C7 appearance (on models with RKPP the C8 code is put down). If marking answers a complete set of your car, pass to the following stage of check, otherwise replace assembly of modulator/ECU ABS.
2. Switch off ignition and disconnect an electrical wiring from the module of management of transmission (TCM). Also disconnect an electrical wiring from ECU ABS. Measure resistance between the weight and the plug No. 3 of the contact ECU socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise make recovery repair of an electrical wiring on the site between TCM and ECU ABS.
3. Measure tension between the weight and the plug No. 3 of the contact ECU ABS socket. If the result of measurement makes less than 1 V, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between TCM and ECU ABS. |
| 4. Switch off ignition. Connect an electrical wiring to TCM, then again turn the ignition key in position of ON. Measure tension between the weight and plugs No. 19 and 11 of the 24-contact TCM socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise TCM needs recovery repair, - if violations of serviceability of functioning of AT take place, replace TCM. |
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5. Measure tension between the weight and plugs No. 3 and 31 of the contact ECU ABS socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site between ECU ABS and TCM. Make necessary recovery repair.
6. Check a state and reliability of fixing of contact ECU ABS and TCM sockets. In case of need smooth out plugs and you pass to the following stage of check.
7. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 9: Violation of serviceability of functioning of the valvate relay
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1. Switch off ignition and disconnect an electrical wiring from the ABS control unit. Start the engine on single turns and measure tension between the weight and plugs No. No. 1 and 24 of the contact ECU ABS socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring between the ABS control unit and the rechargeable battery. Make neobkhoidmy recovery repair.
2. Switch off ignition and measure resistance between the weight and the plug No. 23 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise remove a cause of infringement of quality of grounding of the control unit.
3. Measure resistance between plugs No. No. 23 and 24 of the contact ECU ABS socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise replace the control unit.
4. Check serviceability of a state and reliability of fixing of contact sockets of an electrical wiring on ECU ABS, the generator and the rechargeable battery. In case of need make the corresponding recovery repair. If violations of quality of contacts are absent, pass to the following stage of check.
5. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 10: Violation of serviceability of functioning of a driving electric motor / its relay
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1. Switch off ignition. Disconnect an electrical wiring from ECU ABS, then again turn the ignition key in position of ON. Measure tension between the weight and the plug No. 25 of the contact socket of the control unit. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise make recovery repair of an electrical wiring on the site between the battery and ECU ABS. Check a safety lock of the holder of SBF.
2. Switch off ignition and measure resistance between the weight and the plug No. 26 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise make recovery repair of a chain of grounding of the control unit.
3. Start the engine on single turns and measure tension between the weight and the plug No. 1 of the contact ECU ABS socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring on sites between the battery, the switch of ignition and the ABS control unit. Make necessary recovery repair.
4. Switch off ignition and measure resistance between the weight and the plug No. 23 of the contact ECU ABS socket. If the result of measurement makes less than 0.5 Ohms, pass to the following stage of check, otherwise remove a cause of infringement of quality of grounding of the control unit.
5. Make check of serviceability of functioning of the hydraulic modulator (see above). If during check the sound of the rotating electric motor is heard, you pass to the following stage of check, otherwise replace assembly of the ABS modulator/control unit.
6. Check serviceability of a state and reliability of fixing of contact sockets of an electrical wiring on ECU ABS, the generator and the rechargeable battery. In case of need make the corresponding recovery repair. If violations of quality of contacts are absent, pass to the following stage of check.
7. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace assembly of the hydraulic ABS modulator / ECU. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 11: Violation of serviceability of functioning of the sensor switch of stoplights
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1. Check serviceability of operation of stoplights when squeezing a pedal of a foot brake. in case of positive you pass result of check to the following stage of check, otherwise check a condition of lamps and an electrical wiring of a chain of stoplights.
2. Switch off ignition. Disconnect an electrical wiring from ECU ABS. Squeeze out a pedal of a foot brake and measure tension between the weight and the plug No. 2 of the contact socket of the ABS control unit. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site between the sensor switch of stoplights and ECU ABS. Make necessary recovery repair.
3. Check a state and reliability of fixing of contact sockets of the sensor switch and control unit. In case of need make the corresponding corrections. If contacts as it should be, you pass to the following stage of check.
4. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace assembly of the hydraulic ABS modulator / ECU. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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Test 12: Violation of serviceability of delivery of an output signal of the G sensor
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Towage of the car, and also poddomkrachivaniye with a full separation of wheels from the earth can lead it to entering in memory of the module of self-diagnostics of ECU ABS. |
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1. Check marking of assembly of the hydraulic ABS modulator / ECU, - the code is applied on the surface of the block between unions of connection of hydraulic lines and for the models equipped with AT has C7 appearance (on models with RKPP the C8 code is put down). If marking answers a complete set of your car, pass to the following stage of check, otherwise replace assembly of modulator/ECU ABS.
2. Switch off ignition. Remove the central console. Otboltite the G sensor, without disconnecting from it an electrical wiring. Again turn the ignition key in position of ON and measure tension between plugs 1 and 3 from the outer side of the contact socket of the sensor. If the result of measurement makes 4.75 ÷ 5.25 In, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site between the sensor and the control unit (ECU) of ABS. Make necessary recovery repair.
3. Switch off ignition. Disconnect an electrical wiring from ECU ABS and measure resistance between plugs No. No. 28 and 30 (models of 1999 of the issue)/6 and 28 (model of 2000 of the issue) of the contact socket of the control unit. If the result of measurement makes 4.3 ÷ 4.9 kOhm, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between the sensor and ECU ABS.
4. Disconnect an electrical wiring from the G sensor. Measure resistance between the weight and the plug No. 6 of the contact ECU ABS socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between the sensor and ECU ABS.
5. Measure tension between the weight and the plug No. 6 of the contact ECU ABS socket. If the result of measurement makes less than 1 V, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between the sensor and ECU ABS.
6. Repeat the last check at the included ignition. If the result of measurement makes less than 1 V, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between the sensor and ECU ABS.
7. Measure resistance between the weight and the plug No. 28 of the contact ECU ABS socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between the sensor and ECU ABS. If an electrical wiring as it should be, replace assembly of ECU/hydraulic of the modulator. |
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The scheme of placement of contact plugs in the socket of the G sensor
The scheme of placement of contact plugs in the socket of the G sensor
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1. Switch off ignition and, without disconnecting an electrical wiring, you otboltit the G sensor. Check reliability of fixing of contact sockets of the sensor and ABS control unit. Include ignition and measure tension between plugs No. 2 (+) and No. 3 (-) of the contact socket of the sensor of horizontal level. If the result of measurement makes 2.1 ÷ 2.4 B, pass to the following stage of check, otherwise replace the G sensor.
2. Measure tension between plugs 2 (+) and 3 (-) of the contact socket of the sensor of an inclination on 90 ° forward. If the result of measurement makes 3.7 ÷ 4.1 B, pass to the following stage of check, otherwise replace the G sensor.
3. Measure tension between plugs 2 (+) and 3 (-) of the contact socket of the sensor of an inclination on 90 ° back. If the result of measurement makes 0.5 ÷ 0.9 B, pass to the following stage of check, otherwise replace the G sensor.
4. Switch off ignition. Check a state and reliability of fixing of contact sockets of the G and ECU ABS sensor. In case of need make the corresponding recovery repair. If contact connections as it should be, you pass to the following stage of check.
5. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace assembly of the hydraulic ABS modulator / ECU. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections.
6. Switch off ignition and disconnect an electrical wiring from the module of management of transmission (TCM). Also disconnect an electrical wiring from ECU ABS. Measure resistance between the weight and the plug No. 3 of the contact ECU socket. If the result of measurement makes more than 1 megohm, pass to the following stage of check, otherwise make recovery repair of an electrical wiring on the site between TCM and ECU ABS.
7. Measure tension between the weight and the plug No. 3 of the contact ECU ABS socket. If the result of measurement makes less than 1 V, pass to the following stage of check, otherwise make necessary recovery repair of an electrical wiring on the site between TCM and ECU ABS.
8. Switch off ignition. Connect an electrical wiring to TCM, then again turn the ignition key in position of ON. Measure tension between the weight and plugs No. 19 and 11 of the 24-contact TCM socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise TCM needs recovery repair, - if violations of serviceability of functioning of AT take place, replace TCM.
9. Measure tension between the weight and plugs No. 3 and 31 of the contact ECU ABS socket. If the result of measurement makes 10 ÷ 15 V, pass to the following stage of check, otherwise check a condition of an electrical wiring on the site between ECU ABS and TCM. Make necessary recovery repair.
10. Check a state and reliability of fixing of contact ECU ABS and TCM sockets. In case of need smooth out plugs and you pass to the following stage of check.
11. Switch off ignition. Restore initial connection of an electrical wiring. Clear memory of the module of self-diagnostics and repeat the procedure of reading of diagnostic codes. If no changes (to the best) happened, replace ECU ABS. At emergence of new codes pass to the corresponding test. If the refusal did not repeat, therefore, malfunction was temporary, - still make sure of reliability of fastening of all contact connections. |
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