Hyundai accent tagaz not diagnosed abs. Anti-lock braking system
ABS (ABS)
CORRECT BRAKING TECHNIQUESBefore driving after parking, make sure that the parking brake is released and that the brake warning lamp is off.
After driving on water or washing your car, the brakes may become wet. Wet brakes are very dangerous because the car will not be able to stop quickly. To dry the brakes, apply light pressure while driving until braking is normal, being careful not to lose control of the vehicle.
Do not roll downhill in neutral. Always keep the gear in gear while the vehicle is moving, use the brakes to slow the vehicle down, then downshift the gear so that engine braking helps maintain a safe driving speed.
Avoid driving with frequent hard braking. Do not keep your left foot on the brake pedal all the time while driving, as this can be dangerous as it will overheat the brakes and lose their effectiveness. This also leads to increased wear of the brake system components. If a tire puncture occurs while driving, lightly press the brake pedal and try to keep the car straight while reducing speed. When you slow down enough, pull off the road and bring the vehicle to a complete stop in a safe place. If your car is equipped with an automatic transmission, do not slowly move the car forward. To do this, keep your foot on the brake pedal when the car is stopped.
Take precautions when parking on a slope. Apply the parking brake and move the selector to "P" (automatic transmission) or the gear lever to neutral (manual transmission). When parking on a slope, turn the front wheels towards the curb to prevent the vehicle from rolling. When parking on an incline, turn the front wheels away from the curb to prevent the vehicle from rolling. If there is no curb or you need to prevent the vehicle from rolling for other reasons, block the wheels.
In some conditions, your parking brake may freeze in the on position. This happens when snow or ice builds up around the rear brakes, or if the rear brakes are wet. If there is a risk that the parking brake may freeze, apply it only temporarily until you move the selector to the "P" (automatic transmission) position or the shift lever to first or reverse to lock the wheels. car. Then release the parking brake.
Do not use the accelerator pedal to keep the vehicle on a slope. This can lead to overheating of the transmission. Always use the brake pedal or parking brake.
ANTI-LOCK BRAKE SYSTEM
Anti-lock braking system (ABS) prevents the wheels from locking during hard braking or when driving on uneven roads. An electronic anti-lock braking system (ABS) control unit monitors the speed of the vehicle's wheels and regulates the brake fluid pressure in each working brake cylinder. Thus, in emergency situations or on smooth roads, this system improves the vehicle's handling during braking.
During anti-lock braking system (ABS) operation, a slight pulsation may be felt on the brake pedal when braking. You may also hear noise in the engine compartment while driving. These phenomena are normal and indicate that the ABS is working correctly.
Anti-lock braking system (ABS) will not be able to prevent accidents due to improper or dangerous maneuvering. While it helps to improve the vehicle's handling during emergency braking, always maintain a safe distance from the vehicle in front. The vehicle speed must be reduced in unfavorable driving conditions.
In the following cases, the braking distance of cars with ABS anti-lock braking system may be longer than that of cars without it:
- when driving on gravel roads and roads covered with snow;
- when driving with anti-skid chains installed;
- when driving on roads with bumps, holes, etc., on bumpy roads or other poorly surfaced roads.
Travel speed on such roads should be reduced. Do not test the safety of a vehicle equipped with Anti-lock Braking System (ABS) by cornering or driving on high speeds, as it can be dangerous for you and others.
Anti-lock braking system (ABS) manages the hydraulic pressure in the brakes of all four wheels during hard braking and braking at hazardous road surface, which prevents the wheels from locking. The cycle of braking and free wheel rotation occurs very quickly and continues until the vehicle stops or until the brake pedal is released.
Benefits of ABS:
- provides vehicle controllability with high degree reliability even with heavy braking;
- provides a vehicle stop during emergency braking while maintaining stability and controllability even in turns.
In the event of malfunctions, a diagnostic function and a safety (backup) system are provided.
Anti-lock braking system
|
Element |
Parameter |
Nominal value |
Note |
|
ECU (electronic Control block) |
Working voltage, V Working temperature, ° С |
10-16 40…+110 |
Combined ABS and EBD control unit |
|
ABS warning lamp Brakes (EBD) |
Working voltage, V Consumption current, mA |
Brakes: parking, brake fluid, EBD failure |
|
|
HECU (hydraulic and electronic control unit) |
Weight, kg Engine power, W Pump feed, cm 3 / s Battery capacity, cm 3 Working voltage valves NO, NC, B |
180 (12V, 30A) 2.1 (LPA) 6 (NRA) |
NO normally open, NC normally closed, LPA - low pressure accumulator, HPA - high pressure accumulator |
Electronic brake force distribution (EBD)
The EBD electronic brake force distribution is installed in addition to the pressure regulator to ensure ideal distribution of brake fluid pressure to the front and rear brakes. This prevents the rear wheels from locking when braking and ensures increased efficiency brakes.
Advantages of using electronic brake force distribution:
- functional improvement of the basic braking system;
- compensation for various coefficients of adhesion to the road;
- no need to install a pressure regulator;
- malfunctions are identified using the monitoring system.
Comparison of pressure regulator and electronic brake force distribution (EBD) can be found on rice. 7.3.
Checking the voltage at the contacts of the connector of the hydraulic unit HECU
When checking the performance of the anti-lock braking system, first of all, it is necessary to check the voltages and resistances on the contacts of the connector of the hydraulic unit HECU, which must correspond to the values given in table. 7.2.
Table 7.2
Voltage and resistance at the contacts of the connector of the hydraulic unit HECU
|
Contact No. |
Description |
State |
Voltage output |
|
AB voltage supply 1. Power supply for the solenoid valve |
Constantly |
On-board system voltage |
|
|
Ground connection |
Always (in the ABS control unit) |
||
|
Diagnostic connector contact (K-line) |
Instrument connection Hi-Scan |
||
|
Resistance R = 1275-1495 Ohm |
|||
|
Left rear wheel speed sensor Left front wheel speed sensor Right front wheel speed sensor Right rear wheel speed sensor |
|||
|
Power supply via switch ignition |
Ignition on |
High voltage detection V: 16V |
|
|
7, 11, 12, 13,14, 16, 21, 25 |
Not used |
||
|
AB voltage supply 2. Motor power supply |
Constantly |
||
|
Ground connection - 2 (engine) |
G 07 |
||
|
ABS relay control |
|||
|
EBD relay control |
|||
|
Brake light switch |
Bleeding the hydraulic brake actuator
The operation must be carried out to ensure correct bleeding and filling of the ABS unit, brake pipes and master cylinder with brake fluid.
1. Remove the cap from the reservoir and fill with fresh brake fluid up to the upper mark on the reservoir. When bleeding air, make sure that the brake fluid level does not fall below the middle of the reservoir.
2. Place a clear plastic tube over the bleed screw and lower the other end of the tube into a clear plastic container half filled with brake fluid (see illustration). rice. 7.1).
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|
Rice. 7.4. Connecting the Hi-Scan device to the diagnostic socket |
3. Connect the Hi-Scan to the diagnostic socket located under the front panel ( rice. 7.4).
4. Select the operating mode according to the instructions on the Hi-Scan screen:
- select the diagnostic mode for Hyundai cars;
- select the name of the car;
- select an anti-lock braking system;
- select the air removal mode;
- press "YES" to operate the pump motor and solenoid valve;
- wait 60 seconds before starting work to remove air (if this is not done, the engine may be damaged).
5. Press the brake pedal several times, then loosen the bleed screw until fluid starts to flow. Without releasing the pedal, tighten the bleed screw.
6. Repeat steps 5 for each wheel until there are no air bubbles in the flowing brake fluid.
7. Tighten the bleed screw to 7-9 Nm.
8. Repeat the described procedure for each wheel in the sequence shown on rice. 7.2.
Identifying faults
During the operation of the anti-lock braking system, the phenomena shown in table may occur. 7.3 which are not malfunctions.
Table 7.3
Normal phenomena that can occur when the anti-lock braking system is operating
|
Phenomenon |
Cause of occurrence |
|
Knocks when checking the readiness of the brake system |
When starting the engine, knocking can sometimes be heard from the engine compartment. This happens when checking the operation of the system. and is not considered a deviation from the norm |
|
Sound when working ABS |
1. From the engine inside the ABS hydraulic unit during operation (howling) 2. Appears in conjunction with vibration of the brake pedal (scraping sound) 3. When ABS is working, the sound comes from the chassis of the car due to the cyclic action and release of the brakes (knock - suspension, creak - tires) |
|
ABS operation (long braking distance) |
On uneven surfaces (snowy and gravel roads), the braking distance for vehicles with ABS can sometimes be longer than for other vehicles. For this reason, on such roads, you should drive at a reduced speed and be very careful |
Fault codes
Identifying DTCs with Hi-Scan
1. Switch off the ignition.
2. Connect the Hi-Scan to the diagnostic socket located under the front panel ( rice. 7.5).
3. Switch on the ignition.
4.Use the Hi-Scan to check for any diagnostic codes.
5. After completing the repair or adjustment, erase the codes from memory.
6. Disconnect the Hi-Scan.
Fault code table
The codes and causes of malfunctions, as well as the elements that caused the malfunctions, are given in table. 7.4.
Table 7.4
Fault codes for ABS brakes
|
The code malfunctions on the Hi + Scan device |
Defective the elements |
Cause malfunctions |
Conditions definitions |
|
C2 402 |
Engine relay. Engine (ECU, wiring harness) |
Engine short circuit to battery Open in the engine circuit |
The controller starts monitoring the motor after 1.8 s from the moment when the motor relay is disconnected if the motor voltage is higher than the criterion for 200 ms The controller starts monitoring the motor after 1.8 s from the moment when the motor relay is disconnected if the motor voltage is higher than the criterion for 200 ms |
|
C1 102 |
Power circuit |
Low voltage |
1. When the ignition voltage is less than 9.4V for 500ms 2. If the voltage increases more than 9.6V, then the control returns to normal state. 3. When the ignition voltage is less than 7.2 V, it is detected in state 1 4. If the voltage increases more than 7.5 V, the controller returns to state 1 |
|
C1 101 |
Overvoltage |
1. When the ignition voltage is more than 16V for 500ms or more 18 V for 49 ms 2. If the voltage returns to normal range, the controller is reset |
|
|
C1 604 |
EEPROM memory defective Malfunctioning ECU |
After the main processor writes the predetermined data into the EEPROM, it reads the data, compares it with each other and determines that they are different from each other. If the main / worker processor detects abnormal operation of the RAM memory, the state of the registers, the timer interrupts, AC / DC Converter and Cycle Times |
|
|
FL (front left wheel) - C1 202, FR (front right wheel) - C1 205, RL (rear left wheel) - C1 208, RR (rear right wheel) - C1 211 |
Long-term ABS mode |
1. During the ABS control cycle, if the wheel is moving at a speed of 2 km / h for more than 12 s 2. If the ABS control cycle lasts more than 36 seconds |
|
|
C2 112 |
Valve relay (ECU, wire harness) |
Breaking the chain Short circuit |
the valve is out of range and this continues within 56 ms When the valve relay is energized, the reference voltage of the relay valve is higher than required and this continues for 56 ms |
|
C1 604 |
Solenoid valve (ECU, wire harness) |
Open circuit, short circuit, current leaks |
1. When the valve relay is de-energized, the reverse voltage of the solenoid drive MOSFET is higher than required and this continues for 56ms. 2. When the valve relay turns on and the solenoid turns off, the reverse voltage of the solenoid drive transistor (MOSFET) is lower than required and this continues for 56ms. 3. When the valve relay and solenoid turn on, the reverse the voltage of the transistor (MOSFET) of the solenoid drive is higher than required and this continues for 56 ms |
|
C2 402 |
Engine relay. Engine (ECU, wire harness) |
Motor relay or fuse, break, motor short to ground Engine blocking |
When the motor relay is energized, the motor reference voltage is lower than required and this continues for 49ms The controller starts monitoring the motor voltage within 84 ms from the moment the motor relay is de-energized. If the motor voltage is lower than the required one for 49 ms after 1.8 s from the moment the motor is switched off, the motor is switched on again for 1 s and the specified check is repeated again. On the second check, when the motor voltage is lower than the required one for 49 ms, the controller recognizes a malfunction |
|
FL (front left wheel) - C1 200, FR (front right wheel) - C1 203, RL (rear left wheel) - C1 206, RR (rear right wheel) - C1 209 |
Sensor (wires, active element, ECU) |
Short circuit to ground; short circuit to battery; chain break |
Wheel speed is less than 7 km / h, sensor bias voltage is out of range (2.15-3.5 V), if it is with; standing lasts more than 140 ms |
|
FL - C1 201, FR - C1 204, RL - C1 207, RR - C1 210 |
Speed jump |
A wheel deceleration of -100 g (-25 km / h in 7 ms) causes the controller to monitor this value and compares the wheel speed with the vehicle speed from the next cycle. When -100 g deceleration continues for more than 140 ms, the controller detects a fault |
|
|
FL - C1 202, FR - C1 205, RL - C1 208, RR - C1 211 |
Large air gap |
This check is carried out during the period when the minimum speed increases from 2 to 10 km / h. 1. When the minimum wheel speed is 2 km / h, and the speed of the other wheels is over 10 km / h with an acceleration of more than 0.4 g, the controller starts comparing the wheel speeds with each other. If the difference is below 4 km / h and continues for 140 ms 2. Except case 1, when the minimum wheel speed is 2 km / h, and the maximum wheel speed exceeds 10 km / h and this condition continues for 20 s |
|
|
FL - C1 201, FR - C1 204, RL - C1 207, RR - C1 210 |
Active element defective |
1. The maximum wheel speed is over 20 km / h, and the wheel speed is 40% of the maximum wheel speed. If this condition continues for 1 min 2. The maximum wheel speed is over 40 km / h, and the wheel speed is 60% of the maximum wheel speed. If this condition continues for 30 s |
Checking the output voltage of the ABS sensor
1. Raise the vehicle and release the parking brake lever.
2. Disconnect the connector from the hydraulic unit HECU and measure from the connector side located on the wire side. The pin numbers of the connector for checking the output voltage of the ABS sensors of the corresponding wheels are given in table. 7.5. The output voltage when measured with an oscilloscope is at least 100 mV.
Table 7.5
Connector pin numbers for checking the output voltage of ABS sensors
corresponding wheels
|
Front left wheel |
Front right wheel |
Rear left wheel |
Rear right wheel |
|
WARNING Remove the double protectors from the connectors and insert the meter probe into the connector from the harness side (rear). When installing the probe on the contact side, it is difficult to make a reliable connection. 3. Disconnect the HECU and engine connector. Installation 1. Installation is carried out in the reverse order of removal. 2. Tighten the modulator mounting bolts and brake pipe nuts to the specified torque. Tightening torques: - HECU mounting bolt - 8-10 Nm; - nut for fastening the brake pipe - 13–17 N · m. Wheel speed sensors Withdrawal 1. Remove the front wheel speed sensor mounting bolt and, after disconnecting the connector, remove the sensor ( rice. 7.7). 2. Remove the rear seat cushion. 3. Remove the rear pillar trim. 4. Remove the rear wheel. 5. Remove the rear wheel speed sensor mounting bolt and after disconnecting the connector, remove the sensor ( rice. 7.8). Examination 1. Connect an ohmmeter between the terminals of the wheel speed sensor and measure the resistance. Nominal resistance: - front wheel sensor - 1275-1495 Ohm; - rear wheel sensor - 1275-1495 Ohm. 2. With a wheel speed sensor installed on the car, connect a voltmeter to the sensor connector contacts and, turning the wheel, measure the voltage. A defective ABS does not disengage the vehicle's braking system. But every driver who drove a Hyundai Accent with a safety light on, knows how much more difficult it becomes to control a car in such conditions. It is dangerous to pull with the repair of the abs blockThe braking distance is lengthened, the brake pedal “stiffens”, it is not possible to react quickly to a neighbor's maneuver. This is how emergencies arise. Therefore, the company "Autopilot" recommends timely repair of the ABS Hyundai Accent. The Moscow service center is well aware of all the "diseases" of this block, typical for this model at 3-4 years of age. Most often, this is a blocking of the motor: there is a hole in the protective cylinder through which condensate is removed from the system, through which dirt, dust, and small crumbs enter the module. The problem is solved in different ways, depending on the degree of "neglect" of the problem. The bulkhead of the motor often helps - it will cost less. But it must be performed by professionals: the elements of the module are located in a hard-to-reach place, therefore, it is necessary to repair the ABS on Hyundai Accent on special sites with the appropriate equipment at hand. Prices do not "bite" everywhereThe service center "Autopilot" has its own warehouse of parts - original and non-original for the driver's choice. So you don't have to worry about crazy costs, even if the entire block has to be changed due to corrosion and deposits. If desired, the client can himself be present in the repair area. These specialists are well versed in assembling all Hyundai models and are always ready to show you how to do it correctly. In addition to replacing or restoring the ABS system, Hyundai Autopilot will perform any necessary operations for the car. It has everything required for high-quality, fast and professional diagnostics, prevention, regular and unscheduled maintenance of the “Russian ten”. Diagnostics of failures of ABS ABS warning lamp connection diagramA special warning lamp located on the dashboard of the car notifies the driver about ABS failures. As soon as the ABS control module detects a violation in the system, it turns it off. The brake system continues to function normally. Diagnostics of the ABS condition is carried out every time the engine is started and is accompanied by a short-term operation of the warning lamp. Within a short time after starting up, the lamp should automatically shut down. If the ABS warning lamp comes on and stays on while driving, first check that the parking brake is fully released and that the braking system is functioning properly. If everything is OK, then the ABS has failed. First of all, make the following simple checks: a) Check the condition of the brake calipers and wheel cylinders; Switch off the ignition. Remove the instrument cluster, remove the ABS warning lamp and check its condition. If the lamp is burnt out, replace it, otherwise go to the next step of the check. Disconnect terminal pair B62 / F45 and measure the voltage between chassis ground (-) and terminal No. G6 (+) of B62 connector. If the measurement result is less than 3 V, go to the next step of the check, otherwise, check the condition of the wiring of the corresponding warning lamp. Make any necessary refurbishment. Switch off the ignition, put the test lamp under test in its original place and install the instrument cluster. Turn on the ignition and repeat the voltage measurement. If the measurement result is within the range of 10 ÷ 15 V, go to the next step of the check, otherwise check the condition of the wiring. Make any necessary refurbishment. Ignition OFF, perform a voltage test between the F45 terminal G6 (+) and chassis ground. If the measurement result is less than 3 V, go to the next step of the check, otherwise check the condition of the corresponding wiring. Make any necessary refurbishment. Switch on the ignition and recheck. If the measurement result is less than 3 V, go to the next step of the check, otherwise, check the condition of the wiring of the corresponding warning lamp. Make any necessary refurbishment. Measure resistance between the No. 23 terminal of F49 connector and ground. If the measurement result is less than 5 ohms, go to the next step of the check, otherwise check the serviceability of the grounding of the control module / hydromodulator assembly. Make any necessary refurbishment. Measure the resistance between ground and terminal G6 connector F45. If the measurement is less than 5 ohms, go to the next step, otherwise check the condition of the connector and its wiring harness. Carry out the necessary refurbishment, if necessary replace the connector. Switch off the ignition and check the condition of the connectors on the circuit between the instrument cluster and the ABS control module - if there are no signs of poor contacts reliability, replace the ABS control module / hydromodulator assembly. Measure the resistance between chassis ground and each (A and B) of the diagnostic terminals (B81). If the measurement result is less than 5 ohms, go to the next step of the check, otherwise check the condition of the corresponding wiring harness, make the necessary refurbishment. Ignition OFF and connect the diagnostic terminal to the B82 diagnostic connector No. 8 terminal. Disconnect the ABS control module connector and measure the resistance between the No. 4 terminal of F49 and chassis ground. If the measurement result is less than 5 ohms, go to the next step of the check, otherwise check the condition of the wiring on the circuit between the ABS control module and the diagnostic connector, make the necessary restorative repair. Run the engine at idle speed and check the voltage between the B (+) terminal on the rear of the alternator (power terminal) and chassis ground. If the measurement result does not go beyond the range of 10 ÷ 15 V, go to the next step of the check, otherwise replace / repair the generator (see Chapter) and repeat the check. Switch off the ignition and check the condition of the battery terminal blocks and the reliability of the attachment of the terminal lugs of the wires on them. Make the necessary corrections if necessary. Disconnect the ABS control module wiring connector, then idle the engine and measure the voltage between the No. 1 (+) terminal of F49 and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, go to the next step of the check, otherwise check the condition of the power supply circuit wiring. Make any necessary refurbishment. Disconnect terminal pair B62 / F45 and turn on the ignition - if the ABS warning lamp does not work, go to the next test step, otherwise check the condition of the front wiring harness. Switch off the ignition and check the condition of the projections on the control module connector terminals. If the terminals are ok, go to the next step of checking, otherwise replace the control module / hydromodulator (see Section). Measure the resistance between the # 22 and # 23 connector of the ABS control module. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise replace the assembly of the ABS control module / hydromodulator (see Section Removal, installation and serviceability check of the assembly of the control module / hydromodulator ABS). Measure the resistance between the F45 terminal G6 and chassis ground. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise make the necessary restoration repairs to the wiring. Connect the wiring harness to the ABS control module and measure the resistance between terminal G6 of connector F45 and chassis ground. If the measurement result is more than 1 megohm, go to the next stage of the check, otherwise make the necessary restoration repairs to the wiring. Check the condition and tightness of the ABS control module connector. If necessary, make the necessary corrections or replace the control module / hydromodulator block. Unable to read fault codes If the test lamp turns on and off properly, but does not light up the initial code (DTC 11, - see below) when entering the diagnostic mode, turn off the ignition and carry out the checks. Failures of the wheel sensors lead to a malfunction of the functioning of the ABS. The wheel sensors connection diagram is shown in the illustration. Open in wheel sensor circuit or excessively high input voltage (DTCs # 21, 23, 25, and 27) Disconnect the wiring harness from the ABS control module and measure the voltage between the No. 1 terminal of the appropriate wheel sensor and chassis ground. If the measurement result is less than 1 V, go to the next step of the check, otherwise replace the sensor. Switch on the ignition and repeat the previous check. If the measurement result is less than 1 V, go to the next step of the check, otherwise replace the sensor. Switch off the ignition and connect the electrical wiring to the sensor. Measure the resistance between terminals # 11 and 12 (DTC 21) / 9 and 10 (DTC 23) / 14 and 15 (DTC 25) / 7 and 8 (DTC 27) of connector F49. If the measurement result is within the range of 1 ÷ 1.5 kOhm, go to the next step of the check, otherwise check the condition of the wiring in the area between the control module and the sensor. Make any necessary refurbishment. Measure the voltage between ground and terminal No. 11 (DTC 21) / 9 (DTC 23) / 14 (DTC 25) / 7 (DTC 27) at connector F49. If the measurement is more than 1 V, eliminate the cause of the short circuit between the sensor and the ABS control module. If there is no voltage (less than 1 V), turn on the ignition and repeat the test. If there is still no voltage (less than 1 V), go to the next step of the check, otherwise check the condition of the wiring between the sensor and the ABS control module, if necessary, eliminate the cause of the short circuit. Measure the size of the gap between the sensor and the rotor along the entire perimeter of the latter. With insufficient clearance (see. Specifications) correct it by selecting an adjusting gasket (26755AA000). If the gap is too large, remove the spacers and replace the rotor (complete with hinge assembly) or the failed sensor. After finishing the adjustment, proceed to the next step of the check. Ignition OFF, measure the resistance between the wheel sensor connector terminal No. 1 and chassis ground. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise replace the sensor. Switch off the ignition and connect the wiring harness to the wheel sensor. Measure the resistance between chassis ground and terminal No. 11 (DLC 21) / 9 (DLC 23) / 14 (DLC 25) / 7 (DLC 27) connector F49. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise check the condition of the wiring on the circuit between the sensor and the ABS control module. Make any necessary refurbishment. If the wiring is OK, replace the control module / hydromodulator assembly. Restore the original connection of all connectors, clear the processor memory (see below) and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, proceed with the appropriate check. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. If it is not possible to use an oscilloscope, proceed to checking the mechanical condition of the rotor and cleaning the components. If you have an oscilloscope, jack up the car and place it on supports - the wheels should be completely off the ground. Switch off the ignition and connect an oscilloscope between terminals # C5 (+) and B5 (-) (DTC 22) / C6 (+) and B6 (-) (DTC 24) of connector B62 or 1 (+) and 2 (-) (DTC 26) / 4 (+) and 5 (-) (DTC 28) connector F55. Turn on the ignition and, rotating the corresponding wheel of the car, observe the oscilloscope readings. The amplitude of the sinusoidal signal displayed on the screen should not exceed the range of 0.12 ÷ 1.00 V, - if this condition is not met, or the signal has an irregular shape, go to the next stage of the check. Check the runout value of the wheel hub. If the measurement result is less than 0.05 mm, go to the next check step, otherwise replace the hub. Switch off the ignition. Disconnect the wiring harness from the appropriate wheel sensor. Measure the resistance between the # 1 and # 2 terminals of the sensor connector. If the measurement result is within the range of 1 ÷ 1.5 kOhm, proceed to the next stage of verification, otherwise replace the sensor. Measure the resistance between ground and the No. 1 terminal of the wheel sensor. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise replace the sensor. Connect the wiring harness to the wheel sensor and disconnect it from the ABS control module. Measure the resistance between terminals # 11 and 12 (DTC 22) / 9 and 10 (DTC 24) / 14 and 15 (DTC 26) / 7 and 8 (DTC 28) of the ABS control module connector F49. If the measurement result does not go beyond the range of 1 ÷ 1.5 kOhm, go to the next step of the check, otherwise, make the necessary restoration repair of the electrical wiring in the section of the circuit between the sensor and the ABS control module / hydromodulator. Measure the resistance between chassis ground and the No. 11 (DTC 22) / 9 (DTC 24) / 14 (DTC 26) / 7 (DTC 28) terminal of the F49 control module connector. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise check the wiring between the sensor and the module for a short circuit. Make any necessary refurbishment. Measure the resistance between ground and the No. 23 terminal of F49. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise eliminate the cause of the violation of the grounding quality. Check the tightness of the connectors of the ABS control module and the wheel sensor. Make the necessary corrections. If the contacts are in order, proceed to the next step of verification. Make sure the car phone / remote control transmitter is installed at a sufficient distance from the wheel sensor wiring harness. Repair the original wiring of all connectors and measure the resistance between ground and the No. A5 (DTC 22) / A6 (DTC 24) terminal B62. If the measurement is less than 0.5 ohm, go to the next step, otherwise replace the shielded harness. Restore the original connection of all connectors and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Check the tightness of the ABS sensor mounting bolts (32 Nm). If necessary, tighten the fasteners and proceed to the next step of the check. Measure the size of the gap between the sensor and the rotor along the entire perimeter of the latter. If there is insufficient clearance (see Specifications), correct it by selecting an adjusting shim (26755AA000). If the gap is too large, remove the spacers and replace the rotor (complete with hinge assembly) or the failed sensor. After completing the adjustment, proceed to the next step of the check. If it is not possible to use an oscilloscope, proceed to checking the mechanical condition of the rotor and cleaning the components. If you have an oscilloscope, jack up the car and place it on supports - the wheels should be completely off the ground. Switch off the ignition and connect an oscilloscope between terminals # C5 (+) and B5 (-) (DTC 22) / C6 (+) and B6 (-) (DTC 24) of connector B62 or 1 (+) and 2 (-) (DTC 26) / 4 (+) and 5 (-) (DTC 28) connector F55. Turn on the ignition and, rotating the corresponding wheel of the car, observe the oscilloscope readings. The amplitude of the sinusoidal signal displayed on the screen should not exceed the range of 0.12 ÷ 1.00 V, - if this condition is not met, or the signal has an irregular shape, go to the next stage of the check, otherwise go to the next check. Carefully inspect the wheel sensor and its rotor for signs of damage or contamination. Wipe down components, fix any problems. Check the runout value of the wheel hub. If the measurement result is less than 0.05 mm, go to the next check step, otherwise replace the hub. Switch off the ignition. Reconnect the original wiring connections. Clear the processor memory (see below) and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Run the engine at idle speed and measure the voltage between the No. 1 (+) terminal of the F49 ECM connector and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, go to the next step of the check, otherwise check the condition of the wiring between the battery, the ignition switch and the ABS control module. Make any necessary refurbishment. Ignition OFF, measure the resistance between chassis ground and the No. 23 terminal of connector F49. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise eliminate the cause of the violation of the grounding quality. Violation of serviceability of functioning of the ABS control module (DTC 41) Switch off the ignition. Disconnect the wiring harness from the ABS control module and measure the resistance between the No. 23 terminal of F49 and chassis ground. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise eliminate the cause of the violation of the grounding quality. Check the condition and reliability of the electrical wiring connectors on the ABS control module, generator and battery. Carry out appropriate refurbishment if necessary. If there are no violations of the quality of contacts, proceed to the next stage of verification. Make sure the car phone / remote control transmitter is installed at a sufficient distance from the ABS wiring harness. Switch off the ignition. Reconnect the original wiring connections. Clear the processor memory and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Switch off the ignition and check the condition of the battery terminal blocks and the reliability of fixing the terminal lugs of the wires on them. If necessary, clean the contact surfaces of the terminals / lugs. If the terminals are OK, disconnect the wiring from the ABS control module, idle the engine and measure the voltage between ground and the No. 1 (+) terminal of F49 connector. If the measurement result is within the range of 10 ÷ 17 V, go to the next step of the check, otherwise check the condition of the wiring between the ignition switch and the connector of the ABS control module. Make any necessary refurbishment. Ignition OFF, measure the resistance between the No. 23 terminal of F49 connector and chassis ground. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise eliminate the cause of the violation of the grounding quality. Check the condition and reliability of the electrical wiring connectors on the ABS control module, generator and battery. Carry out appropriate refurbishment if necessary. If there are no violations of the quality of contacts, proceed to the next stage of verification. Switch off the ignition. Reconnect the original wiring connections. Clear the processor memory and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Ignition OFF, disconnect the two transmission control module (TCM) wiring connectors. Also disconnect the wiring harness from the ABS control module. Measure the resistance between the No. 3 terminal of F49 connector and chassis ground. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise, re-establish the electrical wiring between the TCM and the ABS control module. Ignition ON, measure the voltage between ground and the No. 3 terminal of F49. If the measurement result is less than 1 V, go to the next step of the check, otherwise make the necessary restoration of the electrical wiring in the area between the TCM and the ABS control module. Measure the voltage between ground and terminals # 3 and # 31 of connector F49. If the measurement result is within the range of 10 ÷ 15 V, go to the next step of the check, otherwise check the condition of the wiring in the area between the ABS control module and the TCM. Make any necessary refurbishment. Check the condition and tightness of the connectors on the ABS and AT control modules. If necessary, strip the terminals and proceed to the next step of the check. Switch off the ignition. Reconnect the original wiring connections. Clear the processor memory and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Violation of serviceability of functioning of the valve relay (DTC 51) Measure the resistance between the # 23 (+) and # 24 (-) control module connector terminals. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise replace the control unit. Check the condition and reliability of the electrical wiring connectors on the ABS control module, generator and battery. Carry out appropriate refurbishment if necessary. If there is no violation of the quality of the contacts, proceed to the next stage of the check. Switch off the ignition. Reconnect the original wiring connections. Clear the processor memory and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Ignition OFF, measure the resistance between ground and the No. 26 terminal of F49. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise, make a refurbishment of the ground circuit of the control unit. Run the engine at idle speed and measure the voltage between the No. 1 terminal of connector F49 and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, go to the next step of the check, otherwise check the condition of the wiring in the areas between the battery, the ignition switch and the ABS control module. Make any necessary refurbishment. Ignition OFF, measure the resistance between ground and the No. 23 terminal of F49. If the measurement result is less than 0.5 Ohm, go to the next step of the check, otherwise eliminate the cause of the violation of the grounding quality. During the check of the sequence of operation of the hydromodulator valves (see Section Checking the sequence of valve actuation of the hydromodulator ABS) check the correct functioning of the electric motor by ear. If the motor rotates properly, go to the next step of the check, otherwise replace the modulator / ABS control unit assembly. Check the condition and reliability of the wiring connectors on the assembly of the ABS control module / hydromodulator, generator and battery. Carry out appropriate refurbishment if necessary. If there are no violations of the quality of contacts, proceed to the next stage of verification. Switch off the ignition. Reconnect the original wiring connections. Clear the processor memory and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. Check the correct operation of the brake lights when depressing the foot brake pedal. If everything is in order, go to the next step of the check, otherwise check the condition of the lamps and wiring of the brake light circuit. Switch off the ignition. Disconnect the wiring harness from the ABS control module. Depress the foot brake pedal and measure the voltage between the No. 2 terminal of the ABS control module F49 connector and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, go to the next step of the check, otherwise check the condition of the wiring in the area between the brake light switch and the ABS control module. Make any necessary refurbishment. Check the condition and tightness of the sensor-switch and control unit connectors. Make the appropriate corrections if necessary. If the contacts are in order, proceed to the next step of verification.
Switch off the ignition. Disconnect the wiring from the ABS control module and measure the resistance between the # 6 and # 28 terminals of the control module F49 connector. If the measurement result is within the range of 4.3 ÷ 4.9 kOhm, go to the next stage of the check, otherwise, make the necessary restoration repairs to the wiring in the area between the sensor and the ABS control module. Disconnect the electrical wiring from the G-sensor. Measure resistance between the No. 6 terminal of F49 connector and chassis ground. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise, make the necessary restoration repairs to the electrical wiring in the area between the sensor and the ABS control module. Measure the voltage between the No. 6 terminal of F49 connector and chassis ground. If the measurement result is less than 1 V, go to the next step of the check, otherwise make the necessary restoration repairs to the wiring in the area between the sensor and the ABS control module. Repeat the last check with the ignition on. If the measurement result is less than 1 V, go to the next step of the check, otherwise, make the necessary refurbishment of the wiring in the area between the sensor and the ABS module. Measure the resistance between ground and the No. 28 terminal of F49. If the measurement result is more than 1 megohm, go to the next step of the check, otherwise, make the necessary restoration repairs to the electrical wiring in the area between the sensor and the ABS control module. If wiring ok, replace control module / hydraulic modulator assembly. Turn off the ignition and, without disconnecting the wiring, screw off the G-sensor. Check the tightness of the connectors of the sensor and the ABS control module. Switch on the ignition and measure the voltage between terminals No. 2 (+) and No. 3 (-) of the R70 sensor connector. If the measurement result is within the range of 2.1 ÷ 2.4 V, go to the next step of checking, otherwise replace the sensor. Tilt the transducer 90 ° forward and repeat the above test. If the measurement result is within the range of 3.7 ÷ 4.1 V, go to the next stage of verification, otherwise replace the sensor. Tilt the transducer 90 ° back and repeat the test again. If the measurement result is within the range of 0.5 ÷ 0.9 V, go to the next stage of verification, otherwise replace the sensor. Switch off the ignition. Check the condition and tightness of the connectors on the G-sensor and the ABS module. Carry out appropriate refurbishment if necessary. If the contact connections are OK, go to the next step of the check. Reconnect the original wiring connections. Clear the processor memory and repeat the procedure for reading diagnostic codes. If there are no changes (towards improvement), replace the assembly of the ABS control module / hydromodulator. If new codes appear, go to the appropriate test. If the failure does not recur, therefore, the malfunction was temporary, check again that all contact connections are securely fastened. ABS wiring diagram
Map of the location of the contact terminals in the connector of the ABS control module The signal waveform taken from the individual terminals of the ABS sensors is shown on res. illustrations. The list of signals is given in the table. Reading Trouble Codes (DTC) ABS For a list of ABS DTCs, refer to Specifications in this Chapter. Reading DTCs Using SSM Get your SSM reader ready for use. Connect the diagnostic cable to the SSM and refill the cartridge. Connect the SSM diagnostic cable to the DLC connector located on the left under the vehicle dashboard. Turn the ignition switch to ON (do not start the engine) and power on the SSM. From the Main Menu of the Reader screen, select (Each System Check) and press the YES key. Select the (Brake Control System) subsection in the "System Selection Menu" screen, confirm the selection by pressing the YES key. After the information about the type of ABS is displayed, press the YES key again. Select (Diagnostic Code (s) Display) in the "ABS Diagnosis" field on the screen and confirm with YES. Select (Current Diagnostic Code (s)) or (History Diagnostic Code (s)) in the Diagnostic Code (s) Display, press YES. In the "Brake Control Diagnosis" screen, select (Current Data Display & Save) and confirm by pressing the YES key. From the Data Select Menu, select (Data Display) and press YES. Use the scroll buttons to move through the displayed list and select the data you are interested in. The list of output data is given in the table below.
Reading DTCs without SSM Remove the diagnostic connector located next to the driver's seat heater block. Switch off the ignition and connect the diagnostic terminal to the No. 8 terminal of the connector. Turn the ignition on, the ABS warning lamp will switch to diagnostic mode and flash the DTCs stored in the processor memory. The check start code (11) is always displayed first, then all other codes are displayed one by one, starting with the last one. After the last code is output, the cycle repeats for 3 minutes. Examples of codes output are shown in the illustration. If there are no codes stored in the memory, the control lamp will display only the start code (11). Deleting codes from processor memory Using SSM From the SSM Reader Main Menu, select (2. Each System Check) and press the YES key. In the System Select Menu, select (Brake System), press YES, wait for the ABS type to be displayed, then press YES again. Select (Clear Memory) in the "Brake Control Diagnosis" field on the screen and confirm your selection by pressing the YES key. After the messages “Done” and “Turn ignition OFF” are displayed on the reader screen, turn off the SSM power supply and turn off the ignition. Within about 12 seconds, repeat the procedure for connecting / disconnecting the terminal three times with the duration of each phase (On and Off) for at least 0.2 s. Successful completion of clearing the memory is confirmed by the indicator lamp lighting up code 11. All about curtains. Design, decoration, ideas 2022 provolp.ru | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||