Element

Parameter

Rated value

Note

ECU (electronic

Control block)

Operating voltage, V

Working temperature, °С

10-16

40…+110

Combined ABS and EBD control unit

ABS warning lamp

Brakes (EBD)

Operating voltage, V

Consumed current, mA

Brakes: parking, brake fluid, EBD failure

HECU (hydraulic and electronic control unit)

Weight, kg

Motor power, W Pump feed, cm 3 /s Battery capacity, cm 3

Working voltage

valves NO, NC, V

180 (12 V, 30 A)

2.1 (LPA)

6 (NRA)

NO normally open,

NC normally closed,

LPA-accumulator low pressure, HPA - high pressure accumulator

contact no.

Description

State

Voltage output

AB voltage source 1. Power supply for solenoid valve

Constantly

Board system voltage

Ground connection

Always (in the ABS control unit)

Diagnostic socket contact

(K-line)

Device 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 through the switch

ignition

Ignition on

High voltage detection V: 16V

7, 11, 12, 13,14, 16, 21, 25

Not used

AB voltage source 2. Motor power supply

Constantly

Ground connection - 2 (engine)

G07

ABS relay control

EBD relay control

Stoplight switch

Rice. 7.4. Connecting the Hi-Scan device to the diagnostic socket

Phenomenon

Cause

Knocks when checking the readiness of the brake system

When starting the engine, knocks can sometimes be heard from the engine compartment. This happens when checking the operation of the system.

and is not considered abnormal.

Sound during ABS operation

1. From the engine inside the ABS hydraulic unit when running (howling)

2. Appears along with vibration of the brake pedal (scraping sound)

3. When ABS is working, the sound comes from the car chassis due to the cycling 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, such roads should be driven at a reduced speed and very carefully.

Code

malfunctions on the Hi+Scan

Faulty

elements

Cause

malfunctions

Conditions

definitions

C2 402

Engine relay. Engine (ECU, wiring harness)

Short circuit of the engine to the battery

Break in the engine circuit

The controller starts monitoring the motor after 1.8s from when the motor relay turns off if the motor voltage is above the criterion for 200ms

The controller starts monitoring the motor after 1.8 s

starting from the moment the motor relay turns off, if the motor voltage is above 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 9.6 V, then the control returns to the normal state

3. When the ignition voltage is less than 7.2V, is detected in state 1

4. If the voltage increases more than 7.5V, the controller returns to state 1

C1 101

overvoltage

1. When the ignition voltage is more than 16V for 500ms

or more than 18 V for 49 ms

2. If the voltage returns to the normal range, the controller resets

C1 604

EEPROM memory failure

ECU malfunction

After the main processor writes the predetermined data to the EEPROM, reads the data, compares with each other, and determines that they are different from each other

If the main/slave processor detects abnormal RAM memory, register status, timer interrupts,

AC to DC converter and cycle time

FL (front left wheel) -

C1 202, FR (front right wheel) - C1 205, RL (rear left

wheel) - C1 208, RR (rear

right wheel) - С1 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, wiring harness)

chain break

Short circuit

valve out of range and it continues

within 56 ms

When the valve relay turns on, the relay reference voltage

valve is higher than required and this continues for 56 ms

C1 604

Solenoid valve (ECU, wiring harness)

Open circuit, short circuit, current

leaks

1. When the valve relay de-energizes, the reverse voltage of the transistor (MOSFET) driving the solenoid is higher than required and this continues for 56 ms

2. When the valve relay turns on and the solenoid turns off, the reverse voltage of the transistor (MOSFET) driving the solenoid is lower than required and this continues for 56 ms

3. When the valve relay and solenoid are turned on, the reverse

solenoid drive transistor (MOSFET) voltage is higher than required and this continues for 56 ms

C2 402

Engine relay. Engine

(ECU, wiring harness)

Engine relay or fuse, break, engine short to ground

Engine lock

When the motor relay turns on, the motor reference voltage is lower than required and this continues for 49 ms

The controller starts to monitor the motor voltage

within 84 ms from when the motor relay turns off. If the motor voltage is below the required voltage for 49 ms after 1.8 s from the moment the motor was switched off, the motor is switched on again for 1 s and the specified test is repeated again. At the second check, when the motor voltage is lower than required for 49 ms, the controller recognizes the fault

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 the battery; chain break

The wheel speed is less than 7 km/h, the sensor bias voltage is out of range (2.15-3.5 V), if it is co; standing continues for 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 compare 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 control 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 other wheels exceeds 10 km/h with an acceleration greater than 0.4 g, the controller starts to compare 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

Faulty active element

1. The maximum wheel speed exceeds 20km/h, the wheel speed is 40% of the maximum wheel speed. If this condition continues for 1 min

2. The maximum wheel speed exceeds 40km/h, the wheel speed is 60% of the maximum wheel speed. If this condition continues for 30 s

Front

left

wheel

Front

right

wheel

rear

left

wheel

rear

right

wheel

WARNING

Remove the double protection of the connectors and insert the meter probe into the connector from the side of the wiring harness (rear). When installing the probe on the contact side, it is difficult to ensure a reliable connection.

3. Disconnect the HECU and motor connector.

Installation

1. Installation is carried out in the reverse order of removal.

2. Tighten the modulator mounting bolts and the brake pipe nuts to the prescribed torques.

Tightening torques:

- HECU mounting bolt - 8–10 Nm;

– a nut of fastening of a brake tube – 13–17 N·m.

Wheel speed sensors

Withdrawal

1. Turn out a bolt of fastening of the sensor of speed of a forward wheel and after disconnection of a contact socket remove the sensor ( rice. 7.7).

2. Remove the rear seat cushion.

3. Remove finishing of a back rack.

4. Remove the rear wheel.

5. Turn out a bolt of fastening of the gauge of speed of a back wheel and after disconnection of a contact socket remove the gauge ( rice. 7.8).

Examination

1. Connect an ohmmeter between the wheel speed sensor terminals and measure the resistance.

Rated resistance:

- front wheel sensor - 1275-1495 Ohm;

- rear wheel sensor - 1275–1495 ohms.

2. With the wheel speed sensor installed on the vehicle, connect a voltmeter to the sensor connector pins and, by turning the wheel, measure the voltage.

ABS (ABS)

Before driving after parking, make sure that the parking brake is released and that the brake system warning light is off.

After driving through water or washing the car, the brakes may get wet. Wet brakes are very dangerous as the car will not be able to stop quickly. To dry out the brakes, apply light pressure while the vehicle is moving until braking becomes normal, being careful not to lose control of the vehicle.

Do not roll downhill in neutral. Always keep a gear engaged while the vehicle is moving, apply the brakes to slow the vehicle down, then downshift so that engine braking helps maintain a safe speed.

Avoid driving style with frequent hard braking. Do not keep your left foot on the brake pedal all the time while riding, this can be dangerous as it will cause the brakes to overheat and lose their effectiveness. This also leads to increased wear of the brake system parts. If a tire punctures while driving, depress the brake pedal lightly and try to keep the vehicle straight while decelerating. When you slow down sufficiently, pull off the road and come to a complete stop in a safe place. If your vehicle is equipped with an automatic transmission, do not allow the vehicle to move slowly forward. To do this, when the car is stopped, keep your foot on the brake pedal.

Take precautions when parking on a slope. Engage the parking brake and move the selector to the "P" position (automatic transmission) or the gear lever to the neutral position (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 if you need to prevent the vehicle from rolling for other reasons, block the wheels.

Under certain conditions, your parking brake may freeze in the applied 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 "P" (automatic transmission) or the shift lever to the first gear or reverse gear to block the wheels car. Then release the parking brake.

Do not hold the vehicle on a slope with the accelerator pedal. This may cause the transmission to overheat. Always use the brake pedal or parking brake.

ANTI-LOCK BRAKES

The Anti-Lock Braking System (ABS) prevents the wheels from locking up during heavy braking or when driving on rough roads. The anti-lock braking system (ABS) electronic control unit monitors the vehicle's wheel speed and regulates the brake fluid pressure in each working brake cylinder. Thus, in emergency situations or on a smooth road, this system improves the vehicle's handling during braking.

During operation of the anti-lock braking system (ABS), a slight pulsation may be felt on the brake pedal when braking. Also, while the car is moving, you can hear noise in the engine compartment. These phenomena are normal and indicate that the anti-lock braking system (ABS) is working properly.
The anti-lock braking system (ABS) will not be able to prevent traffic accidents due to incorrect or dangerous maneuvering. While it does help improve vehicle handling during emergency braking, always maintain a safe distance from the vehicle in front. Vehicle speed must be reduced in adverse driving conditions.
In the cases listed below, the stopping distance of vehicles with anti-lock braking system (ABS) may be longer than that of vehicles without it:

– when driving on gravel roads and roads covered with snow;
– when driving with snow chains fitted;
– when driving on roads with bumps, potholes, etc., on bumpy roads or other poorly paved roads.

The speed of traffic on such roads should be reduced. Do not test the safety of a vehicle equipped with an anti-lock braking system (ABS) by cornering or driving at high speeds as this could be dangerous to you or others.

A faulty ABS system does not disable the vehicle's braking system. But every driver who has driven a Hyundai Accent with a safety light on knows how difficult it becomes to drive in such conditions.

Pulling with the repair of the abs unit is dangerous

The braking distance is lengthened, the brake pedal "gets stiff", it is not possible to quickly respond to the neighbor's maneuver. This is how emergencies happen. Therefore, the company "Autopilot" recommends that Hyundai Accent ABS be repaired in a timely manner. In the service center of Moscow, they are well aware of all the "diseases" of this block, which are characteristic of this model at 3-4 years of age. Most often, this is a clogging 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. Often helps bulkhead motor - it will be cheaper. But it should be done by professionals: the elements of the module are located in a hard-to-reach place, therefore, it is necessary to repair the ABS on the Hyundai Accent at special sites with the appropriate equipment at hand.

Prices do not "bite" everywhere

The Autopilot service center has its own warehouse of parts - original and non-original, at the choice of the driver. So you don’t have to worry about crazy costs, even if the entire block has to be replaced due to corrosion and deposits. If desired, the client can himself be present in the repair area. These specialists are well versed in assembling Hyundai of all models and are always ready to show how it should be done correctly. In addition to replacing or restoring the ABS system, the Hyundai Autopilot center 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 ABS failures

ABS failures of the driver are signaled by a special control lamp located on the dashboard of the car. As soon as the ABS control module detects a violation in the system, it turns it off. The braking system continues to function normally.

Diagnostics of the ABS condition is performed every time the engine is started and is accompanied by a short-term operation of the control lamp. Within a short time after starting, the lama should automatically turn off.

If the ABS warning light comes on and stays on while driving, first make sure the parking brake is fully released and the brake system is working properly. If everything is normal, then the ABS has failed. Do the following simple checks first:

a) Check the condition of the brake calipers and wheel cylinders;
b) Check up a condition and reliability of fastening of contact sockets of electroconducting of the control module ABS and wheel gauges (see the Head Onboard electrical equipment);
c) Check the appropriate fuses (see Chapter Onboard electrical equipment).

Failures of a control lamp ABS

The reason for failures in the operation of the ABS warning lamp may be an open or short circuit in its electrical wiring circuit.

The ABS warning lamp does not come on when the ignition is switched on


Try to turn on the ignition without starting the engine - if the other indicator lamps that are part of the instrument cluster work properly, proceed to the next step of the test, otherwise the necessary restorative device of the instrument panel should be made.

Switch off the ignition. Remove the instrument cluster, remove the ABS warning lamp and check its condition. If the lamp is burned out, replace it, otherwise proceed to the next step of the test.

Disconnect the contact pair B62 / F45 and measure the voltage between the chassis ground (-) and terminal No. G6 (+) of the B62 connector. If the measurement result is less than 3 V, proceed to the next test step, otherwise, check the condition of the wiring of the corresponding control lamp. Make necessary repairs.

Turn off the ignition, put the control 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 does not fall outside the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring. Make necessary repairs.

Switch off the ignition and perform a voltage test between terminal G6 (+) of connector F45 and chassis ground. If the measurement result is less than 3 V, proceed to the next test step, otherwise check the condition of the relevant wiring. Make necessary repairs.

Switch on the ignition and repeat the test. If the measurement result is less than 3 V, proceed to the next test step, otherwise, check the condition of the wiring of the corresponding control lamp. Make necessary repairs.

Measure the resistance between terminal No. 23 of connector F49 and ground. If the measurement result is less than 5 ohms, proceed to the next step of the test, otherwise, check the grounding of the control module / hydromodulator assembly. Make necessary repairs.

Measure the resistance between ground and terminal G6 connector F45. If the measurement result is less than 5 ohms, proceed to the next test step, otherwise check the condition of the connector and its wiring harness. Make the necessary remedial repairs, if necessary, replace the connector.

Turn off the ignition and check the condition of the connectors in the circuit section between the instrument cluster and the ABS control module, - if there are no signs of poor contact reliability, replace the ABS control module / hydraulic modulator assembly.

The ABS warning lamp does not turn off after starting the engine


Switch off the ignition and make sure that the connector of the ABS control module / hydraulic modulator is fully seated and securely fixed.

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, proceed to the next step of the test, otherwise, check the condition of the corresponding wiring harness, make the necessary remedial repairs.

Switch off the ignition and connect the diagnostic terminal to terminal No. 8 of the B82 diagnostic connector. Disconnect the ABS control module connector and measure the resistance between connector F49 terminal No. 4 and chassis ground. If the measurement result is less than 5 ohms, proceed to the next step of the test, otherwise check the condition of the wiring in the circuit section between the ABS control module and the diagnostic connector, make the necessary remedial repairs.

Run the engine to idle and check for voltage between the B (+) terminal on the back of the generator (power terminal) and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise replace/repair the generator (see Chapter ) and repeat the test.

Turn off the ignition and check the condition of the battery terminals and the reliability of the terminal lugs of the wires on them. Make the necessary corrections if necessary.

Disconnect the ABS control module wiring connector, then start the engine at idle and measure the voltage between terminal No. 1 (+) of connector F49 and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring of the power supply circuit. Make necessary repairs.

Disconnect the contact pair B62 / F45 and turn on the ignition - if the ABS warning lamp does not work, proceed to the next step of the test, otherwise check the condition of the front wiring harness.

Switch off the ignition and check the condition of the tabs on the control module connector. If the terminals are in order, proceed to the next step of the test, otherwise, replace the control module / hydromodulator (see Section ).

Measure the resistance between terminals No. 22 and 23 of the ABS control module connector. If the measurement result is more than 1 MΩ, proceed to the next step of the test, otherwise replace the ABS control module/hydraulic modulator assembly (see Section Removal, installation and check of serviceability of functioning of assembly of the control module / hydraulic modulator ABS).

Measure the resistance between terminal G6 of connector F45 and chassis ground. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, make the necessary reconditioning of the wiring.

Connect the wiring 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 MΩ, proceed to the next step of the test, otherwise, make the necessary reconditioning of the wiring.

Check the condition and security of the ABS control module connector. If necessary, make the necessary corrections, or replace the control module / hydromodulator assembly.

Unable to read fault codes

If the test lamp turns on and off normally, but does not display the initial code (DTC 11 - see below) when entering the diagnostic mode, turn off the ignition and perform the checks.

Wheel sensor failures

Failures of wheel sensors lead to violation of serviceability of functioning of ABS. The connection diagram of the wheel sensors is shown in the illustration.

Disconnect the wiring from the ABS control module and measure the voltage between the appropriate wheel sensor terminal No. 1 and chassis ground. If the measurement result is less than 1 V, proceed to the next test step, otherwise replace the sensor.

Switch on the ignition and repeat the previous test. If the measurement result is less than 1 V, proceed to the next test step, otherwise replace the sensor.

Turn off the ignition and connect the wiring to the sensor. Measure the resistance between terminals Nos. 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, proceed to the next step of the test, otherwise check the condition of the wiring in the area between the control module and the sensor. Make necessary repairs.

Measure the voltage between ground and terminal No. 11 (DTC 21)/9 (DTC 23)/14 (DTC 25)/7 (DTC 27) of connector F49. If the measurement is greater than 1 V, repair the short in the 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), proceed to the next step of the test, 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 gap between the sensor and the rotor around the entire perimeter of the latter. In case of insufficient clearance (see. Specifications) adjust it by selecting an adjusting shim (26755АА000). If the gap is too large, remove the spacers and replace the rotor (assembly with swivel assembly) or failed sensor. After completing the adjustment, proceed to the next step of the test.

Ignition OFF, and measure the resistance between the wheel sensor connector terminal #1 and chassis ground. If the measurement result is more than 1 MΩ, proceed to the next test step, otherwise replace the sensor.

Switch off the ignition and connect the wiring 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) of connector F49. If the measurement result is more than 1 MΩ, proceed to the next step of the test, otherwise check the condition of the wiring in the section of the circuit between the sensor and the ABS control module. Make necessary repairs. If the wiring is OK, replace the control/hydraulic modulator assembly.

Restore the original connection of all connectors, clear the processor memory (see below) and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. If new codes appear, proceed to perform the appropriate check. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Short in wheel sensor circuit (DTC #22, 24, 26 & 28)

Switch off the ignition and check the tightness of the sensor mounting bolts (32 Nm). Tighten the fasteners if necessary and proceed to the next step of the test.

If you cannot use an oscilloscope, move on 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 jack stands so that the wheels are completely off the ground. Turn off the ignition and connect an oscilloscope between terminals No. 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, while rotating the corresponding wheel of the car, follow the oscilloscope readings. The amplitude of the sinusoidal signal displayed on the screen should not go beyond the range of 0.12 ÷ 1.00 V, - if this condition is not met, or the signal has an irregular shape, proceed to the next step of the test.

Check wheel hub runout. If the measurement result is less than 0.05 mm, proceed to the next step of the test, otherwise replace the hub.

Switch off the ignition. Disconnect the wiring from the appropriate wheel sensor. Measure the resistance between terminals No. 1 and 2 of the sensor connector. If the measurement result is within the range of 1 ÷ 1.5 kOhm, proceed to the next step of the test, otherwise replace the sensor.

Measure the resistance between ground and terminal No. 1 of the wheel sensor connector. If the measurement result is more than 1 MΩ, proceed to the next test step, 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 Nos. 11 and 12 (DTC 22)/9 and 10 (DTC 24)/14 and 15 (DTC 26)/7 and 8 (DTC 28) of connector F49 of the ABS control module. If the measurement result is within the range of 1 ÷ 1.5 kOhm, proceed to the next step of the test, otherwise, perform the necessary reconditioning of the wiring in the section of the circuit between the sensor and the control module / ABS hydromodulator.

Measure the resistance between chassis ground and terminal No. 11 (DTC 22)/9 (DTC 24)/14 (DTC 26)/7 (DTC 28) of connector F49 of the control module. If the measurement result is more than 1 MΩ, proceed to the next step of the test, otherwise check the wiring between the sensor and the module for a short circuit. Make necessary repairs.

Measure the resistance between ground and terminal No. 23 of connector F49. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, eliminate the cause of the ground fault.

Check up reliability of fastening of contact sockets of the module of management ABS and the wheel gauge. Make the necessary corrections. If the contacts are in order, proceed to the next step of the test.

Make sure the car phone/remote control transmitter is installed at a sufficient distance from the wheel sensor wiring harness.

Restore the original connection of all connectors and measure the resistance between ground and terminal No. A5 (DTC 22) / A6 (DTC 24) of connector B62. If the measurement result is less than 0.5 ohm, proceed to the next test step, otherwise replace the shielded harness.

Restore the original connection of all connectors and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

There are problems with the correct output of the wheel sensor (one or all four) of the information signal (DTC 29)


Assess the condition of the tread and tire inflation pressure. Make appropriate corrections/replacements if necessary.

Check up reliability of a tightening of bolts of fastening of sensors ABS (32 Nm). Tighten the fasteners if necessary and proceed to the next step of the test.

Measure the gap between the sensor and the rotor around the entire perimeter of the latter. In case of 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 (assembly with swivel assembly) or failed sensor. After completing the adjustment, proceed to the next step of the test.

If you cannot use an oscilloscope, move on 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 jack stands so that the wheels are completely off the ground. Turn off the ignition and connect an oscilloscope between terminals No. 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, while rotating the corresponding wheel of the car, follow 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, proceed to the next test stage, otherwise proceed to the next test.

Carefully inspect the wheel sensor and its rotor for signs of damage or contamination. Wipe components, fix any problems.

Check wheel hub runout. If the measurement result is less than 0.05 mm, proceed to the next step of the test, otherwise replace the hub.

Switch off the ignition. Restore the original wiring connection. Clear the processor memory (see below) and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, check again the reliability of fastening of all contact connections.

Failures of the control module / hydraulic modulator ABS


Intake (DTC 31, 33, 35 & 37) / Exhaust (DTC 32, 34, 36 & 38) Solenoid Valve Malfunction

Disconnect the wiring from the ABS control module.

Start the engine at idle and measure the voltage between terminal No. 1 (+) of connector F49 of the control unit and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring between the battery, the ignition switch and the ABS control module. Make necessary repairs.

Switch off the ignition and measure the resistance between chassis ground and terminal No. 23 of connector F49. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, eliminate the cause of the ground fault.

ABS Control Module Malfunction (DTC 41)

Switch off the ignition. Disconnect the wiring from the ABS control module and measure the resistance between terminal No. 23 of connector F49 and chassis ground. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, eliminate the cause of the ground fault.

Check up serviceability of a condition and reliability of fixing of contact sockets of electroconducting on the control module ABS, the generator and the storage battery. Carry out appropriate reconditioning if necessary. If there are no violations of the quality of contacts, proceed to the next step of the test.

Make sure the car phone/remote control transmitter is installed at a sufficient distance from the ABS wiring harnesses.

Switch off the ignition. Restore the original wiring connection. Clear the processor memory and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Deviation from the nominal supply voltage level (DTC 42)

Start the engine and warm it up to normal operating temperature. Check that the idle speed is set correctly. Measure the voltage between the B (+) terminal on the rear of the generator and chassis ground. If the measurement result does not fall outside the range of 10 ÷ 17 V, proceed to the next step of the test, otherwise check the state of the charging system (see Chapter Engine electrical equipment ), make the necessary corrections.

Turn off the ignition and check the condition of the battery terminals 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, start the engine at idle and measure the voltage between ground and terminal No. 1 (+) of the F49 connector. If the measurement result is within the range of 10 ÷ 17 V, proceed to the next step of the test, otherwise check the condition of the wiring between the ignition switch and the ABS control module connector. Make necessary repairs.

Switch off the ignition and measure the resistance between terminal No. 23 of connector F49 and chassis ground. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, eliminate the cause of the ground fault.

Check up serviceability of a condition and reliability of fixing of contact sockets of electroconducting on the control module ABS, the generator and the storage battery. Carry out appropriate reconditioning if necessary. If there are no violations of the quality of contacts, proceed to the next step of the test.

Switch off the ignition. Restore the original wiring connection. Clear the processor memory and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Violation of serviceability of functioning of a control system АТ (DTC 44)

Ignition OFF, and disconnect the two transmission control module (TCM) harness connectors. Also disconnect the electrical wiring from the ABS control module. Measure the resistance between terminal No. 3 of connector F49 and chassis ground. If the measurement is greater than 1 MΩ, proceed to the next step of the test, otherwise, recondition the wiring between the TCM and the ABS control module.

Switch on the ignition and measure the voltage between ground and terminal No. 3 of connector F49. If the measurement is less than 1V, proceed to the next test step, otherwise, perform the necessary reconditioning of the wiring in the area between the TCM and the ABS control module.

Measure the voltage between ground and terminals No. 3 and 31 of connector F49. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring in the area between the ABS control module and the TCM. Make necessary repairs.

Check up a condition and reliability of fixing of contact sockets of modules of management ABS and АТ. If necessary, clean the terminals and proceed to the next step of the test.

Switch off the ignition. Restore the original wiring connection. Clear the processor memory and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Valve Relay Malfunction (DTC 51)

Switch off the ignition and disconnect the electrical wiring from the ABS control unit. Start the engine at idle and measure the voltage between terminals No. 1 and 24 of connector F49 of the ABS control module and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring between the ABS control unit and the battery. Make necessary repairs.

Measure the resistance between terminals No. 23 (+) and 24 (-) of the control module connector. If the measurement result is more than 1 MΩ, proceed to the next step of the test, otherwise replace the control unit.

Check up serviceability of a condition and reliability of fixing of contact sockets of electroconducting on the control module ABS, the generator and the storage battery. Carry out appropriate reconditioning if necessary. If there is no violation of the quality of contacts, proceed to the next step of the test.

Switch off the ignition. Restore the original wiring connection. Clear the processor memory and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Malfunction of the drive motor / its relay (DTC 52)

Switch off the ignition. Disconnect the wiring from the ABS control module, then turn the ignition key back to the ON position and measure the voltage between the control module connector F49 terminal No. 25 and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise, recondition the wiring in the area between the battery and the control module / hydromodulator. Check the SBF fuse holder.

Switch off the ignition and measure the resistance between ground and terminal No. 26 of connector F49. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, repair the ground circuit of the control unit.

Start the engine at idle and measure the voltage between terminal No. 1 of connector F49 and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring in the areas between the battery, the ignition switch and the ABS control module. Make necessary repairs.

Switch off the ignition and measure the resistance between ground and terminal No. 23 of connector F49. If the measurement result is less than 0.5 ohm, proceed to the next step of the test, otherwise, eliminate the cause of the ground fault.

In the course of checking the sequence of operation of the hydraulic modulator valves (see Section Checking the sequence of operation of the ABS hydraulic modulator valves) by ear, check the correct operation of the electric motor. If the motor rotates properly, proceed to the next step of the test, otherwise replace the ABS modulator/control unit assembly.

Check the serviceability of the condition and the reliability of the fixation of the electrical wiring connectors on the assembly of the ABS control module / hydraulic modulator, generator and battery. Carry out appropriate reconditioning if necessary. If there are no violations of the quality of contacts, proceed to the next step of the test.

Switch off the ignition. Restore the original wiring connection. Clear the processor memory and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Violation of serviceability of functioning of the gauge-switch of stoplights (DTC 54)

Failure of the sensor-switch of brake lights leads to a malfunction of the ABS.

Check the brake lights for proper operation when the foot brake pedal is depressed. If everything is in order, proceed to the next step of the test, otherwise check the condition of the lamps and wiring of the brake light circuit.

Switch off the ignition. Disconnect the wiring from the ABS control module. Depress the foot brake pedal and measure the voltage between ABS control module connector F49 terminal No. 2 and chassis ground. If the measurement result is within the range of 10 ÷ 15 V, proceed to the next step of the test, otherwise check the condition of the wiring in the area between the brake light sensor-switch and the ABS control module. Make necessary repairs.

Check the condition and reliability of the fixation of the contact connectors of the sensor-switch and the control unit. Make appropriate corrections if necessary. If the contacts are in order, proceed to the next step of the test.

G-Sensor Output Malfunction (DTC 56)


Check the marking of the assembly of the ABS control module / hydraulic modulator, - the code is applied on the surface of the block between the fittings for connecting the hydraulic lines and for models (see Specifications). If the marking corresponds to the configuration of your car, proceed to the next step of the test, otherwise replace the ABS control module / hydraulic modulator assembly.

Disconnect the electrical wiring from the G-sensor. Measure the resistance between terminal No. 6 of connector F49 and chassis ground. If the measurement result is more than 1 MΩ, proceed to the next step of the test, otherwise, make the necessary reconditioning of the wiring in the area between the sensor and the ABS control module.

Measure the voltage between terminal No. 6 of connector F49 and chassis ground. If the measurement result is less than 1 V, proceed to the next step of the test, otherwise, make the necessary reconditioning of 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, proceed to the next step of the test, otherwise, make the necessary reconditioning of the wiring in the area between the sensor and the ABS module.

Measure the resistance between ground and terminal No. 28 of connector F49. If the measurement result is more than 1 MΩ, proceed to the next step of the test, otherwise, make the necessary reconditioning of the wiring in the area between the sensor and the ABS control module. If wiring is OK, replace control module/hydraulic modulator assembly.

Turn off the ignition and, without disconnecting the wiring, unbolt the G-sensor. Check up reliability of fixing of contact sockets of the sensor and control module ABS. Turn on the ignition and measure the voltage between terminals No. 2 (+) and No. 3 (-) of the sensor connector R70. If the measurement result is within the range of 2.1 ÷ 2.4 V, proceed to the next step of the test, 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, proceed to the next step of the test, otherwise replace the sensor.

Tilt the transducer 90° backwards and repeat the test again. If the measurement result is within the range of 0.5 ÷ 0.9 V, proceed to the next step of the test, otherwise replace the sensor.

Switch off the ignition. Check up a condition and reliability of fixing of contact sockets of the G-sensor and module ABS. Carry out appropriate reconditioning if necessary. If the contact connections are in order, proceed to the next step of the test.

Restore the original wiring connection. Clear the processor memory and repeat the procedure for reading diagnostic codes. If no change (in the direction of improvement) has occurred, replace the ABS control module/hydraulic modulator assembly. When new codes appear, go to the appropriate test. If the failure did not repeat, therefore, the malfunction was temporary, - once again make sure that all contact connections are securely fastened.

Checking the I/O Signals of the ABS Control Module

The map of the location of the contact terminals in the connector of the control module / hydraulic modulator and the wiring diagram of the ABS components are shown in the illustrations.

ABS Wiring Diagram

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's instrument panel.

Turn the ignition key to the ON position (do not start the engine) and power on the SSM.

In the Main Menu of the reader screen, select the section (Each System Check) and press the YES key.

In the "System Selection Menu" field of the screen, select the subsection (Brake Control System), confirm the selection by pressing the YES key.

After displaying the ABS type information, press the YES key again.

In the "ABS Diagnosis" field of the screen, select the item (Diagnostic Code(s) Display) and confirm the selection by pressing the YES key.

Select (Current Diagnostic Code(s)) or (History Diagnostic Code(s)) in the "Diagnostic Code(s) Display" field of the screen, press the YES key.

Reading current data

Enter the menu subsection (Brake Control System), wait for the ABS type message to appear on the screen and press the YES key.

In the "Brake Control Diagnosis" field of the screen, select the item (Current Data Display & Save) and confirm the selection by pressing the YES key.

In the Data Select Menu field, select (Data Display) and press YES.

Use the scroll buttons to move through the list displayed on the screen and select the data you are interested in. The list of output data is given in the table below.

Turn off the ignition and connect the diagnostic terminal to terminal No. 8 of the connector.

Turn the ignition on, the ABS warning lamp will go into diagnostic mode and start flashing the fault codes (DTCs) stored in the processor memory.

The test start code (11) is always displayed first, then all other codes are output in turn, starting with the last one. After the last code is displayed, the cycle repeats for 3 minutes. Examples of code 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).

In the System Select Menu, select (Brake System), press YES, wait until the ABS type information is displayed, then press YES again.

In the "Brake Control Diagnosis" field of the screen, select the item (Clear Memory) and confirm the selection by pressing the YES key.

After the reader displays the messages “Done” and “Turn ignition OFF”, power off the SSM and turn off the ignition.

Without SSM

Within approximately 12 seconds, repeat the procedure for connecting / disconnecting the terminal three times with the duration of each phase (On and Off) of at least 0.2 s.

Successful completion of the memory clearing is confirmed by the flashing of code 11 by the control lamp.

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