ABS (Anti-Lock Brake System)

Standard Flow of Diagnostic Troubleshooting

Notes With Regard to Diagnosis
The phenomena listed in the following table are not abnormal.

Scan Tool Check
1. Turn the ignition switch OFF.
2. Connector the Scan tool to the 16P data link connector located the driver's side kick panel.

3. Turn the ignition switch ON.
4. Check for DTC using the Scan tool
5. After completion trouble of the repair or correction of the problem, erase the stored fault codes using the scan tool.
6. Disconnect the Scan tool from the 16P data link connector.

ABS Check Sheet

Problem Symptoms Table

CAUTION:
During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent the wheels from locking and is not an abnormality.

Detecting Condition

Inspection Procedures
DTC Inspection
1. Connect the Scan Tool with the data link connector and turn the ignition switch ON.
2. Verify that the system is operating to specifications.
3. Is the system operating to specifications?

Check the Power Source Circuit
1. Disconnect the connector from the ABS control module.
2. Turn the ignition switch ON, measure the voltage between terminal 18 of the ABS control module harness side connector and body ground.

Specification:approximately B+

3. Is the voltage within specification?

Check the Ground Circuit
1. Disconnect the connector from the ABS control module.
2. Check for continuity between terminals 1,4 of the ABS control module harness side connector and ground point.
3. Is there continuity?

Check the Wheel Speed Sensor Circuit
1. Refer to the DTC troubleshooting procedures.
2. Is the system operating to specifications?

Check the Hydraulic Circuit for Leakage
1. Refer to the hydraulic lines.
2. Inspect leakage of the hydraulic lines.
3. Is the system operating to specifications?

Detecting Condition

Check the Wheel Speed Sensor Circuit
1. Refer to the DTC troubleshooting procedures.
2. Is the system operating to specifications?

Check the Stop Lamp Switch Circuit
1. Check that stop lamp lights up when brake pedal is depressed and turns off when brake pedal is released.
2. Measure the voltage between terminal 20 of the ABS control module harness side connector and body ground when brake pedal is depressed.

Specification :approximately B+

3. Is the voltage within specification?

Check the Hydraulic Circuit for Leakage
1. Refer to the hydraulic lines.
2. Inspection leakage of the hydraulic lines.
3. Is the system operating to specifications?

Detecting Condition

Inspection Procedures
Check the Power Supply Circuit for the Diagnosis
1. Measure the voltage between terminal 9 of the data link connector and body ground.

Specification :approximately B+

2. Is voltage within specification?

Check the Ground Circuit for the Diagnosis
1. > Repair an open in the wire. Check and replace fuse (15A) from the engine compartment junction block.
2. Is there continuity?

Detecting Condition

Inspection Procedures
Check for Continuity in the Diagnosis Line
1. Disconnect the connector from the ABS control module.
2. Check for continuity between terminals 11 of the ABS control module connector and 1 of the data link connector.
3. Is there continuity?

Check the Power Source of ABS Control Module
1. Disconnect the connector from the ABS control module.
2. Turn the ignition switch ON, measure the voltage between terminal 18 of the ABS control module harness side connector and body ground.

Specification :approximately B+

3. Is voltage within specification?

Check for Poor Ground
1. Check for continuity between terminal 5 of the data link connector and ground point.

Detecting Condition

Inspection Procedures
Problem Verification
1. Disconnect the connector from the ABS control module and turn the ignition switch ON.
2. Does the ABS warning lamp light up?

Check the Power Source for the ABS Warning Lamp
1. Disconnect the instrument cluster connector(M01-C) and turn the ignition switch ON.
2. Measure the voltage between terminal 16 of the cluster harness side connector(M01-C) and body ground.

Specification :approximately B+

3. Is voltage within specification?

Check for Blown Fuse
1. Check continuity of fuse (10A) from the engine compartment junction block.
2. Is there continuity?

Detecting Condition

Inspection Procedures
Check DTC Output
1. Connect the Scan Tool to the 16P data link connector located behind the driver's side kick panel.
2. Check the DTC output using Scan Tool.
3. Is DTC output?

Check Instrument Cluster
1. Disconnect the cluster connector and turn the ignition switch ON.
2. Does the ABS warning lamp remains ON?

Check for Open In The Wire
1. Check for continuity in the wire between cluster and ABS control module.
2. Is there continuity?

Bleeding of Brake System
This procedure should be followed to ensure adequate bleeding of air and filling of the ABS unit, brake lines and master cylinder with brake fluid.
1. Remove the reservoir cap and fill the brake reservoir with brake fluid.

CAUTION:
If there is any brake fluid on any painted surface, wash it off immediately.

NOTE:
When pressure bleeding, do not depress the brake pedal.
Recommended fluid. DOT3 or DOT4

2. Connect a clear plastic tube to the brake caliper bleeder plug and insert the other end of the tube into a half filled clear plastic bottle.
3. Connect the scan tool to the data link connector located underneath the dash panel.
4. Select and operate according to the instructions on the scan tool screen.

CAUTION:
You must obey the maximum operating time of the ABS motor with the scan tool to prevent the motor pump from burning.

(1) Select Hyundai vehicle diagnosis.
(2) Select vehicle name.
(3) Select Anti-Lock Brake system.
(4) Select air bleeding mode.
(5) Press "YES" to operate motor pump and solenoid valve.

(6) Wait 60 sec. before operating the air bleeding again.
(If not, you may damage the motor.)

5. Pump the brake pedal several times, and then loosen the bleeder screw until fluid starts to run out without bubbles. Then close the bleeder screw.
6. Repeat step 5 until there are no more bubbles in the fluid for each wheel.

7. Tighten the bleeder screw.

Bleed screw tightening torque:
6.9 - 12.7N.m (0.7 - 1.3kgf.m, 5.1 - 9.4lb-ft)