Hyundai i-30: ABS (Anti-Lock Brake System) / Troubleshooting
Standard Flow of Diagnostic Troubleshooting
Notes With Regard To Diagnosis
The phenomena listed in the following table are not abnormal.
Condition
|
Explanation
|
System check sound
|
When starting the engine, a thudding sound can sometimes be heard coming
from inside the engine compartment. This is because the system operation
check is being performed.
|
ABS Operation sound
|
| 1) |
Sound of the motor inside the ABS hydraulic unit operation (whine).
|
| 2) |
Sound is generated along with vibration of the brake pedal (scraping).
|
| 3) |
When ABS operates, sound is generated from the vehicle chassis
due to repeated brake application and release (Thump : suspension;
squeak: tires)
|
|
ABS Operation (Long braking distance)
|
For road surfaces such as snow-covered and gravel roads, the braking distance
for vehicles with ABS can sometimes be longer than that for other vehicles.
Accordingly, advise the customer to drive safely on such roads by lowering
the vehicle speed.
|
Diagnosis detection conditions can vary depending on the diagnosis code.
When checking the trouble symptom after the diagnosis code has been erased,
ensure that the requirements listed in "Comment" are met.
|
ABS Check Sheet
Problem Symptoms Table
Symptom
|
Suspect Area
|
ABS does not operate.
|
Only when 1-4 are all normal and the problem is still occurring, replace
the HECU.
| 1) |
Check the DTC reconfirming that the normal code is output.
|
| 4) |
Check the hydraulic circuit for leakage.
|
|
ABS does not operate intermittently.
|
Only when 1-4 are all normal and the problem is still occurring, replace
the ABS actuator assembly.
| 1) |
Check the DTC reconfirming that the normal code is output.
|
| 2) |
Wheel speed sensor circuit.
|
| 3) |
Stop lamp switch circuit.
|
| 4) |
Check the hydraulic circuit for leakage.
|
|
Communication with diagnostic tool is not possible. (Communication with
any system is not possible)
|
|
Communication with diagnostic tool is not possible. (Communication with
ABS only is not possible)
|
|
When ignition key is turned ON (engine OFF), the ABS warning lamp does not
light up.
|
| 1) |
ABS warning lamp circuit
|
|
Even after the engine is started, the ABS warning lamp remains ON.
|
| 1) |
ABS warning lamp circuit
|
|
| •
|
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
Trouble Symptoms
|
Possible Cause
|
Brake operation varies depending on driving conditions and road surface
conditions, so diagnosis can be difficult. However if a normal DTC is displayed,
check the following probable cause. When the problem is still occurring,
replace the ABS control module.
|
| –
|
Faulty power source circuit
|
| –
|
Faulty wheel speed sensor circuit
|
| –
|
Faulty hydraulic circuit for leakage
|
|
Inspection Procedures
DTC Inspection
|
1. |
Connect the diagnostic tool with the data link connector and turn the
ignition switch ON.
|
|
2. |
Verify that the DTC code is output.
|
|
3. |
Is the DTC code output?
|
|
▶ Check
the power source circuit.
|
|
|
▶ Erase
the DTC and recheck using diagnostic tool.
|
|
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 29
of the ABS control module harness side connector and body ground.
|
Specification : approximately B+
|
|
|
3. |
Is the voltage within specification?
|
|
▶ Check
the ground circuit.
|
|
|
▶ Check
the harness or connector between the fuse (10A) in the engine compartment
junction block and the ABS control module. Repair if necessary.
|
|
Check The Ground Circuit
|
1. |
Disconnect the connector from the ABS control module.
|
|
2. |
Check for continuity between terminals 13, 38 of the ABS control module
harness side connector and ground point.
|
|
3. |
Is there continuity?
|
|
▶ Check
the wheel speed sensor circuit.
|
|
|
▶ Repair
an open in the wire and ground point.
|
|
Check The Wheel Speed Sensor Circuit
|
1. |
Refer to the DTC troubleshooting procedures.
|
|
2. |
Is it normal?
|
|
▶ Check
the hydraulic circuit for leakage.
|
|
|
▶ Repair
or replace the wheel speed sensor.
|
|
Check The Hydraulic Circuit For Leakage
|
1. |
Refer to the hydraulic lines.
|
|
2. |
Inspect leakage of the hydraulic lines.
|
|
3. |
Is it normal?
|
|
▶ The
problem is still occurring, replace the ABS control module.
|
|
|
▶ Repair
the hydraulic lines for leakage.
|
|
Detecting condition
Trouble Symptoms
|
Possible Cause
|
Brake operation varies depending on driving conditions and road surface
conditions, so diagnosis can be difficult. However if a normal DTC is displayed,
check the following probable cause. When the problem is still occurring,
replace the ABS control module.
|
| –
|
Faulty power source circuit
|
| –
|
Faulty wheel speed sensor circuit
|
| –
|
Faulty hydraulic circuit for leakage
|
|
Inspection Procedures
DTC Inspection
|
1. |
Connect the diagnostic tool with the data link connector and turn the
ignition switch ON.
|
|
2. |
Verify that the DTC code is output.
|
|
3. |
Is the DTC code output?
|
|
▶ Check
the wheel speed sensor circuit.
|
|
|
▶ Erase
the DTC and recheck using diagnostic tool.
|
|
Check The Wheel Speed Sensor Circuit
|
1. |
Refer to the DTC troubleshooting procedures.
|
|
2. |
Is it normal?
|
|
▶ Check
the stop lamp switch circuit.
|
|
|
▶ Repair
or replace the wheel speed sensor.
|
|
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 23 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.
|
|
|
▶ Repair
the stop lamp switch. Repair an open in the wire between the ABS
control module and the stop lamp switch.
|
|
Check The Hydraulic Circuit For Leakage
|
1. |
Refer to the hydraulic lines.
|
|
2. |
Inspection leakage of the hydraulic lines.
|
|
3. |
Is it normal?
|
|
▶ The
problem is still occurring, replace the ABS control module.
|
|
|
▶ Repair
the hydraulic lines for leakage.
|
|
Detecting condition
Trouble Symptoms
|
Possible Cause
|
Possible defect in the power supply system (including ground) for the diagnosis
line.
|
| –
|
Faulty power source circuit
|
|
Inspection Procedures
Check The Power Supply Circuit For The Diagnosis
|
1. |
Measure the voltage between terminal 16 of the data link connector and
body ground.
|
Specification : approximately B+
|
|
|
2. |
Is voltage within specification?
|
|
▶ Check
the ground circuit for the diagnosis.
|
|
|
▶ Repair
an open in the wire. Check and replace fuse from the engine compartment
junction block.
|
|
Check The Ground Circuit For The Diagnosis
|
1. |
Check for continuity between terminal 4 of the data link connector and
body ground.
|
|
2. |
Is there continuity?
|
|
▶ Repair
an open in the wire between terminal 4 of the data link connector
and ground point.
|
|
Detecting condition
Trouble Symptoms
|
Possible Cause
|
When communication with diagnostic tool is not possible, the cause may be
probably an open in the HECU power circuit or an open in the diagnosis output
circuit.
|
| –
|
Faulty power source circuit
|
|
Inspection Procedures
Check for Continuity in the CAN Line
|
1. |
Disconnect the connector from the ABS control module.
|
|
2. |
Check for continuity between terminals 26, 14 of the ABS control module
connector and 3, 11 of the data link connector.
|
|
3. |
Is there continuity?
|
|
▶ Check
the power source of ABS control module.
|
|
|
▶ Repair
an open in the wire.
|
|
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 29
of the ABS control module harness side connector and body ground.
|
Specification : approximately B+
|
|
|
3. |
Is voltage within specification?
|
|
▶ Check
for poor ground.
|
|
|
▶ Check
the harness or connector between the fuse (10A) in the engine compartment
junction block and the ABS control module.Repair if necessary.
|
|
Check For Poor Ground
|
1. |
Check for continuity between terminal 4 of the data link connector and
ground point.
|
|
▶ Replace
the ABS control module and recheck.
|
|
|
▶ Repair
an open in the wire or poor ground
|
|
Detecting condition
Trouble Symptoms
|
Possible Cause
|
When current flows in the HECU the ABS warning lamp turns from ON to OFF
as the initial check. Therefore if the lamp does not light up, the cause
may be an open in the lamp power supply circuit, a blown bulb, an open in
the both circuits between the ABS warning lamp and the HECU, and the faulty
HECU.
|
| –
|
Faulty ABS warning lamp bulb
|
| –
|
Blown fuse is related to ABS in the engine compartment junction
block
|
| –
|
Faulty ABS warning lamp module
|
|
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?
|
|
▶ Inspectagain
after replacing the ABS HECU.
|
|
|
▶ Check
the power source for the ABS warning lamp.
|
|
Check The Power Source For The ABS Warning Lamp
|
1. |
Disconnect the instrument cluster connector (M08) and turn the ignition
switch ON.
|
|
2. |
Measure the voltage between terminal (M08) 39 of the cluster harness
side connector and body ground.
|
Specification : approximately B+
|
|
|
3. |
Is voltage within specification?
|
|
▶ Check
the CAN circuit resistance for ABS warning lamp.
|
|
|
▶ Check
for blown fuse.
|
|
Check the CAN Circuit Resistance For ABS Warning Lamp
|
1. |
Disconnect the instrument cluster connector (M08) and turn the ignition
switch OFF.
|
|
2. |
Measure the resistance between terminal (M08) 32 and 33 of the cluster
harness side connector.
|
|
3. |
Is resistance within specification?
|
|
▶ Repair ABS warning lamp bulb or instrument cluster assembly.
|
|
|
▶ Check the CAN circuit wiring for ABS warning lamp.
|
|
Check the CAN Circuit Wiring For ABS Warning Lamp
|
1. |
Disconnect the instrument cluster connector (M08) and ABS HECU connector,
and then turn the ignition switch OFF.
|
|
2. |
Check for continuity between terminal (M08) 32 of the cluster harness
side connector and terminal 26 of ABS HECU harness side.
Check for continuity between terminal (M08) 33 of the cluster harness
side connector and terminal 14 of ABS HECU harness side.
|
|
3. |
Is resistance within specification?
|
|
▶ Repair short of wiring between terminal 26, 14 of ABS HECU harness
connector and ABS warning lamp module.
|
|
|
▶ Repair open of wiring between terminal 26, 14 of ABS HECU harness
connector and ABS warning lamp module.
|
|
Detecting condition
Trouble Symptoms
|
Possible Cause
|
If the HECU detects trouble, it lights the ABS warning lamp while at the
same time prohibiting ABS control. At this time, the HECU records a DTC
in memory. Even though the normal code is output, the ABS warning lamp remains
ON, then the cause may be probably an open or short in the ABS warning lamp
circuit.
|
| –
|
Faulty instrument cluster assembly
|
| –
|
Faulty ABS warning lamp module
|
|
Inspection Procedures
Check DTC Output
|
1. |
Connect the diagnostic tool to the 16P data link connector located behind
the driver's side kick panel.
|
|
2. |
Check the DTC output using diagnostic tool.
|
|
3. |
Is DTC output?
|
|
▶ Perform
the DTC troubleshooting procedure (Refer to DTC troubleshooting).
|
|
|
▶ Check
the CAN circuit resistance for ABS warning lamp.
|
|
Check the CAN Circuit Resistance For ABS Warning Lamp
|
1. |
Disconnect the instrument cluster connector (M08) and turn the ignition
switch OFF.
|
|
2. |
Measure the resistance between terminal (M08) 32 and 33 of the cluster
harness side connector.
|
|
3. |
Is resistance within specification?
|
|
▶ Repair
ABS warning lamp bulb or instrument cluster assembly.
|
|
|
▶ Check
the CAN circuit wiring for ABS warning lamp.
|
|
Check the CAN Circuit Wiring For ABS Warning Lamp
|
1. |
Disconnect the instrument cluster connector (M08) and ABS HECU connector,
and then turn the ignition switch OFF.
|
|
2. |
Check for continuity between terminal (M08) 32 of the cluster harness
side connector and terminal 26 of ABS HECU harness side.
Check for continuity between terminal (M08) 33 of the cluster harness
side connector and terminal 14 of ABS HECU harness side.
|
|
3. |
Is resistance within specification?
|
|
▶ Repair
short of wiring between terminal 26, 14 of ABS HECU harness connector
and ABS warning lamp module.
|
|
|
▶ Repair
open of wiring between terminal 26, 14 of ABS HECU harness connector
and ABS warning lamp module.
|
|
Inspection
ABS System Bleeding
This procedure should be followed to ensure adequate bleeding of air and filling
of the ESC unit, brake lines and master cylinder with brake fluid...
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3. Rear - right tube
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Repair procedures
ABS Control Module
