Hyundai Azera: Troubleshooting
| Failure Diagnosis |
| 1. |
In principle, ESC and TCS controls are prohibited in case of ABS failure. |
| 2. |
When ESC or TCS fails, only the failed system control is prohibited. |
| 3. |
However, when the solenoid valve relay should be turned off in case of ESC failure, refer to the ABS fail-safe. |
| 4. |
Information on ABS fail-safe is identical to the fail-safe in systems where ESC is not installed.
|
Memory of Fail Code
| 1. |
It keeps the code as far as the backup lamp power is connected. (O) |
| 2. |
It keeps the code as far as the HCU power is on. (X)
|
Failure Checkup
| 1. |
Initial checkup is performed immediately after the HECU power on. |
| 2. |
Valve relay checkup is performed immediately after the IG2 ON. |
| 3. |
It executes the checkup all the time while the IG2 power is on.
|
Countermeasures in Fail
| 1. |
Turn the system down and perform the following actions and wait for HECU power OFF. |
| 2. |
Turn the valve relay off. |
| 3. |
Stop the control during the operation and do not execute any until the normal condition recovers.
|
Warning Lamp ON
| 1. |
ESC warning lamp turn on for 3sec after IGN ON. |
| 2. |
ESC function lamp blinks when ESC Act. |
| 3. |
If ESC fail occured, ESC warning turns ON. |
| 4. |
ESC OFF lamp turn on in case of
|
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 |
| ||||
| 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.
| ||||||
| ABS does not operate intermittently. | Only when 1~4 are all normal and the problem is still occurring, replace the ABS actuator assembly.
| ||||||
| Communication with GDS is not possible. (Communication with any system is not possible) |
| ||||||
| Communication with GDS 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. |
| ||||||
| Even after the engine is started, the ABS warning lamp remains ON. |
| ||||||
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 ESC control module. |
| ||||||
Inspection procedures
DTC Inspection
| 1. |
Connect the GDS 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
| 1. |
Disconnect the connector from the ESC control module. |
| 2. |
Turn the ignition switch ON, measure the voltage between
terminal 29 of the ESC control module harness side connector and body
ground.
|
| 3. |
Is the voltage within specification?
|
Check the ground circuit
| 1. |
Disconnect the connector from the ESC control module. |
| 2. |
Check for continuity between terminals 13, 38 of the ESC 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 it normal?
|
Check the hydraulic circuit for leakage
| 1. |
Refer to the hydraulic lines. |
| 2. |
Inspect leakage of the hydraulic lines. |
| 3. |
Is it normal?
|
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 ESC control module. |
| ||||||
Inspection procedures
DTC Inspection
| 1. |
Connect the GDS 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
| 1. |
Refer to the DTC troubleshooting procedures. |
| 2. |
Is it normal?
|
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 ESC control
module harness side connector and body ground when brake pedal is
depressed.
|
| 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 it normal?
|
Detecting condition
| Trouble Symptoms | Possible Cause | ||||
| Possible defect in the power supply system (including ground) for the diagnosis line. |
| ||||
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.
|
| 2. |
Is voltage within specification?
|
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?
|
Detecting condition
| Trouble Symptoms | Possible Cause | ||||
| When communication with GDS is not possible, the cause may be
probably an open in the HECU power circuit or an open in the diagnosis
output circuit. |
| ||||
Inspection procedures
Check for Continuity in the CAN Line
| 1. |
Disconnect the connector from the ESC control module. |
| 2. |
Check for continuity between terminals 26, 14 of the ESC control module connector and 3, 11 of the data link connector. |
| 3. |
Is there continuity?
|
Check the power source of ESC control module
| 1. |
Disconnect the connector from the ESC control module. |
| 2. |
Turn the ignition switch ON, measure the voltage between
terminal 29 of the ESC control module harness side connector and body
ground.
|
| 3. |
Is voltage within specification?
|
Check for poor ground
| 1. |
Check for continuity between terminal 4 of the data link connector and ground point.
|
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. |
| ||||||
Inspection procedures
Problem verification
| 1. |
Disconnect the connector from the ESC 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 (M08) and turn the ignition switch ON. |
| 2. |
Measure the voltage between terminal (M08) 29 of the cluster harness side connector and body ground.
|
| 3. |
Is voltage within specification?
|
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) 33 and 34 of the cluster harness side connector.
|
| 3. |
Is resistance within specification?
|
Check the CAN circuit wiring for ABS warning lamp
| 1. |
Disconnect the instrument cluster connector (M08) and ESC HECU connector, and then turn the ignition switch OFF. |
| 2. |
Check for continuity between terminal (M08) 33 of the cluster harness side connector and terminal 26 of ESC HECU harness side.
Check for continuity between terminal (M08) 34 of the cluster harness side connector and terminal 14 of ESC HECU harness side.
|
| 3. |
Is resistance within specification?
|
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. |
| ||||||
Inspection procedures
Check DTC Output
| 1. |
Connect the GDS to the 16P data link connector located behind the driver's side kick panel. |
| 2. |
Check the DTC output using GDS. |
| 3. |
Is DTC output?
|
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) 33 and 34 of the cluster harness side connector.
|
| 3. |
Is resistance within specification?
|
Check the CAN circuit wiring for ABS warning lamp
| 1. |
Disconnect the instrument cluster connector (M08) and ESC HECU connector, and then turn the ignition switch OFF. |
| 2. |
Check for continuity between terminal (M08) 33 of the cluster harness side connector and terminal 26 of ESC HECU harness side.
Check for continuity between terminal (M08) 34 of the cluster harness side connector and terminal 14 of ESC HECU harness side.
|
| 3. |
Is resistance within specification?
|
Schematic Diagrams
Circuit Diagram - ESC (1)
Circuit Diagram - ESC (2)
Circuit Diagram - ESC (3)
Circuit Diagram - ESC (4)
ESC connector input/output
Connector TerminalSpecificationPin NoDescription29IGNITION ...
EBD(Electronic Brake-force Distribution) Description and Operation
Operation
The EBD system (Electronic Brake force Distribution) as a
sub-system of the ABS system is to control the maximum braking
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1.
Remove the rear door trim.
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2.
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