Kia Optima: 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. |
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. |
| 4. |
Initial checkup is made in the
following cases.
| (1) |
When the failure is not
detected now |
| (2) |
When ABS and ESC are
not in control. |
| (3) |
Initial checkup is not
made after ECU power on. |
| (4) |
If the vehicle speed
is over 5 mph(8 km/h) when the brake lamp switch is off. |
| (5) |
When the vehicle speed
is over 24.8 mph(40 km/h). |
|
| 5. |
Though, it keeps on checkup even
if the brake lamp switch is on. |
| 6. |
When performing ABS or ESC control
before the initial checkup, stop the initial checkup and wait for the HECU
power input again. |
| 7. |
Judge failure in the following
cases.
| (1) |
When the power is normal. |
| (2) |
From the point in which
the vehicle speed reaches 4.9 mph(8 km/h) after HECU power 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
lamp 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
|
| 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 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.
|
| 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,
inspect 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 GDS with the data
link connector and turn the ignition switch ON. |
| 2. |
Verify that the normal code is
output. |
| 3. |
Is the normal code output?
|
|
▶ Check the power source circuit.
|
|
|
▶ Erase the DTC and recheck using GDS.
|
|
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 (3A) 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,
inspect 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 GDS with the data
link connector and turn the ignition switch ON. |
| 2. |
Verify that the normal code is
output. |
| 3. |
Is the normal code output?
|
|
▶ Check the wheel speed sensor circuit.
|
|
|
▶ Erase the DTC and recheck using GDS.
|
|
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 GDS 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?
|
|
▶ Inspect again 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) 18 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) 29 and 30 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) 29 of the cluster harness side connector and terminal 26
of ABS HECU harness side. Check for continuity between terminal (M08)
30 of the cluster harness side connector and terminal 14 of ABS HECU harness
side.
|
| 3. |
Is resistance within specification?
Connector Terminal
Specification
Remark
No
Description
29
IGNITION1(+)
High level of wake up vol ...
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