| 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. |
| 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. |
ABS warning lamp turns on when ABS is
fail. |
| 2. |
ESC operation lamp turns on and ESC function
lamp blinks when ESC is fail. |
When power voltage and
valve relay voltage are abnormal, input/output related failure judgment is
not made.
Standard
Flow of Diagnostic Troubleshooting
Notes
With Regard To Diagnosis
The phenomena listed
in the following table are not abnormal.
Phenomenon
|
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
If a normal code is
displayed during the DTC check but the problem still occurs, check the
circuits for each problem symptom in the order given in the table below
and proceed to the relevant troubleshooting page.
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, replace the ESC 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 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.
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 ESC control module. Repair if
necessary.
|
|
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.
|
|
|
▶ 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 ESC 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 ESC 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 ESC 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 ESC 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 9 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 (15A) from the engine
compartment junction
block.
|
|
Check
the Ground Circuit for the Diagnosis
| 1. |
Check for continuity between terminal 5 of
the data link connector and body
ground. |
| 2. |
Is there continuity?
|
|
▶ Repair an open in
the wire between terminal 5 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 Diagnosis Line
| 1. |
Disconnect the connector from the ESC
control module. |
| 2. |
Check for continuity between terminals 30 of
the ESC control module connector and 1 of the data link
connector. |
| 3. |
Is there continuity?
|
|
▶ Check the power
source of ESC control module.
|
|
|
▶ Repair an open in
the
wire.
|
|
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.
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 ESC control module.Repair if
necessary.
|
|
Check
for Poor Ground
| 1. |
Check for continuity between terminal 5 of
the data link connector and ground point.
|
|
▶ Replace the ESC
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 No.2 fuse (10A) in the engine
compartment junction block |
| -
|
Faulty ABS warning lamp
module |
|
Inspection
Procedures
Problem
Verification
| 1. |
Disconnect the connector the ABS HECU and
turn the ignition switch ON. |
| 2. |
Does the ABS waring lamp light
up?
|
|
▶ Check the power
source for the ABS warning lamp.
|
|
|
▶ Inspect again
after replacing the ABS
HECU.
|
|
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 (M01-C)
11 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
(M01-B) and turn the ignition switch
OFF. |
| 2. |
Measure the resistance between terminal
(M01-B) 10 and 11 of the cluster harness side
connector.
|
| 3. |
Is resistance within
specification?
|
|
▶ Check the CAN
circuit wiring for ABS warning lamp.
|
|
|
▶ Check the CAN
circuit wiring for ABS warning
lamp.
|
|
Check
The Can Circuit Wiring For ABS Warning Lamp
| 1. |
Disconnect the instrument cluster connector
(M01-B) and ESC HECU connector, and then turn the ignition switch
OFF. |
| 2. |
Check for continuity between terminal
(M01-B) 10 of the cluster harness side connector and terminal 26 of
ESC HECU harness side.
Check for continuity between terminal
(M01-B) 11 of the cluster harness side connector and terminal 14 of
ESC HECU harness side.
|
| 3. |
Is resistance within
specification?
|
|
▶ Repair short of
wiring between terminal 26, 14 of ESC HECU harness connector
and ABS warning lamp module.
|
|
|
▶ Repair open of
wiring between terminal 26, 14 of ESC 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 GDS 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?
|
|
▶ 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
(M01-B) and turn the ignition switch
OFF. |
| 2. |
Measure the resistance between terminal
(M01-B) 10 and 11 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
(M01-B) and ESC HECU connector, and then turn the ignition switch
OFF. |
| 2. |
Check for continuity between terminal
(M01-B) 10 of the cluster harness side connector and terminal 26 of
ESC HECU harness side.
Check for continuity between terminal
(M01-B) 11 of the cluster harness side connector and terminal 14 of
ESC HECU harness side.
|
| 3. |
Is resistance within
specification?
|
|
▶ Repair short of
wiring between terminal 26, 14 of ESC HECU harness connector
and ABS warning lamp module.
If
no trouble in wiring, inspect again after replacing the ABS
HECU.
|
|
|
▶ Repair open of
wiring between terminal 26, 14 of ESC HECU harness connector
and ABS warning lamp
module.
|
|
Bleeding
of Brake System
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.
| 1. |
Remove the reservoir cap and fill the brake
reservoir with brake fluid.
|
If there is any brake fluid on any
painted surface, wash it off
immediately. |
|
When pressure bleeding, do not depress
the brake pedal.
Recommended fluid........ DOT3 or
DOT4 | |
| 2. |
Connect a clear plastic tube to the wheel
cylinder bleeder plug and insert the other end of the tube into a
half filled clear plastic bottle. |
| 3. |
Connect the GDS to the data link connector
located underneath the dash panel. |
| 4. |
Select and operate according to the
instructions on the GDS screen.
|
You must obey the maximum operating
time of the ABS motor with the GDS to prevent the motor pump
from burning. |
| (2) |
Select Anti-Lock Brake
system. |
| (3) |
Select HCU air bleeding
mode.
|
| (4) |
Press "OK" to operate motor pump and
solenoid valve.
|
| (5) |
Wait 60 sec. before operating the air
bleeding.
(If not, you may damage the
motor.)
|
| (6) |
Perform the air bleeding.
| |
| 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:
6.86 ~ 12.74 N.m (0.7 ~ 1.3 kgf.m,
5.09 ~ 9.45 lb-ft)
| |
