vent ACURA CSX 2006 Service Repair Manual

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19-45
Brake Pedal Cover Replacement
A B
C
A
B
C A
B
B
NOTE: This procedure shows a model equipped with a
metal brake pedal cover.
1. Cover the carpet under the brake pedal to pr event
metal shavings from getting on the carpet.
2. Center-punch each of rivets (A), and drill their heads off with a 3 mm (0.12 in.) drill bit (B).
NOTE: Do not drill the brake pedal pad (C).
3. Remove the brake pedal plate (A) and the brake pedal cover (B) from the brake pedal pad (C). 4. Set the brake pedal cover to the brake pedal plate.
5. Install the brake pedal plate (A) with the rivets (B)
firmly.
6. Make sure the brake pedal cover and plate is securely fastened on the brake pedal.
7. Check the brake pedal height (see page 19-6).
08/08/21 15:02:12 61SNR030_190_0045
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Brakes
....................................
Conventional Brake Components . 19-1
ABS (Anti-lock Brake System)
Components (’06-07 Models)
...................... ......................
VSA (Vehicle Stability Assist) System
Components (’07-09 Models) . 19-95
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Component Location Index
. 19-48
General Troubleshooting Information . 19-49
DTC Troubleshooting Index . 19-52
Symptom Troubleshooting Index . 19-55
System Description . 19-56
Circuit Diagram . 19-62
DTC Troubleshooting . 19-65
Symptom Troubleshooting . 19-88
ABS Modulator-Control Unit Removal and Installation . 19-90
Wheel Speed Sensor Replacement . 19-92
08/08/21 15:02:12 61SNR030_190_0047
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System IndicatorABS Indicator
Brake System Indicator
19-49
General Troubleshooting Information
AB
This system has two indicators: ABS indicator (A)
 Brake system indicator (B)
When the system is OK, each indicator comes on for
about 2 seconds after turning the ignition switch to
ON (II), then goes off.
When the system detects a problem, a DTC is set and,
depending upon the failure, the ABS modulator-control
unit determines which indicator(s) are turned on. If the
problem goes away (system returns to normal), the
indicator(s) are controlled in the following way
depending upon the DTC that is set:  The indicator(s) come on and stay on when the ignition switch is ON (II).
 The indicator(s) automatically go off.
 The indicator(s) go off after the vehicle is driven. The ABS indicator comes on when the ABS function is
lost. The brakes still work like a conventional system.
The brake system indicator comes on when the EBD
function is lost, the parking brake is applied, and/or the
brake fluid level is low.
NOTE: If two or more wheel speed sensors fail, the
brake system indicator comes on.
(cont’d)
08/08/21 15:02:15 61SNR030_190_0049
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ABS Features
Grip force of tire and road surface
Main control
19-59
TARGET SLIP RATEROTATIONAL
DIRECTION
RADIAL
DIRECTION
OF THE
ROTATIONAL
DIRECTION
SLIP RATE
COEFFICIENT OF
FRICTION
LEFT-REAR
WHEEL SPEED
SENSOR
RIGHT-REAR
WHEEL SPEED
SENSOR
LEFT-FRONT
WHEEL SPEED
SENSOR RIGHT-FRONT
WHEEL SPEED
SENSOR Select Low
Speed Wheel
Detect
Vehicle Speed
Drive
SolenoidRIGHT-REAR
SOLENOID
LEFT-REAR
SOLENOID
RIGHT-FRONT
SOLENOID
LEFT-FRONT
SOLENOID
CONTROL UNIT
ABS
Control
Reference
Slip Rate
Drive
Solenoid
ABS
Control
Drive
Solenoid
ABS
Control
Drive
Solenoid
ABS
Control
RIGHT-FRONT
LEFT-FRONT
Detect
Wheel Speed
Detect
Slip Rate
RIGHT-REAR
LEFT-REAR Detect
Slip Rate
Detect
Slip Rate
Detect
Slip Rate
Detect
Wheel Speed
Detect
Wheel Speed
Detect
Wheel Speed
Without ABS, when the brake pedal is pressed while driving, the wheels sometimes lock before the vehicle comes to a
stop. In such an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of
the vehicle is reduced if the rear wheels are locked, creating an extremely unstable condition. With ABS, the system
precisely controls the slip rate of the wheels to ensure maximum grip force from the tires, and it thereby ensures
maneuverability and stability of the vehicle. The ABS calculates the slip rate of the wheels based on the four wheel
speeds, and then it controls the brake fluid pressure to reach the target slip rate.
The control unit detects the wheel speed based on the wheel speed sensor signals it receives, then it calculates the
vehicle speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration
based on the wheel speeds.
The control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit solenoid
valve when the slip rate is high.
The hydraulic control has three modes: Pressure intensifying, pressure reducing, and pressure retaining.
(cont’d)
08/08/21 15:02:17 61SNR030_190_0059
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Removal
19-90ABS Components
ABS Modulator-Control Unit Removal and Installation
A
B C
15 N·m
(1.5 kgf·m, 11 lbf·ft)
D
E
I F
G
H 15 N·m
(1.5 kgf·m, 11 lbf·ft)
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft) 9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
NOTE:
 Do not spill brake fluid on the vehicle; it may damage the paint; if brake fluid gets on the paint, wash it off immediately with water.
 Be careful not to damage or deform the brake lines during removal and installation.
 Plug the ends of the hoses and the joints to prevent spilling brake fluid.
1. Turn the ignition switch to LOCK (0).
2. Disconnect the ABS modulator-control unit 25P connector (A) by pu lling up the lock (B); the connector disconnects
itself.
3. Disconnect the six brake lines from the ABS modulator-control unit. NOTE: Brake lines are connected to the master cylinder (C) and to the right-front (D), the left-rear (E), the right-rear
(F), and the left-front (G) brake systems.
4. Remove the ABS modulator-control unit (H) with the brackets (I) from the body.
5. Remove the ABS modulator-control unit from the brackets.
6. Separate the bracket if necessary.
08/08/21 15:03:18 61SNR030_190_0090
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19-94ABS Components
Wheel Speed Sensor Replacement (cont’d)
B
A
A
07AAG-SVBA100 B
07AAG-SVBA100
A
4. Apply multi-purpose grease to the wheel speedsensor O-ring (A) and the sensor hole in the knuckle
(B).
5. Insert the guide pin tool (A) into the wheel speed sensor bolt hole until the shoulder of the tool
contacts the wheel speed sensor bracket.
NOTE: To prevent O-ring damage, the wheel speed
sensor must be installed with the guide pin tool. 6. Insert the wheel speed sensor (A) and the guide pin
tool (B) into the bolt hole on the knuckle.
NOTE: To ensure proper alignment when pushing
the wheel speed sensor into the knuckle housing,
do not hold the sensor bracket during installation,
hold the sensor wire.
7. Gently push and pull the wheel speed sensor in and out to make sure the O-ring is sliding properly in its
housing. While you are doing this, make sure the
sensor doesn’t come out of the knuckle assembly. If
the sliding effort is too high, remove the wheel
speed sensor, inspect the O-ring for damage, and
start the installation process again.
8. Remove the guide pin tool, then install the bolt, and tighten it to specified torque.
9. Clean the mating surfaces between the brake disc and the inside of the wheel, then install the front
wheel.
10. Start the engine, and make sure the ABS indicators go off.
11. Test-drive the vehicle, and make sure the ABS indicators do not come on.
08/08/21 15:04:46 61SNR030_190_0094
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System IndicatorABS Indicator
Brake System Indicator
VSA Indicator
VSA Activation Indicator
19-97
General Troubleshooting Information
A
D B
C
This system has four indicators:
 ABS indicator (A)
 Brake system indicator (B)
 VSA indicator (C)
 VSA activation indicator (D)
When the system is OK, each indicator comes on for
about 2 seconds after turning the ignition switch to
ON (II), then goes off.
When the system detects a problem, a DTC is set and,
depending upon the failure, the VSA modulator-control
unit determines which indicator(s) are turned on. If the
problem goes away (system returns to normal), the
indicator(s) are controlled in the following way
depending upon the DTC that is set:  The indicator(s) come on and stay on when the ignition switch is ON (II).
 The indicator(s) automatically go off.
 The indicator(s) go off after the vehicle is driven. The ABS indicator comes on when the ABS function is
lost. The brakes still work like a conventional system.
The brake system indicator comes on when the EBD
function is lost, the parking brake is applied, and/or the
brake fluid level is low.
NOTE: If two or more wheel speed sensors fail, the
brake system indicator comes on.
The VSA indicator comes on when the VSA function is
lost.
The VSA activation indicator blinks when the VSA
function is activating. The VSA activation indicator
comes on and stays on when the VSA is turned OFF by
using the VSA OFF switch, or when the VSA function is
lost.
(cont’d)
08/08/21 15:04:50 61SNR030_190_0097
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ABS Features
Anti-lock control
Grip force of tire and road surface
Main Control
19-109
COEFFICIENT OF
FRICTIONTARGET SLIP RATE
ROTATIONAL
DIRECTION
RADIAL
DIRECTION
OF THE
ROTATIONAL
DIRECTION
SLIP RATE
LEFT-REAR
WHEEL SPEED
SENSOR RIGHT-REAR
WHEEL SPEED
SENSOR
LEFT-FRONT
WHEEL SPEED
SENSOR RIGHT-FRONT
WHEEL SPEED
SENSOR Select Low
Speed Wheel
Detect
Vehicle Speed
Drive
SolenoidRIGHT-REAR
SOLENOID
LEFT-REAR
SOLENOID
RIGHT-FRONT
SOLENOID
LEFT-FRONT
SOLENOID
CONTROL UNIT
ABS
Control
Reference
Slip Rate
Drive
Solenoid
ABS
Control
Drive
Solenoid
ABS
Control
Drive
Solenoid
ABS
Control
RIGHT-FRONT
LEFT-FRONT
Detect
Wheel Speed
Detect
Slip Rate
RIGHT-REAR
LEFT-REAR Detect
Slip Rate
Detect
Slip Rate
Detect
Slip Rate
Detect
Wheel Speed
Detect
Wheel Speed
Detect
Wheel Speed
Without ABS, when the brake pedal is pressed while driving, the wheels sometimes lock before the vehicle comes to a
stop. In such an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of
the vehicle is reduced if the rear wheels are locked, creating an extremely unstable condition. With ABS, the system
precisely controls the slip rate of the wheels to ensure maximum grip force from the tires, and it thereby ensures
maneuverability and stability of the vehicle. The ABS calculates the slip rate of the wheels based on the four wheel
speeds, and then it controls the brake fluid pressure to reach the target slip rate.
The control unit detects the wheel speed based on the wheel speed sensor signals it receives, then it calculates the
vehicle speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration
based on the wheel speeds.
The control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit solenoid
valve when the slip rate is high.
The hydraulic control has three modes: Pressure intensifying, pressure reducing, and pressure retaining.
(cont’d)
08/08/21 15:04:53 61SNR030_190_0109
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Removal
19-171
VSA Modulator-Control Unit Removal and Installation
A C
B
I
E
F
G
H
J
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft) 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
15 N·m (1.5 kgf·m, 11 lbf·ft)
D
22 N·m
(2.2 kgf·m, 16 lbf·ft)
NOTE: Do not spill brake fluid on the vehicle; it may damage the paint; if brake fluid gets on the paint, wash it off immediately with water.
 Be careful not to damage or deform the brake lines during removal and installation.
 Plug the ends of the hoses and the joints to prevent spilling brake fluid.
1. Turn the ignition switch to LOCK (0).
2. Disconnect the VSA modulator-control unit 37P connector (A) by pushing the lock (B) and pu lling down the lever
(C); the connector disconnects itself.
3. Disconnect the six brake lines from the VSA modulator-control unit. NOTE: Brake lines are connected to the master cylinder (D) and to the right-front (E), the left-rear (F), the right-rear
(G), and the left-front (H) brake systems.
4. Remove the VSA modulator-control unit (I) with the bracket (J) from the body.
5. Remove the VSA modulator-control unit from the bracket. (cont’d)
08/08/21 15:06:47 61SNR030_190_0171
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19-175
A
B
A
07AAG-SVBA100 B
07AAG-SVBA100
A
4. Apply multi-purpose grease to the wheel speedsensor O-ring (A) and the sensor hole in the knuckle
(B).
5. Insert the guide pin tool (A) into the wheel speed sensor bolt hole until the shoulder of the tool
contacts the wheel speed sensor bracket.
NOTE: To prevent O-ring damage, the wheel speed
sensor must be installed with the guide pin tool. 6. Insert the wheel speed sensor (A) and the guide pin
tool (B) into the bolt hole on the knuckle.
NOTE: To ensure proper alignment when pushing
the wheel speed sensor into the knuckle housing,
do not hold the sensor bracket during installation,
hold the sensor wire.
7. Gently push and pull the wheel speed sensor in and out to make sure the O-ring is sliding properly in its
housing. While you are doing this, make sure the
sensor doesn’t come out of the knuckle assembly. If
the sliding effort is too high, remove the wheel
speed sensor, inspect the O-ring for damage, and
start the installation process again.
8. Remove the guide pin tool, then install the bolt, and tighten it to specified torque.
9. Clean the mating surfaces between the brake disc and the inside of the wheel, then install the front
wheel.
10. Start the engine, and make sure the ABS and the VSA indicators go off.
11. Test-drive the vehicle, and make sure the ABS and the VSA indicators do not come on.
08/08/21 15:06:48 61SNR030_190_0175
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