2006 ACURA CSX brake sensor

Î
18-46Rear Suspension
Spring Replacement (cont’d)
A
B
6x1.0mm
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
8x1.25mm
22 N·m
(2.2 kgf·m, 16 lbf·ft) (Multipurpose)
9. Install the wheel speed sensor (A), and the brake
hose (B).
NOTE: Apply multipurpose grease to the mating surfaces on the knuckle and the O-ring during
reassembly.
 To prevent O-ring damage, the wheel speed sensor must be installed with the guide pin tool
(see step 5 on page 19-175).
10. Clean the mating surfaces of the brake disc and the inside of the wheel, then install the rear wheel.
11. Check the wheel alignment, and adjust it if necessary (see page 18-5).
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DYNOMITE -2009-

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µ
µ µ
µ
µ
µ
DTC 21, 22, 23, 24:
YES
NO
DTC Tire Pressure Sensor Number YES
NO
YES
NO
18-64TPMS
DTC Troubleshooting (cont’d)
Tire Pressure Sensor
Abnormally High Temperature
1. Turn the ignition switch to LOCK (0).
2. Make sure the tires have cooled down.
NOTE: An abnormal rise in the internal temperature
of the tires can be caused by Excessive braking
 Failure to release the parking brake (rear tires only)
 Leaving the vehicle r unning while parked (front
tires only)
 Improper assembly of a wheel and tire
3. Test-drive the vehicle at 45 km/h (28 mph) or more for at least 1 minute.
The system is OK at this time. Clear the DTC
with the HDS.
Go to step 4.
4. Check for DTCs with the HDS.
5. Note the tire pressure sensor(s) number by the indicated DTC.
21 No. 1
22 No. 2
23 No. 3
24 No. 4 6. Do the tire pressure sensor location procedure to
determine the affected tire location and relate it to
the tire pressure sensor number (see page 18-53).
7. Check the TIRE 1, TIRE 2, TIRE 3, or TIRE 4 AIR TEMPERATURE in the TPMS DATA LIST with the
HDS.
Replace the appropriate tire pressure sensor
(see page 18-76).
Go to step 8.
8. Clear the DTC with the HDS.
9. Test-drive the vehicle at 45 km/h (28 mph) or more for at least 1 minute.
10. Check for DTCs with the HDS.
Check for loose terminals and poor
connections at the TPMS control unit. If necessary,
substitute a known-good TPMS control unit
(see page 18-75), and recheck.
If any other DTCs are indicated, troubleshoot
the appropriate DTC. If no DTC are indicated, the
system is OK at this time.
Does t he T PM S i nd i cat or go of f ? I s 80 ° C ( 17 6 ° F ) or mor e i nd i cat ed ?
Is DT C 21, 22, 23, or 24 indicated?
08/08/21 14:58:59 61SNR030_180_0064
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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
........................................
......................
....................................... ..............................
.....................................................
............................................................ ..........................................................................................
........................................ ...........................
........................................
......................
....................................... ..............................
.....................................................
............................................................ ..........................................................................................
........................................ ...........................
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
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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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DTCDetection Item ABS Indicator Brake System
Indicator Note
19-52ABS Components
DTC Troubleshooting Index
11 -13 Right-front Wheel Speed Sensor Circuit Malfunction
ONON/OFF (see page 19-65)
12 -11 Right-front Wheel Speed Sensor Electrical Noise or Intermittent Interruption ON
ON/OFF (see page 19-68)
-12 Right-front Wheel Speed Sensor Short to the Other Sensor Circuit ONON/OFF (see page 19-69)
-21 Right-front Wheel Speed Sensor Installation Error ONON/OFF (see page 19-71)
-22 Right-front Wheel Speed Sensor Installation Error (30 km/h (19 mph) or More) ON
ON/OFF (see page 19-71)
-23 Right-front Wheel Speed Sensor Installation Error (0 to 15 km/h (0 to 9 mph) ) ON
ON/OFF (see page 19-72)
13 -13 Left-front Wheel Speed Sensor Circuit Malfunction ONON/OFF (see page 19-65)
14 -11 Left-front Wheel Speed Sensor Electrical Noise or Intermittent Interruption ON
ON/OFF (see page 19-68)
-12 Left-front Wheel Speed Sensor Short to the Other Sensor Circuit ONON/OFF (see page 19-69)
-21 Left-front Wheel Speed Sensor Installation Error ONON/OFF (see page 19-71)
-22 Left-front Wheel Speed Sensor Installation Error (30 km/h (19 mph) or More) ON
ON/OFF (see page 19-71)
-23 Left-front Wheel Speed Sensor Installation Error (0 to 15 km/h (0 to 9 mph) ) ON
ON/OFF (see page 19-72)
15 -13 Right-rear Wheel Speed Sensor Circuit Malfunction ONON/OFF (see page 19-65)
16 -11 Right-rear Wheel Speed Sensor Electrical Noise or Intermittent Interruption ON
ON/OFF (see page 19-68)
-12 Right-rear Wheel Speed Sensor Short to the Other Sensor Circuit ONON/OFF (see page 19-69)
-21 Right-rear Wheel Speed Sensor Installation Error ONON/OFF (see page 19-71)
-22 Right-rear Wheel Speed Sensor Installation Error (30 km/h (19 mph) or More) ON
ON/OFF (see page 19-71)
-23 Right-rear Wheel Speed Sensor Installation Error (0 to 15 km/h (0 to 9 mph) ) ON
ON/OFF (see page 19-72)
17 -13 Left-rear Wheel Speed Sensor Circuit Malfunction ONON/OFF (see page 19-65)
18 -11 Left-rear Wheel Speed Sensor Electrical Noise or Intermittent Interruption ON
ON/OFF (see page 19-68)
-12 Left-rear Wheel Speed Sensor Short to the Other Sensor Circuit ONON/OFF (see page 19-69)
-21 Left-rear Wheel Speed Sensor Installation Error ONON/OFF (see page 19-71)
-22 Left-rear Wheel Speed Sensor Installation Error (30 km/h (19 mph) or More) ON
ON/OFF (see page 19-71)
-23 Left-rear Wheel Speed Sensor Installation Error (0 to 15 km/h (0 to 9 mph) ) ON
ON/OFF (see page 19-72)
21 -11 Right-front Magnetic Encoder (Wheel Bearing) Malfunction (Pulse Missing) ON
ON/OFF (see page 19-72)
22 -11 Left-front Magnetic Encoder (Wheel Bearing) Malfunction (Pulse Missing) ON
ON/OFF (see page 19-72)
23 -11 Right-rear Magnetic Encoder (Wheel Bearing) Malfunction (Pulse Missing) ON
ON/OFF (see page 19-72)
24 -11 Left-rear Magnetic Encoder (Wheel Bearing) Malfunction (Pulse Missing) ON
ON/OFF (see page 19-72)
31 -01 ABS Right-front Inlet Solenoid Valve Malfunction (Solenoid Initial Pulse) ON
ON (see page 19-73)
-21 ABS Right-front Inlet Solenoid Valve Malfunction (Solenoid Pulse) ON
ON (see page 19-73)
-22 ABS Right-front Inlet Solenoid Valve Malfunction (Solenoid Speculative) ON
ON (see page 19-73)
-23 ABS Right-front Inlet Solenoid Valve Malfunction (Solenoid Stuck ON) ON
ON (see page 19-73)
32 -01 ABS Right-front Outlet Solenoid Valve Malfunction (Solenoid Initial Pulse) ON
ON (see page 19-73)
-21 ABS Right-front Outlet Solenoid Valve Malfunction (Solenoid Pulse) ON
ON (see page 19-73)
-22 ABS Right-front Outlet Solenoid Valve Malfunction (Solenoid Speculative) ON
ON (see page 19-73)
-23 ABS Right-front Outlet Solenoid Valve Malfunction (Solenoid Stuck ON) ON
ON (see page 19-73)
33 -01 ABS Left-front Inlet Solenoid Valve Malfunction (Solenoid Initial Pulse) ON
ON (see page 19-73)
-21 ABS Left-front Inlet Solenoid Valve Malfunction (Solenoid Pulse) ON
ON (see page 19-73)
-22 ABS Left-front Inlet Solenoid Valve Malfunction (Solenoid Speculative) ON
ON (see page 19-73)
-23 ABS Left-front Inlet Solenoid Valve Malfunction (Solenoid Stuck ON) ON
ON (see page 19-73)
: Brake system indicator turns ON when two or more wheels fail.
08/08/21 15:02:16 61SNR030_190_0052
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System Outline
19-58ABS Components
System Description (cont’d)
ECM/PCM
WHEEL SPEED SENSORS
Control mode signal
Indicators drive signal  Brake pedal position switch signal
 Service check signal
Wheel rotation pulse signal
CONTROL UNIT
MODULATOR UNIT ABS MODULATOR-
CONTROL UNIT
 Solenoid control
 Motor control
Communication via F-CAN
PARKING
BRAKE
SWITCH
BRAKE
FLUID
LEVEL
SWITCH BRAKE
PEDAL
POSITION
SWITCH
GAUGE CONTROL MODULE (TACH)
This system is composed of the ABS modulator-control unit, the wheel speed sensors, and the system indicators in
the gauge control module (tach). The ABS modulator-control unit controls the anti-lock brake and the brakes
distribution function.
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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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EBD Features
19-60ABS Components
System Description (cont’d)
REAR WHEEL
BRAKE PRESSURE
With EBD under HEAVY LOAD
at REAR WHEELS
With EBD under LIGHT LOAD
at REAR WHEELS
Without EBD
FRONT WHEEL BRAKE PRESSURE
The electronic brake distribution (EBD) feature helps control vehicle braking by adjusting the rear brake force in
accordance with the rear wheel load before the ABS operates. Based on the wheel speed sensor signals, the control
unit uses the modulator to control the rear brakes individually. When the rear wheel speed is less than the front wheel
speed, the ABS modulator-control unit retains the current rear brake fluid pressure by closing the inlet valve in the
modulator. As the rear wheel speed increases, and approaches the front wheel speed, the ABS modulator-control unit
increases the rear brake fluid pressure by momentarily opening the inlet valve. This whole process is repeated very
rapidly. While this is happening, kickback may be felt at the brake pedal.
08/08/21 15:02:18 61SNR030_190_0060
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