Suzuki XL7 2007 Service Manual page 1351

ABS
ABS Component Handling Caution
WARNING
!
Certain components in the Antilock Brake System (ABS) are not intended to be serviced individually.
Attempting to remove or disconnect certain system components may result in personal injury and/or
improper system operation. Only those components with approved removal and installation
procedures should be serviced.
ABS Description and Operation
This vehicle is equipped with the Continental Teves MK
25E antilock braking system.
The vehicle is equipped with the following braking
systems:
• Antilock Brake System (ABS)
• Electronic Brake Force Distribution (EBD)
• Traction Control System (TCS)
• Vehicle Stability Enhancement System (VSES) (w/
JL4)
The following components are involved in the operation
of the above systems:
• Electronic Brake Control Module (EBCM) - The EBCM
controls the system functions and detects failures.
The EBCM contains the following components:
– Motor Relay - The motor relay is energized when
the ignition is ON and no ABS DTCs are present. It
supplies battery positive voltage to the pump motor.
– Valve Relay - The valve relay is energized when the
ignition is ON and no ABS DTCs are present. It
supplies battery positive voltage to the solenoid
valves.
• Brake Pressure Modulator Valve (BPMV) - The BPMV
contains the hydraulic valves and pump motor that are
controlled electrically by the EBCM. The BPMV uses
a 4 circuit configuration with a diagonal split. The
BPMV directs fluid from the reservoir of the master
cylinder to the left front and right rear wheels and fluid
from the other reservoir to the right front and left rear
wheels. The diagonal circuits are hydraulically
isolated so that a leak or malfunction in one circuit will
allow continued braking ability on the other.
NOTE
There is a rubber isolator located under the
BPMV and on the mounting studs. The
rubber isolators protect the BPMV and the
EBCM from vehicle vibrations.
Precautions
General Description
The BPMV contains the following components:
– ABS pump Motor and pump
– Inlet Valves (one per wheel)
– Outlet Valves (one per wheel)
– Master Cylinder Isolation Valves (one per drive
– Prime Valves (one per drive wheel)
– A master cylinder pressure sensor
• The wheel speed sensor receives a 12-volt power
supply voltage from the electronic brake control
module (EBCM) and provides an output signal to the
EBCM. As the wheel spins, the wheel speed sensor
sends the EBCM a DC square wave signal. The
EBCM uses the frequency of the square wave signal
to calculate the wheel speed.
• Traction Control Switch - The TCS is manually
disabled or enabled using the traction control switch.
• Stoplamp Switch - The EBCM uses the stoplamp
switch as an indication that the brake pedal is applied.
• Lateral Accelerometer Sensor (w/JL4) - The EBCM
uses the lateral accelerometer sensor as an indication
of the lateral acceleration of the vehicle.
• Yaw Rate Sensor (w/JL4) - The EBCM uses the yaw
rate sensor as an indication of the yaw rate of the
vehicle.
• Steering Wheel Position Sensor (SWPS) (w/JL4) -
The EBCM uses the SWPS as an indication of the
position and rotation of the steering wheel.
wheel)
ABS: 4E-1