Suzuki 2007 XL7, Руководство по обслуживанию

Страница: 1353 / 3159

ABS: 4E-3
Vehicle Stability Enhancement System (VSES)
The vehicle stability enhancement system (VSES) adds
an additional level of vehicle control to the EBCM.
Yaw rate is the rate of rotation about the vehicle's vertical
axis. The VSES is activated when the EBCM determines
that the desired yaw rate does not match the actual yaw
rate as measured by the yaw rate sensor.
The desired yaw rate is calculated from the following
parameters:
• The position of the steering wheel
• The speed of the vehicle
• The lateral, or sideways acceleration of the vehicle
The difference between the desired yaw rate and the
actual yaw rate is the yaw rate error, which is a
measurement of oversteer or understeer. If the yaw rate
error becomes too large, the EBCM attempts to correct
the vehicle's yaw motion by applying differential braking
to the appropriate wheel. The amount of differential
braking applied to the left or right front wheel is based on
both the yaw rate error and side slip rate error.
The VSES activations generally occur during aggressive
driving, in turns or on bumpy roads without much use of
the accelerator pedal. When braking during VSES
activation, the pedal pulsations feel different than the
ABS pedal pulsations. The brake pedal pulsates at a
higher frequency during VSES activation.
ECE 13 Response
The electronic brake control module (EBCM) illuminates
the ABS indicator when a malfunction which disables
ABS is detected. Usually, the ABS indicator is turned
OFF during the following ignition cycle unless the fault is
detected during that ignition cycle. However, the setting
of a wheel speed sensor related DTC causes the ABS
indicator to remain illuminated during the following
ignition cycle until the vehicle is operated at a speed
greater than 13 km/h (8 mph). This allows the EBCM to
verify that no malfunction exists, before turning OFF the
ABS indicator. This reaction occurs even if the ABS
indicator turns OFF when the scan tool is used to clear
the DTCs. When repairing these vehicles, it is important
to ensure that the ECE 13 response has occurred and
that the ABS indicator does not illuminate after returning
the vehicle to the customer. It is also important to verify
that ECE 13 is not the cause of an ABS indicator which
is illuminated when no DTCs are set, before attempting
to diagnose other possible causes.
Driver Information Indicators and Messages
The following indicators are used to inform the driver of
several different factors.
Brake Warning Indicator
The instrument panel cluster (IPC) illuminates the brake
warning indicator when the following occurs.
• The electronic brake control module (EBCM) detects
that the park brake is engaged. The IPC receives a
serial data message from the EBCM requesting
illumination.
• The instrument panel cluster (IPC) detects a low
brake fluid condition and the IPC will illumination the
brake warning indicator.
• The IPC performs the bulb check.
• The EBCM detects an ABS-disabling malfunction
which also disables electronic brake force distribution
(EBD) and sends a serial data message to the IPC
requesting illumination.
Stability System Indicator
The IPC illuminates the stability system caution indicator
when one or more of the following conditions exists. The
EBCM sets any one of many VSES-disabling DTCs. The
EBCM sends a serial data message to the IPC
requesting illumination.
ABS Indicator
The instrument panel cluster (IPC) illuminates the
Antilock Brake System (ABS) indicator when the
following occurs:
• The electronic brake control module (EBCM) detects
a malfunction with the antilock brake system. The IPC
receives a serial data message from the EBCM
requesting illumination.
• The IPC performs the displays test at the start of each
ignition cycle. The indicator illuminates for
approximately 5 seconds.
• The IPC detects a loss of serial data communications
with the EBCM.
Traction Control System Indicator
TRAC OFF
The instrument panel cluster (IPC) illuminates the TRAC
OFF indicator when the following occurs:
• The electronic brake control module (EBCM) inhibits
the traction control system due to a malfunction in the
traction control system. The IPC receives a serial data
message from the EBCM requesting illumination.
• The Body Control module (BCM) detects that the
traction control switch has been pressed (signal circuit
is low). The Body Control module (BCM) sends a
serial data message to the EBCM in order to disable
traction control. The IPC receives a serial data
message from the EBCM requesting illumination. The
BCM sends a serial data message to the radio in
order to activate an audible warning.