Suzuki GRAND VITARA JB416, Service Manual

Page: 265 / 474

Electronic Stability Program: 4F-2
Precautions in Sensor Calibration
S5JB0E4600004
ESP
®
control module stores calibration points data of yaw rate / G sensor assembly and master cylinder pressure
sensor. Steering angle sensor stores calibration point data of itself.
TCS and stability control system use these sets of data.
When the following operation is done, calibration should be performed since the original calibration points are deleted.
Perform sensor calibration according to “Sensor Calibration: ”.
Precautions in Speedometer Test or Other Tests
S5JB0E4600005
When performing speedometer or a bench test while rotating a tire, ESP
®
function must be kept at stop. It is possible
to stop ESP
®
function temporarily by ESP
®
OFF switch. In this case, however, the function is forced to come back to
work when the speed exceeds 30 km/h (18.5 mph) and may hinder accurate testing.
There are two ways to stop the ESP
®
function completely as described bellow.
• Connect the SUZUKI scan tool, set to the “MISC. TEST” mode to stop the ESP
®
function. Refer to SUZUKI scan
tool operator's manual for further details.
• Disconnect the connector of the steering angle sensor, and ESP
®
function is forced to enter the fail-safe mode,
then ESP
®
function is stopped.
However, when this method is used, DTC remains in the memory of the ESP
®
control module. Therefore, after the
test, re-connect the connector, clear DTC in the memory of the ESP
®
control module. And calibrate steering angle
sensor referring to “Sensor Calibration: ”.
General Description
Electronic Stability Program Description
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Electronic Stability Program (ESP
®
) main function is to
control ABS / EBD, TCS and stability.
• ABS / EBD
ABS function is that four wheel brake forces are
independently varied with referring each wheel slip
condition.
EBD function is that front and rear wheel braking
forces are varied with referring loading distribution of
the vehicle.
ABS improves the vehicle stability, controllability and
braking performance.
For the details, refer to “ABS Description: in Section
4E”.
• TCS (Traction Control System)
TCS function is that engine torque is controlled and
brake is applied with referring wheel spin condition
during vehicle starting and accelerating.
• Stability control system
Stability control system is that engine torque is
controlled and brake is applied with referring vehicle
condition (over steering, under steering) during
cornering.
ESP
®
is a registered trademark of Daimler Chrysler AG.
ESP
®
Hydraulic Unit / Control Module
Assembly Description
S5JB0E4601002
ESP
®
control module is a component of ESP
®
hydraulic
unit / control module assembly and has the following
functions.
Self-Diagnosis Function
ESP
®
control module monitors each input and output
signals. When ESP
®
control module detects any
malfunction, some of ABS warning lamp (1), EBD
warning lamp (brake warning lamp) (2), ESP
®
warning
lamp (3), SLIP indicator lamp (4), ESP
®
OFF lamp (5)
are turned ON and indicate the abnormality to driver.
• When ignition switch is turned ON, ABS warning
lamp, EBD warning lamp, ESP
®
warning lamp, SLIP
indicator lamp and ESP
®
OFF lamp light for 2
seconds to check its circuit.
Sensor Procedures required calibration
Steering angle sensor • Power is not supplied to steering angle sensor. (battery and/or fuse is removed.)
• Steering angle sensor is replaced.
• Power is not supplied to ESP
®
control module. (battery, fuse and/or connector is
removed.)
• ESP
®
hydraulic unit / control module assembly is replaced.
Master cylinder pressure sensor • ESP
®
hydraulic unit / control module assembly is removed or replaced.
Yaw rate / G sensor assembly • Yaw rate / G sensor assembly is removed or replaced.
• ESP
®
hydraulic unit / control module assembly is replaced.