268954910-Renault-Scenic.pdf
- No tags were found...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
ANTI-LOCK BRAKING SYSTEM<br />
Introduction<br />
38C<br />
diagnostic tool<br />
Essential equipment<br />
The vehicle is fitted with a BOSCH 8.0. ABS system.<br />
Depending on the vehicle equipment, the BOSCH 8.0<br />
system consists of the ABS system only or the Antilock<br />
Braking System in conjunction with the Electronic<br />
Stability Program (ESP).<br />
IMPORTANT<br />
After any operation on the ESP system, it is essential<br />
to confirm the repair with a road test and a<br />
check with the diagnostic tool (CLIP).<br />
I - DESCRIPTION OF THE ABS SYSTEM WITH<br />
ELECTRONIC STABILITY PROGRAM<br />
Where there is a difference between the desired trajectory<br />
and the actual trajectory, the appropriate wheel is<br />
braked. In certain cases, the understeer monitoring<br />
brakes two wheels at the same time. The torque generated<br />
sets the vehicle on the desired trajectory.<br />
In some cases, the anti-skid control modifies the engine<br />
torque.<br />
III - ELECTRONIC STABILITY PROGRAM<br />
OPERATION SPECIAL FEATURES<br />
The ESP function can be disconnected via the switch<br />
located on the dashboard.<br />
This function can not be deactivated above a threshold<br />
of approximately 50 km per hour.<br />
This function is automatically reactivated when the vehicle<br />
is switched on, or at speeds above approximately<br />
50 km/h.<br />
The ABS system / Electronic Stability Program comprises:<br />
-a brake servo assembly,<br />
-a pump assembly comprising:<br />
•a hydraulic pump,<br />
•a pressure modulation unit (twelve solenoid valves),<br />
•a computer,<br />
•a pressure sensor,<br />
-a steering wheel angle sensor built into the electric<br />
power assisted steering,<br />
-a combined yaw speed and transverse acceleration<br />
sensor,<br />
- four wheel speed sensors,<br />
- aneElectronic stability program deactivation pressure<br />
button.<br />
II - PRINCIPLE OF OPERATION OF THE ABS<br />
SYSTEM WITH ELECTRONIC STABILITY<br />
PROGRAM<br />
The reference status is calculated continuously from<br />
wheel speed and steering wheel angle measurements.<br />
The reference status represents the desired correct<br />
behaviour.<br />
This reference status is compared to the actual status<br />
of the vehicle from the yaw speed and transverse acceleration<br />
measurements.<br />
38C-1
Change language