Renault Scenic 3 Chassis. Manual — part 47
38C
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1
ANTI-LOCK BRAKING SYSTEM
Introduction
38C
The vehicle is fitted with a BOSCH 8.0. ABS system.
Depending on the vehicle equipment, the BOSCH 8.0
system consists of the ABS system only or the Anti-lock
Braking System in conjunction with the Electronic Sta-
bility Program (ESP).
I - DESCRIPTION OF THE ABS SYSTEM WITH
ELECTRONIC STABILITY PROGRAM
The ABS system / Electronic Stability Program compri-
ses:
- a brake servo assembly,
- a pump assembly comprising:
• a hydraulic pump,
• a pressure modulation unit (twelve solenoid valves),
• a computer,
• a pressure sensor,
- a steering wheel angle sensor built into the electric
power assisted steering,
- a combined yaw speed and transverse acceleration
sensor,
- four wheel speed sensors,
- aneElectronic stability program deactivation pressure
button.
II - PRINCIPLE OF OPERATION OF THE ABS
SYSTEM WITH ELECTRONIC STABILITY
PROGRAM
The reference status is calculated continuously from
wheel speed and steering wheel angle measurements.
The reference status represents the desired correct be-
haviour.
This reference status is compared to the actual status
of the vehicle from the yaw speed and transverse acce-
leration measurements.
Where there is a difference between the desired trajec-
tory and the actual trajectory, the appropriate wheel is
braked. In certain cases, the understeer monitoring
brakes two wheels at the same time. The torque gene-
rated sets the vehicle on the desired trajectory.
In some cases, the anti-skid control modifies the engine
torque.
III - ELECTRONIC STABILITY PROGRAM
OPERATION SPECIAL FEATURES
The ESP function can be disconnected via the switch
located on the dashboard.
This function can not be deactivated above a threshold
of approximately 50 km per hour.
This function is automatically reactivated when the ve-
hicle is switched on, or at speeds above approximately
50 km/h.
Equipment required
Diagnostic tool
IMPORTANT
After any operation on the ESP system, it is essen-
tial to confirm the repair with a road test and a check
with the Diagnostic tool (CLIP).
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2
ANTI-LOCK BRAKING SYSTEM
Hydraulic unit: Introduction
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The ABS system pump assembly is equipped with a
26-track computer.
The ABS System and Electronic Stability Program
pump assembly is equipped with a 46-track computer.
102311
102384
Note:
The computer cannot be separated from the pump
assembly.
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3
ANTI-LOCK BRAKING SYSTEM
Hydraulic unit
K4J
38C
REMOVAL
Disconnect the battery, starting with the negative ter-
minal.
Fit a pedal press tool to the brake pedal to limit the
outflow of brake fluid.
Drain the refrigerant circuit using the filling station
tool.
Remove the cowl grille ( Wiping - WashingSection).
Remove:
- the engine covers,
- the two air filter access panel mounting bolts (1),
- the plenum chamber partition mounting bolts (2),
- the plenum chamber partition.
Remove the plenum chamber bracket (3)
Equipment required
pedal press
filling station
Diagnostic tool
Tightening torques
m
0.65 daNm
bolts securing the pipes
on the hydraulic unit
1.4 daNm
air distributor mounting
bolts
0.9 daNm
hydraulic unit - support
mounting bolts
0.8 daNm
AIR CONDITIONING or CLIMATE CONTROL
104343
104246
104666
2
1
2
2
3
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4
ANTI-LOCK BRAKING SYSTEM
Hydraulic unit
K4J
38C
Remove:
- the air resonator unit mounting bolt (4),
- the air resonator unit (5).
Disconnect:
- the brake servo vacuum pipe at the air distributor
end,
- the ignition coil connectors,
- the throttle valve connector.
Disconnect the air temperature sensor (6).
Unclip the engine wiring harness (7).
Unclip the petrol vapour recirculation pipe (8).
Loosen the air filter box mountings, without removing
it from the engine compartment.
101103
WARNING
Do not damage the vacuum outlet on the air dis-
tributor. If it is damaged, the air distributor will
have to be replaced.
4
5
101100
101488
7
6
8
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