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CITROEN C4 Handbook page 90

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ELECTRONIC STABILITY
PROGRAMMES
Electronic Stability Programme
(ESP) and Traction Control (ASR)
These systems are closely con-
nected to the ABS and additional
to it. Where a difference is detected
between the trajectory followed by
the vehicle and that wanted by the
driver, the ESP system acts au-
tomatically on the brake of one or
more wheels to return the vehicle to
the trajectory wanted, within the lim-
its of the laws of physics. The ASR
system optimises traction and pre-
vents wheel spin by acting on the
brakes of the driving wheels. It also
improves steering stability during
acceleration.
VIII
Operation
When either the ESP or ASR sys-
tem
is
brought
the ESP/ASR warning lamp flashes.
86
Deactivation
In exceptional conditions (vehicle
stuck in snow, soft ground, etc.) it
may prove useful to deactivate the
ESP/ASR system to allow the wheels
to spin and thus regain traction.
Press on control A, the ESP/ASR
warning lamp and the control light
up. The ESP/ASR systems are no
longer active.
The ESP/ASR systems will activate
again:
- Automatically after the ignition
has been switched off.
- Automatically when you drive at
above approx. 30 mph.
- Manually with another press on
controlA.
Operational anomaly
If there is a system malfunction, the
ESP/ASR warning lamp comes on.
Contact CITROËN to have the sys-
tem checked.
into
operation,
S A F E T Y
SAFETY RECOMMENDATIONS
The ESP system offers increased
driving safety but is not in place to
encourage the driver to take addi-
tional risks or to drive at excessive
speeds.
The functioning of this system is sub-
ject to compliance with the manufac-
turer's recommendations on wheels
(tyres and rims), brake parts and elec-
tronic components, as well as with
CITROËN's assembly and repair pro-
cedures.
After any collision, have this system
checked by a CITROËN dealer.

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