2021 CITROEN C5 AIRCROSS check engine

186
Load reduction mode
System which manages the use of certain
functions according to the level of charge
remaining in the battery.
When the vehicle is being driven, the load
reduction function temporarily deactivates
certain functions, such as air conditioning,
heated rear screen, etc.
The deactivated functions are reactivated
automatically as soon as conditions permit.
Snow chains
In wintry conditions, snow chains
improve traction as well as the
behaviour of the vehicle when
braking.
Snow chains must be fitted only to the
front wheels. They must never be fitted to
"space-saver" type spare wheels.
Take account of the legislation in force in
your country on the use of snow chains
and the maximum authorised speed.
Installation tips
F If you have to fit the chains during a journey,
stop the vehicle on a flat sur face on the side
of the road.
F

A
pply the parking brake and position any
wheel chocks under the wheels to prevent
movement of your vehicle.
F

F
it the chains following the instructions
provided by the manufacturer.
F

M
ove off gently and drive for a few
moments, without exceeding 31
mph
(50


km/h).
F

S
top your vehicle and check that the snow
chains are correctly tightened.
Energy economy mode
System which manages the duration of use of
certain functions to conser ve a sufficient level of
charge in the battery.
After switching off the engine and for a
maximum
cumulative period of around 40
minutes, you can
continue to use functions such as the audio and
telematics system, the wipers, the dipped beam
headlamps, the courtesy lamps, etc.
Switching to this mode
A message appears in the instrument panel
screen indicating that the vehicle has switched
to economy mode and the active functions are
put on standby.
If a
telephone call is being made at this
time, it will be maintained for around
10
minutes with the Bluetooth hands-free
system of your audio system.
Exiting the mode
These functions will be automatically
reactivated the next time the vehicle is used.
In order to restore the use of these functions
immediately, start the engine and let it run:
-

f
or less than 10 minutes, to use the
equipment for approximately 5


minutes,A flat battery prevents the engine from
starting.
For more information on the 12
V batter y
,
refer to the corresponding section.
-
f
or more than 10 minutes, to use the
equipment for approximately 30

minutes.
Let the engine run for the duration specified to
ensure that the battery charge is sufficient.
Do not repeatedly and continuously restart the
engine in order to charge the battery.
Practical information

189
F Lift the safety catch and raise the bonnet.
F
U
nclip the stay from its housing and place it
in the support slot to hold the bonnet open.
Closing
F Take the stay out of the support slot.
F C lip the stay in its housing.
F

L
ower the bonnet and release it near the
end of its travel.
F

P
ull on the bonnet to check that it is locked
c o r r e c t l y.
Because of the presence of electrical
equipment under the bonnet, it is
recommended that exposure to water
(rain, washing, etc.) be limited.
Engine compartment
These engines are examples provided as
a guide.
The locations of the following elements may vary:
-

A
ir filter.
-

E
ngine oil dipstick.
-

E
ngine oil filler cap.
-
P

riming pump.
-
D

egassing screw.
Petrol engine
Diesel engine
1. Screenwash fluid reservoir.
2. Engine coolant reservoir.
3. Brake fluid reser voir.
4. Battery/Fuses. The Diesel fuel system operates under
very high pressure.
All work on this circuit must be carried out
only by a
CITROËN dealer or a qualified
workshop.
5.
Remote earth point (-).
6. Fusebox.
7. A i r f i l t e r.
8. Engine oil filler cap.
9. Engine oil dipstick.
10. Priming pump*
11. Degassing screw*.
*
D
epending on engine.
Checking levels
Check all of the following levels regularly in
accordance with the manufacturer's service
schedule. Top them up if required, unless
otherwise indicated.
If a
level drops significantly, have the
corresponding system checked by a
CITROËN
dealer or a
qualified workshop.
The fluids must comply with the
manufacturer's requirements and with the
vehicle's engine.
7
Practical information

190
Check using the dipstick
The location of the dipstick is shown in the
corresponding underbonnet layout view.
F
T
ake the dipstick by its coloured grip and
pull it out completely.
F

W
ipe the end of the dipstick using a clean,
non-fluffy cloth.
F

R
efit the dipstick and push fully down, then
pull it out again to make the visual check:
the correct level is between marks A and B .A = MA X
B = MIN
Oil grade
Before topping up the oil or changing
the oil, check that the oil is the correct
grade for your engine and conforms to the
manufacturer's recommendations.
Topping up the engine oil level
The location of the oil filler cap is shown in the
corresponding underbonnet layout view.
F
A
dd oil in small quantities, avoiding any
spills on engine components (risk of fire).
Do not star t the engine if the level is:
-

A
bove mark A
, then contact a CITROËN
dealer or a qualified workshop.
-
B
elow mark B
, then top up the engine oil
immediately.
Take care when working under the bonnet,
as certain areas of the engine may be
extremely hot (risk of burns) and the
cooling fan could start at any time (even
with the ignition off).
Used products
Avoid prolonged contact of used oil or
fluids with the skin.
Most of these fluids are harmful to health,
and may be very corrosive.
Do not discard used oil or fluids into
sewers or onto the ground.
Empty used oil into the containers
reser ved for this purpose at a
CITROËN
dealer or a
qualified workshop.
Engine oil
The level is checked either using the
oil level indicator in the instrument
panel when the ignition is switched
on, for vehicles equipped with an
electric gauge, or using the dipstick.
The vehicle must be parked on a level sur face,
w ith the engine stopped for more than 30 minutes.
It is normal to top up the oil level between two
ser vices (or oil changes). It is recommended
that you check the level, and top up if
necessary, every 3,000
miles (5,000 km).
In order to maintain the reliability of the
engine and emissions control system,
never use additives in the engine oil.
Practical information

191
During the 30 minutes after topping up the
o il, the check per formed with the oil level
indicator in the instrument panel when the
ignition is switched on is not valid.
Brake fluid
The level of this fluid should be close
to the " MAX" mark. If not, check the
brake pad wear.
To know how often the brake fluid should be
replaced, refer to the manufacturer's servicing
schedule.
Engine coolant
Check the engine coolant level
regularly.
It is normal to top up this fluid
between two services. The check and top-up must only be done with
the engine cold.
A low level presents a
risk of serious damage
to the engine.
The level of this fluid should be close to the
" MAX " mark but should never exceed it.
If the level is close to or below the " MIN" mark,
it is essential to top up.
When the engine is hot, the temperature of this
fluid is regulated by the fan.
In addition, as the cooling system is
pressurised, wait at least one hour after
switching off the engine before carrying out any
work.
To avoid the risk of scalding if you need to top
up in an emergency, wrap a cloth around the
cap and unscrew the cap by two turns to allow
the pressure to drop.
Once the pressure has dropped, remove the
cap and top up to the required level.
If topping up, clean the cap before
replacing it. Use only DOT4 brake fluid
from a sealed canister.
F

W

ait a
few minutes before checking the
level again using the dipstick.
F

A

dd more oil if necessary.
F

A

fter checking the level, carefully refit the oil
filler cap and the dipstick in its tube.
Cooling of the engine when stopped
The engine cooling fan may star t after
the engine has been switched off.
Take care with objects or clothing that
could be caught in the blades of the
fan!Screenwash fluid
Top up to the required level when
necessary.
Fluid specification
The screenwash fluid must be topped up with
a ready for use mix.
In winter (temperatures below zero), a liquid
containing an anti-freeze agent must be
used which is appropriate for the prevailing
conditions, in order to preser ve the elements of
the system (pump, tank, ducts, etc.).
Filling with pure water is prohibited
under all circumstances (risk of freezing,
limestone deposits, jets, etc.).
Diesel fuel additive (Diesel
with particle filter)
or The minimum level in the particle
filter additive tank is indicated by fixed
illumination of this warning lamp,
accompanied by an audible warning
and a
message warning that the level
of additive is too low.
To p p i n g u p
This additive must be topped up without delay
by a CITROËN dealer or a qualified workshop.
7
Practical information

192
Versions equipped with Stop & Start are
fitted with a 12 V lead-acid battery of
specific technology and specification.
Its replacement should be carried out
only by a
CITROËN dealer or a qualified
workshop.
Cabin filter
Depending on the environment and
the use of the vehicle (e.g. dusty
atmosphere, city driving), change it
twice as often if necessar y .A clogged cabin filter may have an
adverse effect on the per formance of
the air conditioning system and generate
undesirable odours.
Air filter
Depending on the environment and
the use of the vehicle (e.g. dusty
atmosphere, city driving), change it
twice as often if necessar y
.
Oil filter
Change the oil filter each time the
engine oil is changed.
Particle filter (Diesel)
or The start of saturation of the particle
filter is signalled by the temporary
illumination of this warning lamp,
accompanied by a
message warning
of the risk of the filter clogging up.
As soon as the traffic conditions permit,
regenerate the filter by driving at a
speed of at
least 37
mph (60 km/h) until the warning lamp
goes off.
AdBlue (BlueHDi)
An alert is triggered once the reser ve level is
reached.
For more information on the AdBlue range
indicators , refer to the corresponding section.
To avoid the vehicle being immobilised as per
regulations, you must top up the AdBlue tank.
For more information on the Supply of
AdBlue , refer to the corresponding section.
Checks
Unless otherwise indicated, check these
components in accordance with the
manufacturer's service schedule and according
to your engine.
Other wise, have them checked by a
CITROËN
dealer or a
qualified workshop.
Only use products recommended by
CITROËN or products of equivalent quality
and specification.
In order to optimise the operation of
components as important as those in the
braking system, CITROËN selects and
offers very specific products.
12 V battery
The battery does not require any maintenance.
However, check regularly that the terminals
are correctly tightened (versions without quick
release terminals) and that the connections
are clean.
For more information on the precautions to
take before any work on the 12 V batter y,
refer to the corresponding section.
Practical information

194
Headlamps and lamps
The headlamps have polycarbonate
lenses with a protective coating.
Do not clean them with a
dry or abrasive
cloth, nor with detergent or solvent
products.
Use a
sponge and soapy water.
The use of a
high pressure jet wash for
cleaning the headlamps, lamps and their
surrounds may damage the lacquer and
seals.
Observe the recommendations on
pressure and distance for jet washing.
First clean persistent stains with a
sponge
and warm soapy water.
Leather
Leather is a natural product. Appropriate
regular care and cleaning is essential for its
durability.
Refer to your vehicle's Maintenance and
Warranty guide for information on all the
special precautions to observe.
AdBlue® (BlueHDi)
To respect the environment and ensure
compliance with the Euro 6 standard, without
adversely affecting the per formance or fuel
consumption of Diesel engines, CITROËN
has taken the decision to equip its vehicles
with a
system that associates SCR (Selective
Catalytic Reduction) with a
Diesel particle filter
(DPF) for the treatment of exhaust gases.
SCR system
Using a liquid called AdBlue® that contains
urea, a catalytic converter turns up to 85% of
the nitrogen oxides (NOx) into nitrogen and
water, which are harmless to health and the
environment.
The AdBlue
® is contained in
a
special tank holding about
17


litres.
Its capacity allows a

driving range of
approximately 5,600

miles (9,000 km), highly
dependent on your driving style.
An alert system is triggered automatically once
the reser ve level is reached: you can then drive
for a

further 1,500

miles (2,400 km) before the
tank is empty.
Driving with under-inflated tyres increases
fuel consumption. Non-compliant tyre
pressure causes premature wear on tyres
and has an adverse effect on the vehicle's
road holding – risk of an accident!
Driving with worn or damaged tyres reduces
the braking and road holding per formance of
the vehicle. It is recommended to regularly
check the condition of the tyres (tread and
sidewalls) and wheel rims as well as the
presence of the valves.
Using different size wheels and tyres from
those specified can affect the lifetime of
tyres, wheel rotation, ground clearance, the
speedometer reading and have an adverse
effect on road holding.
Fitting different tyres on the front and rear axles
can cause the ESC to mistime.
Advice on care and maintenance
Recommendations on the care and
maintenance of your vehicle are given in the
Maintenance and Warranty Guide.
Practical information

196
Access to the AdBlue® tank
A blue cap under the fuel filler flap indicates
access to the AdBlue® tank.
F

S

witch off the ignition and remove the key.
Or
F

W

ith Keyless Entry and Starting, press the
" START/STOP " button to switch off the
engine.
F

T

urn the AdBlue
® blue filler cap anti-
clockwise.
F

O

btain an AdBlue
® container (check the
use-by date) and pour the contents of the
container into your vehicle's AdBlue
® tank.
Or
F

I

nsert the AdBlue
® pump nozzle and refill
the tank until the nozzle stops automatically. Important:
To avoid over flowing the AdBlue
® tank, it
is recommended:
F

T

o top up between 10

and 13

litres
using AdBlue
® containers.
Or
F

W

hen filling at a ser vice station, to stop
after the third automatic cut-off of the
nozzle.
Important: in the event of a
top-up after
a

breakdown because of a lack of
AdBlue, you must wait around 5
minutes
before switching on the ignition, without
opening the driver's door, unlocking
the vehicle, introducing the key into
the ignition switch, or introducing
the key of the Keyless Entr y and
Star ting system into the passenger
compartment .
Switch on the ignition, then wait for
10


seconds before starting the engine.
Keep AdBlue
® out of the reach of children,
in its original container or bottle.
Procedure
Before starting the top-up procedure, ensure
that the vehicle is parked on a flat and level
sur face.
Do not pour AdBlue
® if the temperature of the
vehicle is less than -11°C. Park your vehicle in
a

warmer area for a

few hours to allow the top-
up to be carried out.
In the event of an AdBlue
® breakdown,
confirmed by the message "Add AdBlue:
Starting impossible", you must top up with
at least 5

litres.
Never pour AdBlue
® into the Diesel fuel
tank.
If any AdBlue
® is splashed, or if there
are any spillages on the bodywork, rinse
immediately with cold water or wipe with
a

damp cloth.
If the fluid has crystallised, clean it off
using a

sponge and hot water.
Practical information

216
(+) Positive terminal.
It has a quick-release clamp.
(-) Negative terminal.
As the battery's negative terminal is not
accessible, a remote earth point is placed near
the battery.
Starting using another
battery
When your vehicle's battery is discharged, the
engine can be started using a backup battery
(external or from another vehicle) and jump
leads or using a
battery booster.
For access to the (+) terminal:
F

u
nlock the bonnet by activating the internal
release lever, then the external safety catch.
F
r
aise the bonnet.
Never start the engine by connecting
a battery charger.
Never use a 24 V or higher battery
b o o s t e r.
Check beforehand that the backup
battery has a nominal voltage of 12 V and
a capacity at least equal to that of the
discharged battery.
The two vehicles must not be in contact
with each other.
Switch off all the electrical consumers
on both vehicles (audio system, wipers,
lighting, etc.).
Make sure that the jump leads are not
close to the moving parts of the engine
(fan, belt, etc.).
Do not disconnect the (+) terminal while
the engine is running. F
C
onnect the red cable to the (+) terminal of
flat battery A (at the metal elbow), then to
the (+) terminal of backup battery B or the
b o o s t e r.
F
C
onnect one end of the green or black
cable to the (-) terminal of backup battery
B or the booster (or to an earth point on the
assisting vehicle).
F
C
onnect the other end of the green or black
cable to earth point C on the broken down
vehicle.
F
L
ift the plastic cover on the (+) terminal, if
your vehicle has one. F

S
tart the engine of the assisting vehicle and
leave it running for a few minutes.
F
O
perate the starter on the broken down
vehicle and let the engine run.
If the engine does not start straight away,
switch off the ignition and wait a few moments
before trying again.
F
W
ait for it to return to idle.
F
D
isconnect the jump leads in reverse
order .
F
R
efit the plastic cover to the (+) terminal, if
your vehicle has one.
F A llow the engine to run for at least
30 minutes, by driving or with the vehicle
stationary, so that the battery reaches an
adequate state of charge.
If your vehicle has an automatic gearbox,
never try to start the engine by pushing
the vehicle.
In the event of a breakdown