Renault Laguna III, Manual

Page: 1211 / 3699

14A
-
10
ANTIPOLLUTION
Fuel vapour absorber: Check
F4R or M4R
14A
I - PREPARATION OPERATION FOR CHECK
a
Raise the rear bench seat.
a
Open the “pump - sender - filter” module access flap.
II - CHECKING THE FUEL VAPOUR ABSORBER
a
On the fuel vapour absorber, plug the circuit coming
from the fuel tank.
a
Connect a pressure gauge of the (Mot. 1311-01)
onto the fuel vapour absorber breather outlet.
a
With the engine at idle speed, check that no vacuum
is present at the fuel vapour absorber breather out-
let. The control value read by the
Diagnostic tool in
parameter « fuel vapour absorber bleed solenoid
valve OCR » remains at least
X less than or equal
to 1.5 % .
Is there a vacuum?
- YES:with the ignition off, use a vacuum pump to
apply a vacuum of 500 mbar to the solenoid valve
outlet. The vacuum pressure should not vary by
more than
10 mbar over 30 seconds .
Does the pressure vary?
Yes: the solenoid valve is faulty, replace the sole-
noid valve.
No: there is an electrical problem, check the circuit.
- NO: under bleed conditions (see 14A , Antipollu-
tion , Fuel vapour recirculation circuit: Check ,
page 14A-8 ) the vacuum must be increased. In the
same time, the value of the parameter on the Diag-
nostic tool increases.
III - CHECKING THE FUEL VAPOUR ABSORBER-
TANK CONNECTION
a
Check this connection by connecting a vacuum
pump to the pipe leading to the fuel vapour absorb-
er.
IV - FINAL OPERATION.
a
Close the “pump - sender - filter” module access
flap.
a
Refit the rear bench seat.
Special tooling required
Mot. 1311-01 Pressure gauges and petrol
pressure measuring unions.
Equipment required
Diagnostic tool
IMPORTANT
During this operation, be sure to:
- refrain from smoking or bringing red hot objects
close to the working area,
- be careful of fuel splashes when disconnecting the
union.
IMPORTANT
Wear latex gloves during the operation.
IMPORTANT
Wear goggles with side protectors for this opera-
tion.
WARNING
To avoid any corrosion or damage, protect the
areas on which fuel is likely to run.
WARNING
Keep the pipe unions away from contaminated
areas.
WARNING
To prevent impurities from entering the circuit, place
protective plugs on all fuel circuit components
exposed to the open air.