14A
-
4
ANTIPOLLUTION
Fuel vapour canister:Checking
K7J or K7M, and 710
14A
CHECKING THE FUEL VAPOUR
ABSORBER
On the fuel vapour absorber, plug the circuit coming
from the fuel tank.
Connect the pressure gauge of tool (Mot. 1311-01)
to absorber breather outlet (1).
With the engine at idle speed, check that no vacuum
is present at the absorber breather outlet. Under the
same conditions, the control value read by the dia-
gnostic tool in parameter: PR023 « canister bleed
solenoid valve OCR » remains minimal (lower than
or equal to 3 %.
Is there a vacuum?
- If so: 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 fuel
vapour absorber (the solenoid valve is integrated
in the fuel vapour absorber).
• No: there is an electrical fault, check the circuit.
- If not: under the conditions required for bleeding
(see 14A, Antipollution, Fuel vapour rebrea-
thing), the vacuum pressure should increase (the
value of parameter: PR023 « canister bleed sole-
noid valve OCR » on the diagnostic tool should
increase at the same time).
CHECKING THE FUEL VAPOUR
ABSORBER TANK CONNECTION
Check this connection by connecting a vacuum
pump to the pipe going to the absorber.
Essential special tooling
Mot. 1311-01
Fuel pressure pres-
sure gauges and soc-
ket unions
Essential equipment
diagnostic tool
108415
1