Logan X90, Сборка

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17B - 31
PETROL INJECTION
Special notes on the system (when driving)
L90, and K7J, and 710 – L90, and K7M, and 710
17B
FOR VEHICLES FITTED WITH O.B.D:
How the O.B.D. fault finding system works: when a fault
causing excessive pollution is detected, an instrument
panel warning light comes on (O.B.D warning light),
and tells the driver that he needs to have his vehicle re-
paired.
The fault finding strategies dealt with by the On Board
Diagnostic system are:
- electrical fault finding,
- misfire fault finding,
- upstream oxygen sensor operational fault finding,
- catalytic converter fault finding.
Electrical fault finding and misfire fault finding are car-
ried out continuously.
Upstream oxygen sensor operational fault finding and
catalytic converter fault finding are carried out only
once while the vehicle is being driven, provided that the
necessary fault finding conditions are met:
- air/coolant temperature conditions,
- speed condition (range of values),
- engine conditions (manifold pressure, speed, range of
values and stability),
- delay since start.
The OBD management program supplements the ma-
nagement of conventional electrical breakdowns. To
meet this standard the requirements are:
- lighting up of the OBD warning light (or, for some
faults, causing to it flash),
- storing OBD faults.
IMPLICATIONS FOR FAULT FINDING AND
REPAIRS
Special care is required when working on the vehicle to
prevent the O.B.D. warning light from switching on after
the vehicle has been returned to the customer.
Some faults only appear while driving, when the adap-
tives have been programmed. Confirmation of the re-
pair is therefore essential.
WARNING
At the end of each test, it is essential that the igni-
tion is not switched off before the result is read on
the diagnostic tool. Switching off the ignition will
lead to the results being misinterpreted.
Note:
All electrical faults which result in exceeding the pol-
lution limit cause the On Board Diagnostic warning
light to come on.