sensor VOLVO 240 1990 Owners Manual

Volvo 1990 240 Model

A self-diagnostic system incorporated in the sensor monitors the SRS. If\
a fault is detected, the "SRS"
warning light will illuminate. the light is included in the warning/indi\
cator light cluster in the instrument
panel. Normally, the SRS warning light will be illuminated along with th\
e other warning/indicator lights
when the ignition key is turned to the ON position (position II), and \
go out a short time after the engine
has been started. Check that this light is functioning properly every ti\
me the car is started.

The following items are monitored by the diagnostic system:
l Sensor unit electronics integrity.
l Reserve energy supply.
l Diagnostic output circuit.
l System voltage.
l Integrity of system connectors.
l Mercury switch closure.
l Gas generator ignitor
WARNING! If the SRS warning light stays on after the engine has started \
or if it comes on while you
are driving, drive the car to the nearest authorized Volvo Dealer for in\
spection as soon as possible.
ATTENTION! SRS VEHICLE!
THIS CAR IS EQUIPPED WITH A SUPPLEMENTAL RESTRAINT SYSTEM. TO PROVIDE
CONTINUED RELIABILITY, CERTAIN ELEMENTS OF THE SUPPLEMENTAL RESTRAINT
SYSTEM SHALL BE SERVICED OR REPLACED BY 1999. SEE OWNERS MANUAL FOR
FURTHER INFORMATION.
VOLVO

There is no maintenance to perform on the SRS yourself. The only periodi\
c maintenance recommended
on the SRS is that the air bag module and the sensor unit should be repl\
aced every ten years and that the
other components in the system (wiring, connectors, etc.) should also \
be inspected at this time. This
service must be performed by an authorized Volvo dealer.
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Volvo 1990 240 Model

1 Data plate
2 Oil filler cap, engine
3 Oil dipstick, engine
4 Brake fluid reservoir
5 Washer fluid reservoir
6 Expansion tank, coolant
7 Battery
8 Oil reservoir, power steering
9 Fuse, engine control pg. 60 Fuel requirements
Unleaded Fuel

Each Volvo has a catalytic converter and must use only unleaded gasoline\
(as specified on the
instrument panel and by a label near the filter inlet). U.S. and Canadi\
an regulations require that pumps
delivering unleaded gasoline be labeled "UNLEADED". Only these pumps hav\
e nozzles which fit your
car's filler inlet. It is unlawful to dispense leaded fuel into a vehicl\
e labelled "unleaded gasoline only".

Leaded gasoline damages the catalytic converter and the oxygen sensor sy\
stem. Repeated use of leaded
gasoline will lessen the effectiveness of the emission control system an\
d could result in loss of emission
warranty coverage. State and local vehicle inspection programs will make\
detection of misfueling easier,
possibly resulting in emission test failure for misfueled vehicles.

Octane Rating

Volvo recommends the use of premium unleaded gasoline with an (R+M)/2 \
rating of 91. This is
generally equivalent to a Research Octane Number (RON) of 95 or higher\
.

Deposit Control Gasolines

Volvo recommends the use of gasolines that contain "Deposit Control" add\
itives. These additives are
specially formulated to prevent the build up of certain injector and int\
ake system deposits. Fuels
containing "Deposit Control" additives are usually advertised as contain\
ing them and may have
additional claims to "clean injectors and intake valves" or similar word\
ing.
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Volvo 1990 240 Model
complete unit.
Replace more frequently if contaminated fuel was introduced into the tan\
k.

Fuel system cap, tank, lines and connections

The ability of the fuel system to control hydrocarbon emissions is depen\
dent largely on a leak-free
system. Check for proper sealing of gasoline filler cap which contains "\
O"-ring type seals. Check all
evaporative hoses in vehicle for tightness. Check fuel lines under vehic\
le. Repair if necessary.

Air cleaner

Replace the air cleaner cartridge every 30,000 miles (48,000 km). The \
cartridge should be replaced more
often when driving under dirty and/or dusty conditions.
The filter cannot be cleaned and should always be replaced with a new on\
e.

Checking and adjusting idle speed

Your Volvo is equipped with an electronically controlled idle speed syst\
em that requires no period
checking or adjustment.

Lamda-sond (oxygen sensor) system

This is an emission control system designed to reduce emissions and impr\
ove fuel economy. An oxygen
sensor monitors the composition of the exhaust gases leaving the engine.\
The exhaust gas analysis is fed
into an electronic unit which continuously influences the amount of fuel\
injected. This adjusts the air-
fuel ratio to provide optimum conditions for combustion and efficient re\
duction of the three major
pollutants (hydrocarbons, carbon monoxide and nitrogen oxides) through\
a 3-way catalytic converter. pg. 67 Servicing
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Volvo 1990 240 Model


Oxygen Sensor

On the B230F engines, the oxygen sensor (Lambda-sond) is electrically \
heated. The use of a PTC
(Positive Temperature Coefficient) element to heat the Lambda-sond ens\
ures a shorter warm up time
and continuous operation at its working temperature.
This type of Lambda-sond does not require periodic replacement.

Catalytic Converter

This is a supplementary device in the exhaust system, designed to reduce\
exhaust emissions.
This device is mainly a container with a ceramic material insert, design\
ed to let the exhaust gases pass
through channels in the insert. The channel walls are covered by a thin \
layer of platinum and rhodium.
These metals act as catalysts, permitting a chemical action to occur wit\
hout actually taking part in it.
The carbon monoxide content will increase if the Catalytic Converter is \
damaged.
CAUTION:
Vehicles with Catalytic Converter must use unleaded fuel only. Otherwise\
the Catalytic Converter will
become damaged and ineffective.

Torque catalytic converter mounting bolts

The Catalytic Converter mounting bolts should be re-torqued at the 600-1\
,200 mile (1000-2000) km
inspection.
pg. 68 Servicing
Engine Crankcase Ventilation System
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