Fuel/Emissions Systems - Volvo S40 Operation Manual

2000 Volvo S & V 40
19 Chassis number
A ABS
B Air conditioning compressor
C Condenser, air conditioning
D Accumulator, air conditioning
WARNING!
The coolant fan may start or continue to operate (for up to 6 minutes) after the engine has been
switched off.
pg. 110 Fuel/emissions systems
Fuel system
The fuel system is allelectronic and is microprocessorcontrolled. It can continually compensate for
variation in engine load, speed and temperature to give the best economy and power. A mass air flow
sensor measures the inducted air. In this way the system can make instantaneous adjustments for
changes in air temperature or density, thus always assuring the best economy with the lowest possible
exhaust emissions.
Heated oxygen sensor
This is an emission control system designed to reduce emissions and improve fuel economy. The heated
oxygen sensor monitors the composition of the exhaust gases leaving the engine. The exhaust gas
analysis is fed into an electronic module. This adjusts the airfuel ratio to provide optimum conditions for
combustion and efficient reduction of the three major pollutants (hydrocarbons, carbon monoxide and
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