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(11) Wide band oxygen sensor control
A. Overview
For diesel engine, combustion is not performed at the optimum (theoretically correct) air-fuel ratio
and the oxygen concentration is thin in most cases. So the wide-band oxygen sensor is used for
this kind of engine, and this sensor is a little different from the one that used for gasoline engine.
The combustion in diesel engine is controlled by fuel injection volume. Therefore, the wide band
oxygen sensor should be used in diesel engine. This sensor measures the air-fuel ratio in very
wide range, and is also called full range oxygen sensor.
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The wide band oxygen sensor measures the oxygen density in exhaust gas and sends it to
ECU to control the EGR more precisely.
B. Components
Oxygen sensor
HFM (intake air
temperature)
Coolant
temperature sensor
Injector (C3I)
E-EGR valve
CDPF
Electric throttle
body
D20DTR ECU
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Troubleshooting
