3-34 ENGINE CONTROL SYSTEM
O
2
FEEDBACK SYSTEM
After extended usage, engine components may become deteriorated or worn out.
This might make the A/F (air / fuel mixture ratio) incorrect which could affect exhaust emissions. To correct the
A/F, an O
2
sensor must be temporally installed in the exhaust manifold. This sensor is used to measure the
concentration of oxygen in the exhaust gas at engine speeds of 2000, 3000 and 4000 r/min.
The ECM uses the input data from the O
2
sensor to correct the compensation coefficient of the fuel injection
duration map within the ECM itself.
NOTE:
For fuel mixture check (O
2
feedback) operation procedure, refer to “Suzuki Diagnostic System Operation
Manual”.
O
2
sensor :
Informs ECM of concentration of oxygen in exhaust gas.
ECM
Feedback
\ 18213-74F00 : O
2
sensor
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