The linear O2 sensor is mounted on the front side of the Catalytic Converter (warm-up catalytic converter) or in the front exhaust pipe. It detects a wide range of air/fuel ratios in the exhaust gas from the rich to lean regions. This linear O2 sensor produces a current that corresponds to a specific air/fuel ratio. The PCM monitors this signal and determines whether the air/fuel mixture is rich or lean. The PCM constantly monitors the linear O2 sensor and increases or decreases the fuel injection duration using this signal. This is called closed-loop fuel control operation.
If the HO2S signal voltage is fixed at lean status, then feedback control is no longer possible, the PCM sets DTC P2195.
Item | Detecting Condition | Possible cause |
DTC Strategy |
–
Characteristic line strong shift | 1. Poor connection or damaged harness 2. Front HO2S |
Enable Conditions |
–
Wide range sensor pump current valid
–
Downstream O2 sensor operative readiness
–
Active test not activated
–
ngine speed ＞ 600rpm
–
Mass air flow ＜ 83g/sec(300kg/h)
–
572 F(300℃) ＜ Exhaust gas temperature ＜ 1472 F (800℃) | |
Threshold value |
–
Plausibility between upstream and downstream
–
Upstream lean & downstream rich & lambda controller limit or upstream rich & downstrean lean & lambda controller limit | |
Diagnosis Time |
–
Less than 1300 sec. | |
MIL On Condition |
–
2 driving cycle |
