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G 1.0 SOHC > Engine > Unleaded EOBD > P2096 Post Catalyst Fuel Trim System Too Lean (Bank 1) > General Information" style="margin: 0px; padding: 0px; outline: none; position: relative; z-index: 940;">2008 > G 1.0 SOHC > Engine > Unleaded EOBD > P2096 Post Catalyst Fuel Trim System Too Lean (Bank 1) > General Information
COMPONENT LOCATION
GENERAL DESCRIPTION
In order to control the emission of the CO, HC and NOx components of the exhaust gas, a heated oxygen sensor (HO2S), mounted on the front side and rear side of the catalytic converter, detects the oxygen content in the exhaust gas. The front HO2S signal is used to control air/fuel ratio (closed loop fuel control) and the rear HO2S signal is used to monitor front HO2S and catalyst for proper operation.
The HO2S requires a minimum temperature to operate properly and provide a closed loop fuel control system. So the HO2S contains a heater element to reduce warm-up time and ensure proper performance during all driving conditions, which allows for closed loop fuel control or catalyst monitoring immediately upon engine start-up. The ECM controls this heater element by duty cycle. The main relay supplies voltage to the heater and the ECM provides a ground circuit for activating the heater.
DTC DESCRIPTION
The ECM monitors the trim of lambda control by the rear HO2S signal in addition to the HO2S monitoring. The trim value calculation is based on the difference of rear HO2S signal from desired value. The ECM sets DTC P2096 if either trim value or the difference of rear HO2S from desired value is reached to the maximum threshold.
If the same error code is set in the next driving cycle, the ECM illuminates the MIL.
DTC DETECTING CONDITION
ItemDetecting ConditionPossible Cause
DTC Strategy● Signal check,High● Contact resistance in connections
● Exhaust System
● Faulty Catalytic converter
● Faulty HO2S(UP)
Enable Conditions● Dew point end detected
● Target lambda = 1
● Battery voltage > 10.7V
● Exhaust gas temperature (model) : 600°C ~ 800°C
● No upstream O2 sensor error or downstream O2 sensor ready
● 1800 rpm < Engine speed < 3400 rpm
● Engine load : 22.5~65.3%
Threshold Value● Second lambda controller from downstream lambda control > 1.2 s
Diagnostic Time● 20 sec
MIL ON Condition● 3 driving cycle
SIGNAL WAVEFORM
The amplitude of the signal output of the rear HO2S is small compared to the front HO2S because the rear HO2S detects emission gas purified by the catalytic converter. This is the normal signal waveform of the rear HO2S at idle.
