If the lambda controller reaches the maximum or minimum threshold, then feedback control is no longer possible and emissions will be increased. The ECM/PCM sets DTC P2097 if no proportional post catalyst fuel trim adaptation occurs for a defined time after the lambda controller has reached its minimum threshold.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
O2 sensor characteristic line shift | 1. Catalyst converter 2. HO2S(S1) 3. ECM/PCM |
Enable Conditions |
•
Dew point end detected
•
Fuel feed back control active
•
Battery voltage is higher than 11V
•
Exhaust Gas temperature is higher than 280°C and lower than 800°C
•
No injector error
•
No upstream O2 sensor heater error
•
No catalyst error detected
•
No misfire occurred | |
Threshold Value |
•
I-portion of lambda controller value by downstream O2 sensor is lower than -0.028 | |
Diagnostic Time |
•
15 sec | |
MIL On Condition |
•
3 driving cycle |
