If the lambda controller reaches the maximum or minimum threshold, then feedback control is no longer possible and emissions will be increased. The 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. 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 |
