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 |
•
Deviation of Long Term Fuel Trim Monitoring | 1. Poor Connector Connection 2. Air leakage or restriction in Intake or Exhaust System 3. Defected Downstream O2 Sensor 4. Defected Three-Way Catalyst Converter |
Enable Conditions |
•
Canister Purge not in RAMP_OPEN(Canister Load learning)
•
Downstream O2 Sensor Trim I-control active
•
Battery voltage higher than 11V and lower than 16V
•
No relevant DTC present | |
Threshold Value |
•
Trim Value(Lambda Value) less than -0.05 | |
Diagnostic Time |
•
60 sec. | |
MIL On Condition |
•
2 Driving Cycle |
