ECM/PCM shows P2237 when the conditions are like below.
- Deviation of average correction value of fuel ratio is higher than 0.1 when sensor voltage is 1.49~1.5V
- Accumulated air mass flow value is higher than threshold value when target lambda is 0.97 or 1.03
- Upstream O2 sensor displays 0V below when the fuel cut is being kept over 3 minutes.
Item | Detecting Condition | Possible Cause | |
DTC Strategy | Case 1 |
•
Pumping Current Circuit Check | 1. Poor connection 2. Open or short power/ground in signal circuit 3. S1 |
Case 2 |
•
Activation Check | ||
Case 3 |
•
Plausibility Check | ||
Enable Conditions | Case 1 |
•
Closed loop control "ON"
•
Fuel factor change is higher than 0.1 | |
Case 2 |
•
Target Lamda is lower than 0.97 or higher than 1.03
•
Integrated Mass Flow is higher than 0.3kg | ||
Case 3 |
•
Fuel Cut | ||
Threshold value | Case 1 |
•
Sensor voltage is at 1.49~1.51V | |
Case 2 |
•
Sensor voltage is at 1.49~1.51V | ||
Case 3 |
•
Sensor voltage is lower than 0V | ||
Diagnosis Time |
•
Immediate | ||
MIL On Condition |
•
2 Driving Cycle | ||
