The ECM/PCM sets DTC P2237 when the conditions are like below.
- The fuel factor change is higher than 0.1 when the sensor voltage is 1.49~1.5V
- Integrated air mass flow value is higher than threshold value when the sensor voltage is 1.49~1.5V
- The fuel cut is being kept when the sensor voltage is lower than 0 V.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical check | 1. Poor connection 2. Open power/ground in signal circuit 3. HO2S(S1) |
Enable Conditions |
•
Sensor pump current valid (same as the conditions of P0133)
•
11V < Battery voltage < 16V | |
Threshold Value |
•
Sensor signal stuck at lambda=1 or Upstream O2 sensor voltage < 2.1V during fuel cut off | |
Diagnostic Time |
•
15sec | |
MIL On Condition |
•
2 driving cycles |
