The ECM/PCM monitors front HO2S signal level during fuel cut-off to check plausibility. The ECM/PCM sets DTC P2297 if front HO2S signal is out of the predetermined threshold. If the same error code is set in the next driving cycle, the ECM/PCM illuminates the MIL.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Plausibility check during fuel cut off | 1. Poor connection or damaged harness 2. Front HO2S |
Enable Conditions |
•
Fuel cut off active
•
Sensor pump current valid (same as the conditions of P0133)
•
Sensor heater control: Normal heating 1)
•
Exhaust gas temperature model > 380°C
•
11V < Battery voltage < 16V | |
Threshold value |
•
2.1V <= Upstream O2 sensor voltage < 3.1V | |
Diagnosis Time |
•
6 sec. | |
MIL On Condition |
•
2 driving Cycles |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
