The PCM assumes the power circuit is open and sets DTC P2243 when the upstream O2 sensor is lower than 0.2V or higher than 4.7V and the internal resistance gets high.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Reference Voltage Circuit Open | 1. Poor connection 2. Open or short power/ground in signal circuit 3. HO2S(S1) |
Enable Conditions |
•
Sensor voltage less than 0.2 V or greater than4.7 V | |
Threshold Value |
•
Internal resistance greater than 950 Ω | |
Diagnostic Time |
•
Immediate | |
MIL ON Condition |
•
2 Driving Cycle |
