ECM/PCM assumes the power circuit is open and shows P2243 when upstream O2 sensor is lower than 0.2V or higher than 4.7V and internal resistance gets high.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Reference Voltage Circuit Open check | 1. Poor connection 2. Open or short power/ground in signal circuit 3. upstream O2S |
Enable Conditions |
•
Internal Resist Value > 950 Ω | |
Threshold Value |
•
Sensor voltage is higher than 4.7V or lower than 0.2V | |
Diagnostic Time |
•
Immediate | |
MIL ON Condition |
•
2 Driving Cycle |
