ECM sets DTC P0031 if the ECM detects the front HO2S heater control circuit is shorted to ground.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Heater circuit monitoring | 1. Poor connector connection 2. Faulty related fuse 3. Open/short in power circuit 4. Short to ground in control circuit 5. Faulty upstream O2 sensor |
Enable Condition |
•
Ignition switch "ON"
•
Battery voltage is at between 10.7V and 16V | |
Threshold Value |
•
Short to ground | |
Diagnosis Time |
•
Continuous | |
MIL ON Condition |
•
3 driving cycles |
