PCM sets DTC P0031 if the PCM detects that the front HO2S heater control circuit is short to ground.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical Check | 1. Related fuse blown or missing 2. Open or short to ground in power supply or control harness 3. Poor connection or damaged harness 4. Faulty HO2S |
Enable Conditions |
•
No relevant failure
•
10V< Battery voltage <16V
•
3.5%< O2 sensor heater control duty <96.5% | |
Threshold Value |
•
HO2S Heater Output < Lower Threshold | |
Diagnostic Time |
•
10sec. | |
Mil On Condition |
•
2 Drive Cycles |
