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. Poor Connector Connection 2. Open or Short to Battery in Control Circuit 3. Defected Upstream O2 Sensor |
Enable Conditions |
•
Upstream O2 Sensor heater PWM higher than 3.5% and lower than 96.5%
•
Exhaust gas Temp. lower than 572℉(300℃)
•
Battery voltage higher than 10 V and lower than 16 V
•
No relevant DTC present | |
Threshold Value |
•
Open or Short to Battery | |
Diagnostic Time |
•
Continuous | |
Mil On Condition |
•
2 Driving Cycle |
