When the ECM/PCM detects a short to ground in the HO2S(S1) heater control circuit , the ECM/PCM sets DTC P0031.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical check | 1. Poor connection 2. Short to ground in control circuit 3. HO2S(S1) |
Enable Conditions |
•
1.56% < Upstream O2 sensor heater PWM < 98.4%
•
Exhaust gas temperature model > 300°C
•
10V < Battery voltage < 16V | |
Threshold Value |
•
ECU power stage diagnosis | |
Diagnostic Time |
•
Continuous. | |
Mil On Condition |
•
2 driving cycles. |
