PCM/ECM sets DTC P0131 if the HO2S(B1S1) voltage remains excessively low for a predetermined time.
The control unit of the linear oxygen sensor built inside the PCM/ECM monitors short circuit error on all front Heated Oxygen Sensor (HO2S) control lines (VRC, VIP, VG, VN) and PCM/ECM sets P0131 with short circuit to ground.If same code is set again in the next driving cycle, MIL is illuminated.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage range check | 1. Short to ground in signal harness 2. Poor connection or damaged harness 3. Faulty Heated O2 Sensor(HO2S) |
Enable Conditions |
•
Lambda close loop activated
•
Lambda controller on max. limit during 10 sec.
•
Canister purge valve closed
•
No relevant failure
•
10V< Battery voltage <16V | |
Threshold Value |
•
HO2S(B1S1) < 0.02V | |
Diagnostic Time |
•
60 sec. | |
Mil On Condition |
•
2 Driving Cycles |
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical check | 1. Short to ground in signal harness 2. Poor connection or damaged harness 3. Faulty Heated O2 Sensor(HO2S) |
Enable Conditions |
•
10V < Battery voltage < 16V
•
Ignition key On | |
Threshold Value |
•
Error bit information from HW circuit | |
Diagnostic Time |
•
0.5 Seconds | |
Mil On Condition |
•
2 Driving Cycles |
