PCM/ECM sets DTC P0138 if the HO2S(B1S2) voltage remains excessively high for a predetermined time.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage range check(short circuit to battery) | 1. Short to Battery in signal harness 2. Poor connection or damaged harness 3. Faulty Heated O2 Sensor (HO2S) |
Enable Conditions |
•
10V< Battery voltage <16V | |
Threshold Value |
•
1.2V< HO2S(B1S2) | |
Diagnostic Time |
•
1sec. | |
Mil On Condition |
•
2 Drive Cycles |
