PCM sets DTC P0138 if the HO2S(B1S2) voltage remains excessively high for a pre-determined time.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical Monitoring | 1. Poor Connector Connection 2. Short to Battery in Downstream O2 Sensor Signal Circuit 3. Defected Downstream O2 Sensor |
Enable Conditions |
•
Battery voltage higher than 10 V and lower than 16 V
•
No relevant DTC present | |
Threshold Value |
•
Downstream O2 Sensor voltage higher than 1.2V | |
Diagnostic Time |
•
35 sec. | |
Mil On Condition |
•
2 Driving Cycle |
