If ECM/PCM detects short to B+ in signal circuit, ECM/PCM sets DTC P0138.
( This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first. )
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check, high | 1. Poor connection 2. Short to power in signal circuit 3. Downstream O2S |
Enable Conditions |
•
Battery voltage > 10.7V
•
Heat quantity from exhaust gas around downstream O2S > 1~312kJ | |
Threshold Value |
•
Downstream O2S voltage > 1.08V | |
Diagnosis Time |
•
- | |
Mil On Condition |
•
2 trips |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
