If the sensor output signal is over 1.08 V under enable conditions, the PCM sets DTC P0138.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check, high. | 1. Poor connection 2. Open or short to power in signal circuit 3. HO2S(S2) |
Enable Conditions |
•
Battery voltage greater than 10.7 V.
•
Heat quantity from exhaust gas around downstream O2S greater than 1~312 kJ. | |
Threshold Value |
•
HO2S(S2) sensor voltage greater than 1.08 V. | |
Diagnostic Time |
•
2.5 sec. | |
Mil On Condition |
•
2 driving cycles. |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
