PCM monitors output signals from the HO2S. If an output signal is above specified value for more than predetermined time, the PCM sets a P0138 DTC.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Monitor signal voltage | 1. Poor connection 2. Short to battery in harness 3. HO2S(B1/S2) 4. PCM |
Enable Conditions |
•
Battery voltage greater than 10V
•
Engine running longer than 60 sec.
•
Engine at operating temperature | |
Threshold value |
•
The voltage of HO2S(B1/S2) greater than 1.3V | |
Diagnosis Time |
•
Continuous (more than 12.5 sec. failure for every 15 sec.test) | |
MIL On Condition |
•
3 Driving Cycles |
