PCM monitors output signals from CMPS while engine is running. If the expected number of cam tooth counts is not observed, the PCM sets a P0391DTC.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Check if CAM sensor is synchronized correctly | 1. Poor connection 2. Short in harness 3. Electrical noise 4. Target wheel damage 5. CMPS(B2-Exhaust) 6. PCM |
Enable Conditions |
•
Engine running state | |
Threshold value |
•
Cam tooth count ≠ 6 | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
3 driving cycles |
