PCM monitors output signal from the HO2S under conditions for setting DTC. If the HO2S's signal is lean during power enrichment conditions, the PCM sets a P2197.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Monitor HO2S's signal | 1. Poor Connection 2. Faulty HO2S 3. Restricted of fuel filter in fuel pump 4. Faulty PCM |
Enable Conditions |
•
Battery voltage greater than 10V
•
Engine running longer than 60sec.
•
Power Enrichment mode
•
Engine at operating temperature
•
Not in Transient Conditions | |
Threshold value |
•
HO2S's signal less than 0.55V and Air Fuel Ratio less than 13.49 | |
Diagnosis Time |
•
Continuous (More than 8 sec. failure for every 9 sec. Test) | |
MIL On Condition |
•
3 Driving Cycles |
