This DTC sets when the catalyst system efficiency is below the acceptable threshold.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Check Catalyst oxygen storage capacity | 1. Exhaust system 2. S2 3. Catalyst converter 4. Out of range ECT sensor 5. Exhaust manifold 6. High fuel pressure 7. Incorrect connection 8. Misfire 9. Injector 10. EGR system |
Enable Conditions |
•
Engine speed 1320~3000 rpm
•
Engine load 20~75 %
•
Catalyst temp.(model) 600~850 ℃(1112 ~1562 °F)
•
Fuel system status : Closed loop
•
Time after engine start > 260 sec
•
Delta temp of catalyst < 40 ℃(104 °F) | |
Threshold Value |
•
Ratio of Actual OSC to Model OSC < 1.0 | |
Diagnostic Time |
•
4 Cycles of Lambda Setpoint steps(Rich to Lean) | |
MIL ON Condition |
•
2 driving cycles |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
