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 Coolant Temperature(ECT) > 68°C
•
447°C < Catalyst temperature model < 927°C
•
Vehicle speed > 90km
•
1200rpm < Engine speed < 3300rpm
•
0.22g/rev < Mass air flow < 0.9g/rev
•
Ambient pressure (model) > 70kPa
•
Canister load < 0.5
•
Lambda control active and Lambda set-point = 1
•
Stable driving condition : abs(rpm - filtered rpm) < 320rpm & abs(air mass - filtered air mass) < 0.160g/rev & abs(lambda - filtered lambda) < 7%
•
Downstream O2 sensor operative readiness detected : [(Downstream O2 sensor Voltage < 0.25V or Downstream O2 sensor Voltage) > 0.56V & Downstream O2 sensor max heating finished 2)] or downstream exh. gas temp. model > 300°C
•
Downstream O2 sensor pre-heating phase finished 2)
•
No opening / closing of canister purge valve
•
11V < Battery voltage < 16V | |
Threshold Value |
•
Average malfunction index > 1 | |
Diagnostic Time |
•
25 Lambda Controller Cycles(SULEV) | |
MIL On Condition |
•
2 driving cycles |
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
