ECM/PCM sets DTC, If it detects imbalance of Air/Fuel correction in each cylinder.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Erratic Air/Fuel correction value | 1. Fuel leakage or stuck in injector 2. Air leakage in cylinder 3. Ignition system error in cylinder 4. Abnormal compression pressure in cylinder |
Enable Conditions |
•
70 ℃ < Engine coolant temperature < 105 ℃
•
500 ℃ < Catalyst temperature < 900 ℃
•
1520 < Engine RPM < 3000
•
33 % < Engine load < 60 %
•
BARO > 55 kPa
•
Engaged gear ≥ 4
•
Fuel system status : Closed loop
•
Time after engine start > 20 sec.
•
Rough roads must not be detected
•
No gear change takes place
•
Circuit Monitoring of Upstream O2S : Complete | |
Threshold value |
•
Cylinder #3 A/F deviation > 10%
•
Cylinder #3 A/F deviation < -10% | |
Diagnosis Time |
•
- | |
MIL On Condition |
•
2 trips |
