ECU shows P050B when ignition retard doesn't work even if ETC would activate retard of ignition timing by throttle opening for catalyst heating.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
MAX-Error of diagnosis of engine efficiency for catalyst heating during idle | 1. Intake system for blockage |
Enable Conditions |
•
After catalyst heating is active > 3sec
•
BARO > 75 kPa
•
Engine load < 55%
•
Vehicle Speed = 0 mph
•
Time after engine start > 3sec
•
Catalyst heating is active
•
Engine speed > 600rpm | |
Threshold value |
•
Average of spark efficiency deviation during 10sec (Actual - Target efficiency) > Threshold f(ECT at Start) | |
Diagnosis Time |
•
8sec | |
MIL On Condition |
•
2 Drive Cycles |
