The PCM sets DTC P050B when the difference between desired and commanded spark timing exceeds the calibrated threshold.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
MAX-Error of diagnosis of engine efficiency for catalyst heating during idle | 1. Intake air restriction 2. Exhaust restriction 3. Engine mechanical concern 4. Damaged or sludged throttle body 5. Vacuum leaks 6. Damaged PCM |
Enable Conditions |
•
After catalyst heating is active greater than 3sec
•
BARO greater than 74.5kPa(0.745bar/10.8psi)
•
Engine load less than 55%
•
Vehicle Speed 0mph
•
Time after engine start greater than 3sec
•
Catalyst heating active
•
Engine speed greater than 600rpm | |
Threshold value |
•
Average of spark efficiency deviation during 10sec(Difference of Actual efficiency and Target efficiency) greater than Threshold(ECT at Start)Ref.) Eng. Temp. at start -9.8°C(14.36°F) = Efficiency 0.5% Eng. Temp. at start 9.8°C(49.64°F) = Efficiency 0.5% Eng. Temp. at start 15°C(59°F) = Efficiency 0.5% Eng. Temp. at start 40°C(104°F) = Efficiency 0.5% | |
Diagnosis Time |
•
8 sec. | |
MIL On Condition |
•
2 driving cycles |
