The PCM sets DTC P050A when the difference between desired and actual engine speed exceeds the calibrated threshold.
Item | Detecting Condition | Possible Cause | |
Case 1 | DTC Strategy |
•
Engine speed is below the target while ISC torque is at the maximum during catalyst heating phase | 1. Intake air restriction 2. Exhaust restriction 3. Engine mechanical concern 4. Damaged or sludged throttle body 5. Vacuum leaks 6. Damaged PCM |
Threshold Value |
•
Difference of Desired engine speed and Engine speed greater than 100rpm | ||
Case 2 | DTC Strategy |
•
Engine speed is above the target while ISC torque is at the minimum during catalyst heating phase | |
Threshold Value |
•
Difference of Desired engine speed and Engine speed less than -200rpm | ||
Case 3 | DTC Strategy |
•
Fuel cut-off during stand-still, idle condition and catalyst heating phase | |
Threshold Value |
•
Fuel cut-off equal to to or greater than 3times | ||
Enable Condition |
•
Vehicle speed 0mph
•
ECT(Engine Coolant Temperature) at start greater than -10.5℃(13.1°F)
•
IAT(Intake Air Temperature) greater than -10.5℃(13.1°F)
•
Accel. pedal 0%
•
BARO greater than 74.5kPa(10.8psi/0.745bar)
•
Catalyst heating Active | ||
Diagnostic Time |
•
8 sec | ||
MIL ON Condition |
•
2 driving cycles | ||
