When engine is idling, the PCM adjusts the idle speed control actuator so that the engine runs at the correct idling speed, regardless of coolant temperature, load and etc.When the additional load applied in the engine, the air flow through the idle speed control actuator is increased momentarily to raise the idling speed.
The PCM monitors engine speed deviation from the target idle engine speed when the vehicle is stopped and the throttle valve opening is stable. The PCM sets DTC P0506 if the difference to the target idle engine speed is lower than the predetermined threshold.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Monitoring deviation between target idle speed and actual engine speed | 1. Restriction in intake or exhaust system 2. Contact resistance in connectors 3. Faulty ETC |
Enable Conditions |
•
Coolant temp. > 165℉
•
Time elapsed after ( pedal value = 0% and vehicle speed = 0mph)
•
Idle speed controller active(idle status)
•
11< Battery voltage <16
•
No relevant failure | |
Threshold Value |
•
Current RPM < Target RPM -100rpm Engine speed too Low | |
Diagnostic Time |
•
17 sec. | |
Mil On Condition |
•
2 driving cycle |
