The IAC System is designed to maintain a steady desired idle speed. Idle airflow is adjustedthrough the idle air actuator, which may be ETC throttle body, in order to maintain the desired idle speed under various load conditions. Load conditions vary due to numerous factors, such as engine temperature, air conditioning, electrical load and power steering load.
Checking idle RPM under detecting condition, if if the idle speed is 100RPM below desired idle speed, PCM sets P0506. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till cosecutive 2 driving cycle.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Determines if a low idle condition exists. | ● Poor connection ● Intake/Exhaust system for blockage ● Throttle plate for carbon deposits ● Faulty ETS motor ● Faulty TPS ● Faulty ETS system ● Faulty PCM |
Enable Conditions | ● Normal Idle conditions ● Canister Purge Fuel Flow ≤ 100 ● Barometric Pressure > 72kPa ● Engine running ≥ 2 sec. ● Air Intake Temperature ≥ -20℃ (-4℉) ● Coolant Temperature ≥ 0℃ (32℉) ● 11V ≤ Ignition Voltage ≤ 16V ● Above conditions met period > 3 sec. | |
Threshold value | ● Real engine speed - Target engine speed< -100rpm | |
Diagnosis Time | ● Continuous | |
MIL On Condition | ● 2 driving cycles |
