The ISCA (Idle Speed Control Actuator) is designed to maintain a steady desired idle speed. Idle airflow is adjusted through the idle air actuator 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.
If the real engine speed is higher than the desired engine speed over 200 rpm under enable conditions, PCM sets P0507.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Rationality check, high | ● Poor connection ● Leak in intake air system ● Carbon pile ● ISCA ● ECM |
General Enable Conditions | ● Vehicle speed = 0 ● Coolant temperature > 70℃ ● Intake air temperature > -7.5℃ ● Altitude < 3000m ● Idle status | |
Case 1 | Enable Conditions | ● Idle controller I part = -15% |
Threshold Value | ● Desired engine speed ? Engine speed < -200rpm | |
Case 2 | Threshold Value | ● Fuel cut-off ≥ 3times |
Diagnostic Time | ● 15 sec | |
MIL ON Condition | ● 3 driving cycle |
Temperature | Closing Coil Resistance (Ω) | Opening Coil Resistance (Ω) |
20~35℃(68~95℉) | 15.4±0.8 | 11.9±0.8 |
