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 there is Short to power in ISCA(closing coil) circuit, PCM sets DTC P1508.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Circuit continuity check, high (closing coil)
? Poor connection
? Short to power in control circuit
? ISCA
? PCM
Enable Conditions
Threshold Value
? Shorted to battery voltage
Diagnostic Time
? Continuous
MIL ON Condition
? 2 driving cycle
Temperature(?)
Closing Coil Resistance (?)
Opening Coil Resistance (?)
20~35
15.4±0.8
11.9±0.8